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Hartmut Winkler: papers, articles and interviews On this page I list some of my personal details, and provide links to papers, articles and related material I have produced. Link to my Google Scholar profile Link to my Researchgate profile Link to my orcid profile (0000-0003-2662-0526) Go to my opinion pieces Go to a selection of my recorded media interviews and discussions Go to my refereed journal papers Go to my refereed conference proceedings papers Go to my other papers The five papers that I consider my most significant: Winkler et al. (1992) - Variability studies of Seyfert galaxies. I - Broad-band optical photometry Winkler (1997b) - The extinction, flux distribution and luminosity of Seyfert 1 nuclei derived from UBV(RI)C aperture photometry Winkler (1997a) - Red and infrared colours of B stars and the reddening law in the Galaxy Winkler et al (2008) - Evidence for large-scale transport of biomass burning aerosols from sunphotometry at a remote South African site Winkler (2022) - A revised simplified scattering model for the moonlit sky brightness profile based on photometry at SAAO I am also a contributor to the 2023 edition of the World Nuclear Industry Status Report Opinion pieces published in "The Conversation": South Africa's universities risk becoming bureaucratic degree factories (2 Nov 2015) Why South Africa should not build eight new nuclear power stations (5 Nov 2015) Explainer: South Africa's developing solar energy landscape (5 Jan 2016) Nuclear power in South Africa: ‘only on a scale and pace the country can afford’ (12 Feb 2016) How the state capture controversy has influenced South Africa's nuclear build (26 May 2016) Questions mount over South Africa's planned nuclear power deal (26 Sep 2016) South Africa's new energy plan has sparked strong emotions. Here's why (28 Nov 2016) Why Gordhan's silence on South Africa's nuclear options is a good sign (23 Feb 2017) Zuma's cabinet reshuffle opens the door for nuclear deal in South Africa (31 Mar 2017) No nuclear energy option for South Africa - for now at least (28 Apr 2017) The South African government hasn't given up the fight for nuclear (16 May 2017) Nuclear and coal lobbies threaten to scupper renewables in South Africa (26 Jun 2017) South African president's last ditch effort to ram through a nuclear power deal (9 Nov 2017) Why decommissioning South Africa's Koeberg nuclear plant won't be easy (25 Jan 2018) Why South Africa's power utility should boost its output of in-house renewables (2 Apr 2018) Why nuclear power for African countries doesn't make sense (15 May 2018) South Africa's new energy plan is imminent. What to look out for (19 Aug 2018) Key questions the Zondo inquiry needs to pose about the nuclear deal (28 Aug 2018) Why South Africa can't make a massive shift to renewables - yet (22 Oct 2018) Is South Africa on the cusp of a major shift in energy policy? (4 Feb 2019) South Africa's future energy mix: wind, solar and coal, but no nuclear (29 Oct 2019) Power shortages will remain a big challenge in a post-COVID-19 South Africa (20 Apr 2020) The case for turning South Africa's coal fields into a renewable energy hub (25 May 2020) Interpreting the South African government's mixed messages on nuclear power (1 Jul 2020) Why South Africa's electricity blackouts are set to continue for the next five years (30 Mar 2021) Why southern Africa's interior is an ideal place to generate solar energy (9 Jun 2021) South Africa's power generation plans are out of date: an urgent rethink is needed (6 Aug 2021) South Africa's efforts to tackle its energy crisis lack urgency and coherence (18 Feb 2022) Russia's nuclear power exports: will they stand the strain of the war in Ukraine? (6 Mar 2022) South Africa could produce a lot more renewable energy: here's what it needs (12 Jul 2022) South Africa's nuclear sector has failed its test: the Koeberg nuclear plant life extension (21 Aug 2022) South Africa is hooked on fossil fuels: how it got here and how it can get out (13 Nov 2022) Power cuts in South Africa: trend to get off the grid is gathering pace, but total independence is still a way off (20 Jan 2023) South Africa’s power outages could reach critical levels this winter - likely scenarios (18 Apr 2023) South Africa’s power crisis will continue until 2025 - and blackouts will take 5 years to phase out (7 Jun 2023) South Africa power outages: some improvement but a long way to go before the grid is stable (31 Oct 2023) 4 east African countries are going for nuclear power – why this is a bad idea (7 Dec 2023) South Africa’s new plan to end power cuts is seriously flawed. Here’s why (9 Jan 2024) South Africa’s electricity crisis: what political parties say in their election manifestos about solving it (9 Jan 2024) Opinion pieces published elsewhere: High time for Eskom and the energy sector to self-correct, lead editorial, Aug 2017 Ed., Energize magazine, EE publishers Nuclear power plans doomed, guest article in Saturday Star, 21 Oct 2017 A selection of recorded media interviews and discussions: Debate with Anthonie Cilliers on nuclear power, Robinson Regstreeks, Kyknet, 6 May 2016 Prof Hartmut Winkler: Energiesektor in SA, Die Groot Ontbyt, 16 Jan 2017 Prof. Winkler reacts to court's ruling on nuclear deal, SABC Channel 404, 26 Apr 2017 Will China Come to the Rescue of South Africa's Ailing Energy Giant Eskom?, China in Africa podcast, 21 Aug 2019 Analysis of Minister Gordhan's Eskom plans, SABC Channel 404, 29 Oct 2019 South Africa's future energy mix does not include nuclear, Radio 702, 30 Oct 2019 Eskom | The threat of power cuts looms large, e-News Channel Africa, 13 Jan 2020 Will loadshedding continue after lockdown?, Radio 702, 23 Apr 2020 Covid-19 could be catalyst to move away from coal and carbon emissions, Cape Talk, 27 May 2020 Eskom cannot cut electricity to struggling municipalities, Cape Talk, 14 Jan 2021 Should South Africans look for an alternative electricity source?, Newzroom Afrika, 7 Aug 2021 SA plunged into darkness as Eskom struggles to keep the lights on, Newzroom Afrika, 28 Oct 2021 Eskom ramps up load-shedding to Stage 4, Newzroom Afrika, 9 Nov 2021 SONA 2022 | Discussion | Major energy reforms announced, eNCA, 11 Feb 2022 Budget 2022 | Prospects for renewable energy in SA, eNCA, 23 Feb 2022 War in Ukraine | Russia's nuclear power exports, eNCA, 8 Mar 2022 Rolling Blackouts| Prof. Hartmut Winkler comments on Eskom's capacity to generate electricity, SABC Channel 404, 19 Apr 2022 100 days of load shedding ahead? Prof. Hartmut Winkler unpacks Eskom's challenges, Newsroom Afrika, 19 Apr 2022 Announcement of increase in electricity generation capacity: Prof. Hartmut Winkler, SABC Channel 404, 10 May 2022 Could renewable energy be the solution to the country's energy crisis?, Newzroom Afrika, 13 Jul 2022 Discussion | Extending Koeberg's lifespan, eNCA, 23 Aug 2022 Eskom's implementation of stage 4 rolling blackouts: Prof Hartmut Winkler, SABC Channel 404, 18 Oct 2022 Eskom's reasons for implementing Stage Six rolling blackouts: Prof. Hartmut Winkler, SABC Channel 404, 7 Dec 2022 Prof. Hartmut Winkler dissects SA's power crisis, Newzroom Afrika, 8 Dec 2022 Discussion | Eskom downgrades power cuts to Stage 5, eNCA, 9 Dec 2022 Phalatse asks Eskom to exclude Joburg metro from load-shedding for 3 days, Newzroom Afrika, 12 Dec 2022 Successful experiment could play way for abundant clean energy in future, Radio 702 Afternoon Show, 14 Dec 2022 Discussion | Eskom tariff increases, INX Prime, 13 Jan 2023 Energy crisis committee action plan, eNCA, 23 Jan 2023 Energy Crisis | Cool heads and workable plans needed to sort out blackouts: Prof. Hartmut Winkler, SABC Channel 404, 23 Jan 2023 Discussion | Winkler: Country has a long way to total independence from the grid, SABC Channel 404, 23 Jan 2023 Eskom media briefing, Cape Talk/702 Early Breakfast, 3 Feb 2023 SONA2023 | Reaction | State of Disaster declared on energy crisis, eNCA, 10 Feb 2023 SONA 2023 | SA's National State of Disaster to tackle energy crisis: Prof Hartmut Winkler, SABC Channel 404, 10 Feb 2023 Reaction: Eskom media briefing, Cape Talk/702 Early Breakfast, 21 Feb 2023 Discussion | Unpacking Eskom latest development, eNCA, 24 Feb 2023 Discussion | Are private power projects a solution to address blackouts?, eNCA, 3 Mar 2023 Ramokgopa's plans to end rolling blackouts: Prof Hartmut Winkler, SABC Channel 404, 10 Mar 2023 Future-Fit eCono-Me | Alternate Energy, eNCA "Future Imperfect", 13 Mar 2023 Discussion | Eskom grid failure, eNCA, 20 Apr 2023 Analyst: prepare for a possible complete grid collapse, Newzroom Afrika, 24 Apr 2023 PREVIEW | Pravin Gordhan's appearance at Scopa: Prof. Hartmut Winkler, SABC Channel 404, 26 Apr 2023 Prof. Hartmut Winkler: A complete grid collapse can't be ruled out, Newzroom Afrika, 27 Apr 2023 Hartmut Winkler, Professor of Physics at the University of Johannesburg says he believes that South Africans should prepare for another five years of load-shedding, Cape Talk/702 Early Breakfast, 29 May 2023 Winkler: It'll be hard to implement court ruling on loadshedding exemption, Newzroom Afrika, 7 May 2023 Government to appeal ruling on hospital exemption, eNCA, 8 May 2023 ANALYSIS: Is South Africa headed for a ‘black out’ similar to what Botswana experienced?, Cape Talk/702 Early Breakfast, 29 May 2023 Fears of total blackout in SA, Newzroom Afrika, 9 May 2023 Smart geyser usage, less load shedding?, Newzroom Afrika, 16 May 2023 Eskom denies country is heading toward complete grid collapse, Newzroom Afrika, 16 May 2023 Gordhan bemoans negative publicity amid De Ruyter's utterances, SABC Channel 404, 17 May 2023 Eskom reduces load shedding during the day; looks like there is light at the end of the tunnel, Cape Talk/702 Early Breakfast, 7 Jun 2023 Eskom launches first microgrid at Swartkopdam, Newzroom Afrika, 22 Jul 2023 Focus on government's Energy Action Plan with Hartmut Winkler, SABC Morning Live, 31 Jul 2023 Government scores itself 56% for the implementation of the energy action plan, Newzroom Afrika, 6 Aug 2023 Building an Inclusive World: BRICS summit spurs electricity collaboration talks, deals discussed on the sidelines, CGTN (China), 23 Aug 2023 Plans to help deal with energy crisis, eNCA, 24 Aug 2023 China gives SA R667m to deal with power crisis, eNCA, 28 Aug 2023 Blue super moon makes an appearance with Saturn peeping from behind, SABC Channel 404, 30 Aug 2023 Energy Crisis | Load shedding will be with us until the end of 2024: Prof Hartmut Winkler, SABC Channel 404, 5 Sep 2023 Eskom Investigation | Prof Hartmut Winkler weighs in on the matter, SABC Channel 404, 12 Sep 2023 ANALYSIS | Repurposing coal-fired power stations can be expensive: Prof Hartmut Winkler, SABC Channel 404, 19 Sep 2023 Low loadshedding this summer - Eskom, Newzroom Afrika, 27 Sep 2023 Eskom Board marks one year, SABC Channel 404, 1 Oct 2023 Eskom to announce 2023 annual results, SABC Morning Live, 31 Oct 2023 Alternating stage 1 and stage 2 blackouts underway, eNCA, 5 Nov 2023 No turf war over electricity provision, SABC Channel 404, 19 Nov 2023 Electricity Crisis | 'Load shedding will probably be with us for quite some time': Hartmut Winkler, SABC Channel 404, 25 Nov 2023 Ramokgopa's nuclear project will fail like Zuma's - Winkler, Newzroom Afrika, 12 Dec 2023 South Africa to build new nuclear plants: Professor Hartmut Winkler weighs in, SABC Channel 404, 12 Dec 2023 Prof Winkler weighs in on the the Electricity Regulation Amendment Bill in support of Eskom, SABC Channel 404, 9 Feb 2024 SA will have load shedding for the next 5 years - Winkler, Newzroom Afrika, 11 Feb 2024 Eskom to lower rolling blackout stages: Prof Hartmut Winkler, SABC Morning Live, 12 Feb 2024 Confidence expressed on new Eskom CEO - Professor Hartmut Winkler, SABC Channel 404, 11 Mar 2024 Prof. Hartmut Winkler looks at South Africa's electricity crisis, SABC Channel 404, 28 Mar 2024 Peter Higgs, SAFM The Jet Set Breakfast, 13 Apr 2024 A look at different political parties' electricity crisis solutions, Newzroom Afrika, 20 Apr 2024 Eskom praised for performance, Newzroom Afrika, 16 Jun 2024 New electricity and energy portfolio welcomed, Newzroom Afrika, 3 Jul 2024 Winkler: Billions needed to construct nuclear plant, Newzroom Afrika, 7 Jul 2024 Energy inequality in SA - Professor Hartmut Winkler shares thoughts, SABC Channel 404, 29 Jul 2024 Energy | Nuclear generation capacity plans postponed: Prof Hartmut Winkler weighs in, SABC Channel 404, 16 Aug 2024 List of publications [click on the code in the square brackets to access the paper] Refereed journal articles [1983-A1] - Winkler H, 1983: 'The spatial distribution of galaxies in the southern sky', Monthly Notices Astron. Soc. South Africa 42, 74-88 [1987-A1] - Menzies JW, Catchpole RM, Van Vuuren G, Winkler H, ... + 11 others ..., Wolstencroft R, 1987: 'Spectroscopic and photometric observations of SN 1987a: the first 50 days', Monthly Notices Roy. Astron. Soc. 227, 39P-49P [1987-A2] - Catchpole RC, Menzies JW, Monk AS, ... + 16 others ..., Winkler H, 1987: 'Spectroscopic and photometric observations of SN 1987a. Paper II: Days 51 to 134', Monthly Notices Roy. Astron. Soc. 229, 15P-25P [1988-A1] - Catchpole RM, Whitelock PA, Feast MW, ... + 19 others ..., Winkler H, ..., Parker QA, 1988: 'Spectroscopic and photometric observations of SN1987A ‑ III. Days 135 to 260', Monthly Notices Roy. Astron. Soc. 231, 75P-89P [1988-A2] - Whitelock PA, Catchpole RM, Menzies JW, ... + 16 others ..., Winkler H, ..., Van Wyk F, 1988: 'Spectroscopic and photometric observations of SN1987Aa ‑ IV. Days 260‑385', Monthly Notices Roy. Astron. Soc. 234, 5P-18P [1988-A3] - Winkler H, 1988: 'An investigation into the properties of a subgroup of southern galaxies detected by the IRAS survey', Monthly Notices Roy. Astron. Soc. 234, 703-711 [1989-A1] - Catchpole RM, Whitelock PA, Menzies JW, ... + 29 others ..., Winkler H, ..., Bromage G, 1989: 'Spectroscopic and photometric observations of SN1987A ‑ V. Days 386‑616', Monthly Notices Roy. Astron. Soc. 237, 55P-68P [1989-A2] - Winkler H, Wolf B, 1989: 'An analysis of high resolution spectra of the B[e]‑stars CPD ‑52°9243 and MWC 300', Astron. Astrophys. 219, 151-157 [1989-A3] - Whitelock PA, Catchpole RM, Menzies JW, ... + 20 others ..., Winkler H, ..., Moffat AFJ, 1989: 'Spectroscopic and photometric observations of SN1987A ‑ VI. Days 617 to 792', Monthly Notices Roy. Astron. Soc. 240, 7P-24P [1989-A4] - Sekiguchi K, Feast MW, Fairall AP, Winkler H, 1989: 'Spectral evolution of Nova Centauri 1986 (V842 Cen)', Monthly Notices Roy. Astron. Soc. 241, 311-323 [1989-A5] - Sekiguchi K, Kilkenny D, Winkler H, Doyle JG, 1989: 'Optical spectroscopy of Nova LMC 1988 no. 2 during its early decline stage', Monthly Notices Roy. Astron. Soc. 241, 827-837 [1990-A1] - Hutchinson MG, Evans A, Winkler H, Spencer Jones JH, 1990: 'Optical‑infrared photometry of the 'isolated' T Tauri star V4046 Sgr', Astron. Astrophys. 234, 230-232 [1991-A1] - O'Donoghue D, Chen A, Marang F, Mittaz J, Winkler H, Warner B, 1991: 'WX Cet and the WZ Sge stars', Monthly Notices Roy. Astron. Soc. 250, 363-372 [1992-A1] - Munari U, Yudin BF, Taranova OG, Massone G, Marang F, Roberts G, Winkler H, Whitelock PA, 1992: 'A catalogue of infrared observations of symbiotic stars', Astron. Astrophys. Suppl. 93, 383-390 [1992-A2] - Winkler H, Stirpe G, Sekiguchi K, 1992: 'The spectroscopic analysis of emission line galaxies discovered during an objective prism survey', Astron. Astrophys. Suppl. 94, 103-108 [1992-A3] - Winkler H, Glass IS, Van Wyk F, Marang F, Spencer Jones JH, Buckley DAH, Sekiguchi K, 1992: 'Variability studies of Seyfert galaxies. I ‑ Broad‑band optical photometry', Monthly Notices Roy. Astron. Soc. 257, 659-676 [1992-A4] - Winkler H, 1992: 'Variability studies of Seyfert galaxies. II ‑ Spectroscopy', Monthly Notices Roy. Astron. Soc. 257, 677-688 [1994-A1] - Stirpe GM, Winge C, Altieri B, ... + 46 others ..., Winkler H, ..., Santos-Lleo M, 1994: 'Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. VI. Variability of NGC 3783 from ground-based data', Astrophys. J. 425, 609-621 [1997-A1] - Winkler H, 1997: ‘Red and infrared colours of B-stars and the reddening law in the Galaxy’, Monthly Notices Roy. Astron. Soc., 287, 481-494 [1997-A2] - Winkler H, 1997: ‘The extinction, flux distribution and luminosity of Seyfert 1 nuclei derived from UBV(RI)c aperture photometry’, Monthly Notices Roy. Astron. Soc., 292, 273-288 [2001-A1] - Winkler H, 2001: ‘Studying the atmosphere over Africa using astronomical data: I - Extinction measurements’, African Skies 5, 10-12 [2001-A2] - Koen C, Kurtz DW, Gray RO, Kilkenny D, Handler G, Van Wyk F, Marang F, Winkler H, 2001: ‘UBVRIJH photometry of two new luminous d Scuti stars and the discovery of d Scuti pulsation in the most evolved star known’, Monthly Notices Roy. Astron. Soc. 326, 387-390 [2002-A1] - Formenti P, Winkler H, Fourie P, Piketh S, Makgopa B, Helas G, Andreae MO, 2002: ‘Aerosol optical depth over a remote semi-arid region of South Africa from spectral measurements of the daytime solar extinction and nighttime stellar extinction’, Atmospheric Research 62, 11-32 [2007-A1] - Cackett EM, Horne K, Winkler H, 2007: ‘Testing thermal reprocessing in active galactic nuclei accretion discs’, Monthly Notices Roy. Astron. Soc. 380, 669-682 [arXiv:0706.1464] [2008-A1] - Winkler H, Formenti P, Esterhuyse D, Swap RJ, Helas G, Annegarn HJ, Andreae MO, 2008: ‘Evidence for large scale transport of biomass burning aerosols from sunphotometry at a remote South African site’, Atmos. Env. 42, 5569-5578 [2011-A1] - Worobiec A, Potgieter-Vermaak S, Berghmans P, Winkler H, Burger R, Van Grieken R, 2011: ‘Air particulate emissions in developing countries: a case study in South Africa’, Analytical Letters 44, 1907-1924 [2013-A1] - Telsnig T, Eltrop L, Winkler H, Fahl U, 2013: ‘Efficiency and costs of different concentrated solar power plant configurations for sites in Gauteng and the Northern Cape, South Africa’. Journal of Energy in Southern Africa 24, 77-89 [2015-A1] - Valenti S, Sand DJ, Barth AJ, ... + 9 others ..., Winkler H, 2015: ‘Robotic reverberation mapping of Arp 151’, Astrophys. J. Lett. 813, L36 [arXiv astro-ph 1510.07329] [2016-A1] - Asabere BD, Horellou C, Jarrett T, Winkler H, 2016: ‘Mid-infrared dust in two nearby radio galaxies, NGC 1316 (Fornax A) and NGC 612 (PKS 0131–36)’, Astron. Astrophys. 592, A20 [arXiv astro-ph 1605.07565] [2017-A1] - Edelson R, Gelbord J, Cackett E, … + 39 others …, Winkler H, Zheng W, 2017: ‘SWIFT monitoring of NGC 4151: Evidence for a second x-ray/UV reprocessing’, Astrophys. J. 840, A41 [arXiv astro-ph 1703.06901] [2017-A2] - Fausnaugh MM, Grier CJ, Bentz MC, … + 66 others …, Winkler H, Zhu W, 2017: ‘Reverberation mapping of optical emission lines in five active galaxies’, Astrophys. J. 840, A97 [arXiv astro-ph 1610.00008] [2018-A1] - Fausnaugh MM, Starkey D, Horne K, … + 68 others …, Winkler H, Zhu W, 2018: ‘Continuum reverberation mapping of the accretion disks in two Seyfert 1 galaxies’, Astrophys. J. 854, A107 [arXiv astro-ph 1801.09692] [2018-A2] - Masok FB, Masiteng PL, Mavunda RD, Maleka PP, Winkler H, 2018: ‘Measurement of radioactivity concentration in soil samples around phosphate rock storage facility in Richards Bay, South Africa’, J. Rad. Res. Appl. Sci. 11, 29 [2018-A3] - Pancoast A, Barth AJ, Horne K, …+ 23 others …, Winkler H, 2018: ‘Stability of the broad line region geometry and dynamics in Arp 151 over seven years’, Astrophys. J. 856, A108 [arXiv astro-ph 1803.02318] [2018-A4] - De Rosa G, Fausnaugh MM, Grier CJ, … + 97 others …, Winkler H, …, Zu Y, 2018: ‘Velocity-resolved reverberation mapping of five bright Seyfert 1 galaxies’, Astrophys. J. 866, A133 [arXiv astro-ph 1807.04784] [2019-A1] - Oknyansky VL, Winkler H, Tsygankov SS, Lipunov VM, Gorbovskoy ES, Van Wyk F, Buckley DAH, Tyurina NV, 2019: ‘New changing look case in NGC 1566’, Monthly Notices Roy. Astron. Soc. 483, 558 [arXiv astro-ph 1811.06926] [2019-A2] - Li YR, Wang JM, Zhang ZX, … + 14 others …, Winkler H, …, 2019: ‘A possible ~20 year periodicity in long-term optical photometric and spectral variations of the nearby radio-quiet active galactic nucleus Ark 120’, Astrophys. J. Suppl. 241, A33 [arXiv astro-ph 1705.07781] [2019-A3] - Crause LA, Gilbank D, van Gend C, … + 17 others …, Winkler H, …, 2019: ‘SpUpNIC (Spectrograph Upgrade: Newly Improved Cassegrain), a versatile and efficient low- to medium-resolution long-slit spectrograph on the South African Astronomical Observatory’s 1.9-m telescope’, J. Astron. Tel. Instr. Sys. 5(2), 024007 [2019-A4] - Landt H, Ward MJ, Kynoch D, … + 15 others … Winkler H, 2019: ‘The first spectroscopic dust reverberation programme on active galactic nuclei: the torus in NGC 5548’, Monthly Notices Roy. Astron. Soc. 489, 1572 [arXiv astro-ph 1908.01627] [2020-A1] - Hu C, Li YR, Du P, … + 11 others …, Winkler H, …, 2020: ‘Broad-line region of the quasar PG 2130+099 from a two-year reverberation mapping campaign with high cadence’, Astrophys. J. 890, A70 [arXiv astro-ph 2001.03086] [2020-A2] - Hlabathe M, Starkey DA, Horne K, ... + 9 others ..., Winkler H, ..., 2020: 'Robotic reverberation mapping of the broad line radio galaxy 3C 120', Monthly Notices Roy. Astron. Soc. 497, 2910 [arXiv astro-ph 2007.11522] [2020-A3] - Oknyansky V, Winkler H, Tsygankov SS, Lipunov VM, Gorbovskoy ES, Van Wyk F, Buckley DAH, Jiang BW, Tyurina NV, 2020: 'The post-maximum behaviour of the changing look Seyfert galaxy NGC 1566', Monthly Notices Roy. Astron. Soc. 498, 718 [arXiv astro-ph 2006.00001] [2020-A4] - Hu C, Li SS, Guo WJ, … + 15 others …, Winkler H, Wang JM, 2020: ‘Evidence for two distinct broad-line regions from reverberation mapping of PG 0026+129’, Astrophys. J. 905, A75 [2021-A1] - Hu C, Li SS, Guo WJ, … + 13 others …, Winkler H, Wang JM, 2021: ‘Reverberation mapping results for 15 PG quasars from a long-duration high-cadence campaign’, Astrophys. J. Suppl. 253, A20 [2022-A1] - Kramers JD, Belyanin GA, Przybyłowicz WJ, Winkler H, Andreoli MAG, 2022: ‘The chemistry of the extraterrestrial carbonaceous stone “Hypatia”: a perspective on dust heterogeneity in interstellar space’, Icarus 382, 115043 [2022-A2] - Winkler H, 2022: ‘A revised simplified scattering model for the moonlit sky brightness profile based on photometry at SAAO’, Monthly Notices Roy. Astron. Soc. 514, 208 [arXiv astro-ph 2205.07773] [2022-A3] - Bao DW, Brotherton MS, Du P, … + 33 others …, Winkler H, …, 2022: ‘Monitoring AGNs with H-beta asymmetry. III. Long-term reverberation mapping results of 15 Palomar-Green quasars’, Astrophys. J Suppl. 262, A14 [arXiv astro-ph 2207.00297] [2022-A4] - Paul B, Winkler H, Potter SB, 2022: ‘The analysis of the iron-rich spectra of a sample of Narrow-line Seyfert 1 galaxies’, Monthly Notices Roy. Astron. Soc. 516, 2374 [2023-A1] - Kollatschny W, Grupe D, Parker ML, … + 7 others …, Winkler H, …, 2023: ‘The outburst of the changing-look AGN IRAS 23226-3843 in 2019’, Astron. Astrophys. 670, A103 [2023-A2] - Landt H, Mitchell JAJ, Ward MJ, … + 8 others …, Winkler H, 2023: ‘A complex dust morphology in the high-luminosity AGN Mrk 876’, Astrophys. J. 945, A62 [2023-A3] - Miller JA, Cackett EM, Goad MR, … + 8 others …, Winkler H, 2023: ‘Continuum reverberation mapping of Mrk 876. Over three years with remote robotic observatories’, Astrophys. J. 953, A137 [2024-A1] - Mitchell JAJ, Ward MJ, Kynoch D, … + 11 others …, Winkler H, 2023: ‘The first spectroscopic IR reverberation programme on Mrk 509’, Monthly Notices Roy. Astron. Soc. 529, 4824 [2024-A2] - Markowitz A, Krumpe M, Homan D, … + 12 others …, Winkler H, 2023: ‘A complex dust morphology in the high-luminosity AGN Mrk 876’, Astron. Astrophys. 684, A101 Papers in conference proceedings [1984-C1] - Fairall AP, Winkler H, 1984: ‘The spatial distribution of galaxies in the southern sky’, in Clusters and Groups of Galaxies, Astrophysics and Space Science Library, Vol 111, 23-28. F Mardirossian, G Giurcin & M Mezzetti (eds), D Reidel Publishing Company [1992-C1] - Winkler H, Glass IS, 1992: ‘Determining the extinction, luminosity and flux distribution of Seyfert galaxies using broad-band photometry’, in ‘Physics of Active Galactic Nuclei’, Proceedings of the Heidelberg conference, 3-7 June 1991, 267-269 [1996-C1] - Winkler H, 1996: ‘Astronomical data as a means to study air pollution’, Conference Proceedings, National Association for Clean Air 1996 Annual Conference, Badplaas, Mpumalanga [2001-C1] - Sefako RR, De Jager OC, Winkler H, 2001: ‘UBVRI photometry of southern sky BL Lacs’, in High Energy Gamma-Ray Astronomy International Symposium, 26-30 June 2000, Heidelberg, Germany, AIP Proceedings 558, Aharonian FA & Völk HJ (Eds), ISBN 1-56396-990-4, 732 [arXiv:astro-ph/0010263] [2011-C1] - Winkler H, 2011: ‘The unusual Seyfert Markarian 926 - a link to the LINERs?’, Proceedings of the South African Institute of Physics 56th annual conference, 12-15 July 2011, Pretoria, 567-572 [2011-C2] - Sethabane T, Winkler H, 2011: ‘Atmospheric turbidity over Soweto’, Proceedings of the South African Institute of Physics 56th annual conference, 12-15 July 2011, Pretoria, 525-530 [2012-C1] - Winkler H, 2012: ‘Properties of sub-classes identified in the Seyfert atlas project’, MEARIM, Cape Town, African Skies 16, 59 [2012-C2] - Winkler H, 2012: ‘The impact of aerosols on solar radiation: South African case studies’, South African Solar Energy Conference, Stellenbosch, 21-23 May 2012 [2012-C3] - Telsnig T, Eltrop L, Winkler H, 2012: ‘Efficiency and costs of different concentrated solar power plant configurations for sites in Gauteng and the Northern Cape, South Africa’ South African Solar Energy Conference, Stellenbosch, 21-23 May 2012 [2012-C4] - Winkler H, Franke B, Eltrop L, Telsnig T, 2012: ‘How applicable are standard solar irradiation maps? Insights from case studies’, EuroSun2012 conference, Rijeka, Croatia, Croatian Solar Energy Association & International Solar Energy Society, ISBN 978-953-6886-20-3 [2014-C1] - Winkler H, 2014: ‘A spectral re-examination of the Markarian AGN’, IAU Symposium 304, Oct 2013, Yerevan, Armenia, Proceedings of the International Astronomical Union 9, S304, 28-31, Cambridge University Press, AM Mickaelian & DB Sanders (Eds.) [2014-C2] - Asabere B, Horrelou C, Winkler H, Jarrett T, Leeuw L, 2014: ‘Dust in the radio galaxy and merger remnant NGC 1316 (Fornax A)’, Proceedings of the South African Institute of Physics 58th annual conference, 8-12 Jul 2013, Richards Bay, 344-349 [arXiv:1409.2474] [2014-C3] - Rahman N, Winkler H, 2014, ‘SDSS J12002-0204: Unusual I Zw 1 object or a nearby BAL Seyfert?’, Proceedings of the South African Institute of Physics 58th annual conference, 8-12 Jul 2013, Richards Bay, 368-373 [2014-C4] - Winkler H, 2014: ‘Line, LINER, linest - from micro-AGN to ultra-luminous LINERs. One and the same?’, Proceedings of the South African Institute of Physics 58th annual conference, 8-12 Jul 2013, Richards Bay, in 391-396 [arXiv:1409.2966] [2014-C5] - Winkler H, van Wyk F, Marang F, 2014: ‘South African night sky brightness during high aerosol epochs’, Proceedings of the South African Institute of Physics 58th annual conference, 8-12 Jul 2013, Richards Bay, 513-518 [arXiv:1409.2996] [2014-C6] - Winkler H, Chauke T, 2014: ‘Seyfert 2 galaxies with unusually wide nebular lines’, Proceedings of the South African Institute of Physics 57th annual conference, 9-13 Jul 2012, Pretoria, 386-391 [arXiv: 1412.4498] [2014-C7] - Molefe P, Sondezi BM, Winkler H, 2014: ‘How much do first year physics students really understand? An entry-level test’, Proceedings of the South African Institute of Physics 57th annual conference, 9-13 Jul 2012, Pretoria, 428-433 [2015-C1] - Asabere BD, Gaylard MJ, Horrelou C, Winkler H, Jarrett T, 2015, ‘Radio astronomy in Africa: the case of Ghana’, Proceedings of the South African Institute of Physics 59th annual conference, Jul 7-11 2014, Johannesburg, 296-301 [arXiv 1503.08850] [2015-C2] - Cyulinyana MC, Winkler H, 2015, ‘Reproducing observed solar radiation characteristics in Rwanda using theoretical models’, Proceedings of the South African Institute of Physics 59th annual conference, 7-11 Jul 2014, Johannesburg, 491-496 [2015-C3] - Webber G, Winkler H, 2015: ‘Calculating solar irradiance to determine yield from solar cells for De Aar’, Proceedings of the South African Institute of Physics 59th annual conference, 7-11 Jul 2014, Johannesburg, 546-550 [2015-C4] - Winkler H, Tsuen J, 2015: ‘Spectral comparison between AGN at z = 0.1, 0.2 and 0.3’, Proceedings of the South African Institute of Physics 59th annual conference, 7-11 Jul 2014, Johannesburg, 400-403 [arXiv 1503.06985] [2016-C1] - Cyulinyana MC, Winkler H, 2016: ‘Monte Carlo based estimation of the effect of different aerosol classes on solar irradiance in African atmospheric conditions’, Proceedings of the South African Institute of Physics 60th annual conference, 29 Jun-3 Jul 2015, Port Elizabeth, 404-409 [2016-C2] - Webber G, Winkler H, 2016: ‘Determining the effect of the solar cell band gap on power yield in southern African irradiance conditions’, Proceedings of the South African Institute of Physics 60th annual conference, 29 Jun-3 Jul 2015, Port Elizabeth, Annexure 36-41 [2016-C3] - Winkler H, 2016: ‘The unusually strong coronal emission lines of SDSS J1055+5637’, Proceedings of the South African Institute of Physics 60th annual conference, 29 Jun-3 Jul 2015, Port Elizabeth, 366-371 [arXiv 1604.04515] [2017-C1] - Winkler H, 2017: ‘How local conditions affect solar irradiance and photovoltaic module performance in South Africa’, Proceedings of the South African Institute of Physics 61th annual conference, 4-8 Jul 2016, Cape Town, 439-444 [2017-C2] - Winkler H, Paul B, 2017: ‘Analysis of the rich optical iron-line spectrum of the x-ray variable I Zw 1 AGN 1H0707-495’, Proceedings of the South African Institute of Physics 61th annual conference, 4-8 Jul 2016, Cape Town, 307-311 [arXiv 1708.02056] [2017-C3] - Cyulinyana MC, Winkler H, 2017: ‘Surface Solar Spectrum Characteristics in Tropical Regions with Specific Reference to Rwanda’, Proceedings of the 9th International Conference on Applied Energy, Aug 21-24 2017, Cardiff, UK, Energy Procedia 142, 545-551 [2018-C1] - Paul B, Winkler H, Potter SB, 2018: ‘Comparison of the rich optical FeII line spectra of selected I Zw 1 type objects from two epochs’, Proceedings of the conference “Revisiting narrow-line Seyfert 1 galaxies and their place in the universe”, 9-13 Apr 2018, Padova, Italy, Proceedings of Science PoS(NLS1-2018)048 [2018-C2] - Winkler H, 2018: ‘The suitability of clear sky diffuse irradiance models for South African atmospheric conditions’, Proceedings of the 5th South African Solar Energy Conference (SASEC 2018), 25-27 Jul 2018, Durban, paper 64 [2018-C3] - Winkler H, 2018: ‘Some things change, some don't. An exploration of Seyfert galaxy luminosity changes over a generation’, Proceedings of HEASA 2017, 4-6 Oct 2017, Johannesburg, Proceedings of Science PoS(HEASA2017)011 [2018-C4] - Cyulinyana MC, Winkler H, 2018: ‘Simulation of ground level spectral solar irradiance in Rwanda using LibRadtran’, Proceedings of the South African Institute of Physics 62nd annual conference, 3-7 Jul 2017, Stellenbosch, 312-317 [2018-C5] - Mabhengu T, Cyulinyana MC, Winkler H, 2018: ‘Testing the scattering distribution of a photon in a turbid medium using Monte Carlo simulations’, Proceedings of the South African Institute of Physics 62nd annual conference, 3-7 Jul 2017, Stellenbosch, 331-336 [2018-C6] - Masok FB, Masiteng LP, Mavunda RD, Maleka P, Winkler H, 2018: ‘Assessing the impact of rock phosphate storage on uranium and thorium concentration in soil samples from Richards Bay using neutron activation analysis’, Proceedings of the South African Institute of Physics 62nd annual conference, 3-7 Jul 2017, Stellenbosch, 158-163 [2018-C7] - Nethwadzi LC, Winkler H, 2018: ‘Calculation of direct and diffuse solar irradiance components using the Slob Algorithm model in Gauteng conditions’, Proceedings of the South African Institute of Physics 62nd annual conference, 3-7 Jul 2017, Stellenbosch, 361-366 [2019-C1] - Winkler H, 2019: ‘The intrinsic nuclear luminosities of a new sample of medium-distance Seyfert galaxies’, Proceedings of HEASA 2018, 1-3 Aug 2018, Parys, South Africa, Proceedings of Science PoS(HEASA2018)015 [2019-C2] - Oknyansky VL, Winkler H, Tsygankov SS, Lipunov VM, Gorbovskoy ES, Van Wyk F, Buckley DAH, Tyurina NV, 2019: ‘Discovery of more changing look events in NGC 1566’, 6th Gamow International Conference, 12-16 Aug 2019, Odessa, Ukraine, Odessa Astronomical Publications 32, 75 [2019-C3] - Fourie CH, Winkler H, Roro K, 2019: ‘Modelling atmospheric radiative transfer conditions and its comparison to empirical solar irradiance in South Africa’, SASEC 2019, 25-27 Nov 2019, Mpekweni, 6th South African Solar Energy Conference (SASEC 2019) proceedings, paper ID 7 [2019-C4] - Javu L, Winkler H, Roro K, 2019: ‘Validating clear-sky irradiance models in 5 South African locations’, SASEC 2019, 25-27 Nov 2019, Mpekweni, 6th South African Solar Energy Conference (SASEC 2019) proceedings, paper ID 6 [2019-C5] - Winkler H, 2019: ‘The daily and seasonal dependence of the solar field of South Africa's operating solar power plants’, accepted for Proceedings of SASEC 2019, 25-27 Nov 2019, Mpekweni, 6th South African Solar Energy Conference (SASEC 2019) proceedings, paper ID 5 [2020-C1] - Makope DTM, Winkler H, van Wyk F, 2020: ‘The optical and X-ray properties of a sample of Seyfert galaxies that have undergone significant spectral change’, HEASA 2019, 28-30 Aug 2019, Swakopmund, Namibia, Proceedings of Science PoS(HEASA2019)030 [2020-C2] - Paul B, Winkler H, Potter SB, 2020: ‘Analysis if optical FeII emission in connection with the X-ray properties of a selected sample of IZw1 type objects’, HEASA 2019, 28-30 Aug 2019, Swakopmund, Namibia, Proceedings of Science PoS(HEASA2019)031 [2020-C3] - Winkler H, Moeng AMA, 2020: ‘New insights from early spectra of the bright Nova Vela 1999’, HEASA 2019, 28-30 Aug 2019, Swakopmund, Namibia, Proceedings of Science PoS(HEASA2019)020 [2021-C1] - Winkler H, 2020: ‘Revisiting old (AGN) friends - what's changed in their spectral looks’, Proceedings of IAU Symposium 356, Oct 2019, Addis Ababa, Ethiopia, Proceedings of the International Astronomical Union 9, S356, 122-126 [arXiv astro-ph 2001.04681] [2021-C2] - Moeng AMA, Winkler H, van Wyk F, 2021: ‘RXS J08182+0122 - an AGN with an unusually broad Keplerian rotator line profile’, HEASA 2021, 13-17 Sep 2021, Online, Proceedings of Science POS(HEASA2021)013 [2022-C1] - Fourie CH, Winkler H, Roro K, 2022: ‘Solar irradiance in Gauteng during the 2020 COVID-19 lock-down - can we detect decreased aerosol loading?’, Proceedings of the South African Institute of Physics 65th annual conference, 26-30 Jul 2021, North West University (online), 548-553 [2022-C2] - Paul B, Winkler H, Potter SB, 2022: ‘Optical emission line properties of some little-known Narrow Line Seyfert 1 galaxies’, Proceedings of the South African Institute of Physics 65th annual conference, 26-30 Jul 2021, North West University (online), 345-351 [2023-C1] - Winkler H, Kadiaka T, van Wyk F, 2023: ‘1E 0502-667: An AGN without narrow lines?’, HEASA 2022, 28-30 Sep 2022, Amanzi Game Reserve, Bloemfontein, Proceedings of Science POS(HEASA2022)035 [2023-C2] - Figlan SM, Winkler H, 2023: ‘Testing basic solar irradiance models on measurements at Southern African localities’, SASEC 2023, 15-17 Nov 2023, Gqeberha, South African Sustainable Energy Conference (SASEC 2023) proceedings, p. 92 [2023-C3] - Winkler H, 2023: ‘The recent accelerated pace of rooftop solar installations in South Africa’, SASEC 2023, 15-17 Nov 2023, Gqeberha, South African Sustainable Energy Conference (SASEC 2023) proceedings, p. 7 [2024-C1] - Winkler H, Morgan DT, van Wyk F, 2023: ‘Photometry of blazars using the Las Cumbres Observatory robotic telescope network’, HEASA 2023, 5-39 Sep 2023, Mtunzini, Proceedings of Science POS(HEASA2023)007 Scientific articles in other journals (not peer-reviewed) [1989-D1] - Winkler H, 1989: ‘Photometric observations of bright stars in the vicinity of Seyfert galaxies (I)’, SAAO Circ. 13, 63-68 [1990-D1] - Winkler H, Payne P, 1990: ‘UBVRI aperture photometry of southern Seyfert galaxies and related objects’, SAAO Circ. 14, 21-24 [1990-D2] - Winkler H, Van Wyk F, Glass IS, 1990: ‘Photometric observations of bright stars in the vicinity of Seyfert galaxies (II)’, SAAO Circ. 14, 25-31 [1993-D1] - Kilkenny D, Barrett PE, Marang F, Van Wyk F, Roberts G, Winkler H, 1993: ‘UBV photometry of HD stars in the fields of selected cataclysmic variables’, SAAO Circ. 15, 78-84 [1993-D2] - Kilkenny D, Van Wyk F, Marang F, Roberts G, Laing JD, Winkler H, Westerhuys JE, 1993: ‘UBVRI photometry of the Type II Cepheid ST Pup’, SAAO Circ. 15, 85-89 [1993-D3] - Winkler H, Catchpole RM, Mustapha N, 1993: ‘Spectroscopy of Nova Sagittarii 1987’, SAAO Circ. 15, 103-105 [1993-D4] - Winkler H, 1993: ‘Observations of galaxies with starlike nuclei’, SAAO Circ. 15, 106-107 [2000-D1] - Sefako RR, De Jager OC, Van der Walt DJ, Winkler H, 2000: ‘Limits on magnetic field strength of the extended nebula PSR B1706-44 from optical, x-ray and TeV observations’ [arXiv:astro-ph0003449] |