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
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 (1992) - Variability studies of Seyfert galaxies. II - Spectroscopy
Winkler et al (2008) - Evidence for large-scale transport of biomass burning aerosols from sunphotometry at a remote South African site


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)


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


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, …, 2019: ‘Broad-line region of the quasar PG 2130+099 from a two-year reverberation mapping campaign with high cadence’, Astrophys. J., in press [arXiv astro-ph 2001.03086]


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, https://www.sasec.org.za/documents/SASEC2018_programme_full_papers.pdf
[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


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]

 

 

  Site Map