Publications
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Publications are sorted according the year published, under the following categories:
Journal and written Publications
2003
Cilliers, P.J., Gouws, D., Opperman, B., Wonnacott, R.T., Combrinck, W.L. (2003), “The South African network of dual-frequency global positioning system satellite receiver base stations: a national asset with many applications and research opportunities”, South African Journal of Science, 99 : p. 51-55
Ferreira, S.E.S., Potgieter, M.S., Moeketsi, D.M., Heber, B., Fichtner, H. (2003), “Solar wind effects on the transport of 3-10 MeV cosmic-ray electrons from solar minimum to solar maximum”, Astrophysical Journal, 594 : p. 552
Ferreira, S.E.S., Potgieter, M.S., Moeketsi, D.M. (2003), “Modulation effects of a changing solar wind speed on low-energy electrons”, Advances in Space Research, 32 (4) : p. 675-680
Combrinck, L.,Merry, C.L., Wonnacott, R.T. (07/2003), “South African research in geodesy: 1999-2003”, South African Journal of Science, 99 : p. 398-400
Combrinck, L.W., Combrink, A.(2003), “Applications of tropospheric parameters derived using the SADC GPS network”, URSI Conference proceeding.
Combrinck, L. (2003), “Inkaba ye Africa – Geodesy projects – funding initiative in Africa from Germany”, (Publication detail unknown)
Fernandes, R.M.S., Combrinck, W.L., Ambrosius, B.A.C., Noomen, R., Bastos, L.,Spakman, W., Sucure, J. (2003), “Geodynamics of Africa from continuous GPS data: analyses and implications”, EGS-AGU-EUG joint assembly, abstract : 7725
Combrinck, W.L. (2003), “Hartebeesthoek Radio Astronomy Observatory”,International VLBI service for geodesy and astrometry (IVS) : 2003 annual report / eds. Van den berg, N.R., Baver, K.D. p. 41-44
2004
Fernandes, R.M.S., Ambrosius, B.A.C., Noomen, R., Bastos, L., Combrinck, W.L., Miranda, J.M., Spakman, W. (2004), “Angular velocities of Nubia and Somalia from continuous GPS data: implications on present-day relative kinematics”, Earth and Planetary Science Letters, 222 : p. 197-208
Combrink, A.Z.A., Combrinck, W.L., Moraal, H. (2004), “Near real-time detection of atmospheric water vapour using the SADC GPS network”, South African Journal of Science, 100 : p. 436
Henize, V.K., Potgieter, M.S., Ferreira, S.E.S., Moeketsi, D.M., Heber, B. (2004), "Causes of a few-MeV electron variations during solar maximum”, 35th COSPAR Scientific Assembly. Held 18 - 25 July 2004, in Paris, France., p.904
Heber, B., Ferreira, S.E.S., Fichtner, H., Potgieter, M.S., Henize, V.K., Kissmann, R., Moeketsi, D.M. (2004), “Out-of-ecliptic quiet time MeV electron increases: Ulysses COSPIN/KET observations”, Plasmas in the laboratory and in the universe: new insights and new challenges. AIP Conference proceedings, 703 : p. 157-160
Combrink, A.Z.A., Combrinck, W.L.(2004), “The impact of a permanent dual-frequency GPS receiver at Marion Island on atmospheric remote sensing data”, 35th COSPAR Scientific Assembly. Held 18 - 25 July 2004, in Paris, France., p. 337
Combrinck, W.L., Combrink, A.Z.A.(2004), “Proposed new international space geodesy facility for Southern Africa”, 35th COSPAR Scientific Assembly. Held 18 - 25 July 2004, in Paris, France., p. 270
2005
Moeketsi, D.M., Potgieter, M.S., Ferreira, S.E.S., Heber, B., Fichtner, H., Henize, V.K., “The heliospheric modulation of 3-10 MeV electrons: modeling of changes in the solar wind speed in relation to perpendicular polar diffusion”, Advances in Space Research, 35 : p. 597-604
Moeketsi, D.M., Combrinck, W.L., McKinnell, L.A., Fedrizzi, M. (12/2005), “Solar cycle variations of GPS-derived total electron content observed over Southern Africa”, Advances in Space Research (in press)
Ngcobo, S., Moeketsi, D.M., Combrink, A.Z.A., Combrinck, W.L. (2005), “Ionospheric total electron content observed using the southern African GPS networks”, South African Journal of Science, 101 : p.537-539
Combrinck, W.L., Bernhardt, J.(2005), “Hartebeesthoek, South Africa (Station report)”, International Lase Ranging Service 2003-2004 Annual Report / eds. Pearlman, M., Noll, C. p.A-43 – A-46
2006
Madiseng, S.S.S., Webb, S., Combrinck, W.L. (2006), “Testing of geodetic and geophysical parameters on potential sites for space geodesy observations”, SAGA Newsletter, (no.?)
Moeketsi, D.M., McKinnell, L.A., Combrinck, W.L. (2006), “Comparison of GPS and ionosonde TEC measurements over South Africa during the descending phase of solar cycle 23” 36th COSPAR Scientific Assembly. Held 16 - 23 July 2004, in Beijing, China., p.1755
Combrink, A.Z.A., Combrinck, W.L., Merry, C.L. (2006), “The improvement of GPS-derived PWV accuracies using solid earth tide models based on local measurements”, 36th COSPAR Scientific Assembly. Held 16 - 23 July 2004, in Beijing, China., p. 920
Combrinck, W.L., Nickola, M. (2006), “Hartebeesthoek Radio Astronomy Observatory (HartRAO)”, IVS 2006 Annual Report, p. 44-47
2007
Moeketsi, D.M., Combrinck, W.L., McKinnell, L.A., Fedrizzi, M. (2007), “Mapping GPS-derived ionospheric total electron content over Southern Africa during different epochs of solar cycle 23”, Advances in Space Research, 39 : p. 821-829
Combrinck, W.L., Suberlyak, V. (2007), “Earth-tide as parameter of crustal motion correction fro SLR station displacement”, South African Journal of Geology, 110 : p. 203 – 210
Combrink, A.Z.A., Bos, M.S., Fernandes, R.M.S., Combrinck, W.L., Merry, C.L. (2007), “On the importance of proper noise modelling for long-term prcipitable water vapour trend estimations”, South African Journal of Geology, 110 : p. 211 – 218
Moeketsi, D.M., Combrinck, W.L., McKinnell, L.A., Combrink, A.Z.A. (2007), “Comparison of ionospheric total electorn content derived from collocated GNSS receivers over HartRAO during solar x-ray flares”, South African Journal of Geology, 110 : p. 219 – 224
Combrinck, W.L., Fourie, C.J.S., Croukamp, L., Saunders, I. (2007), "Report on preliminary geotechnical and tropospheric site investigation for a proposed space geodetic observatory near Matjiesfontein in the Great Karoo”, South African Journal of Geology, 110 : p. 225 – 234
Moeketsi, D.M., McKinnell, L.A., Combrinck, W.L. (2007), “Validation of UNB-Ionospheric modeling technique with ionosonde TEC measurements over South Africa”, Journal of Advances in Space Research, [?] [In press]
Moekentsi, D.M., Combrinck, W.L., McKinnell, L.A., Fedrizzi, M. (06/2007), “Mapping GPS-derived ionospheric total electron content over Southern Africa during different epochs of solar cycle 23”, Advances in Space Research, [?] [In press]
Combrink, A.Z.A., Combrinck, W.L.(2007), “Troposheric and ionospheric GNSS signal delays”, PositionIT, May/June : p. 58-61
Combrink, A.Z.A. (2007), “Rodrigues GNSS installation”, http://www.inkaba.org
Moeketsi, D.M. (2007), “Validation of UNB-IMT with ionosonde TEC measurements over South Africa”, IRI/Cost 296 Workshop, held in Prague in July 2007, http://www.ufa.cas.cz
Combrinck, L., Nickola, M. (2007), "Hartebeesthoek radio astronomy observatory”, IVS Annual Report 2007, [In press]
Booth, R., Combrinck, W.L. (2007), “White paper towards the establishment of the International Institute for Space Geodesy and Earth Observation (IISGEO)”, IISGEO Draft White Paper, vers. 3.0, July 2007
2013
Botha R.C., Strauss H. J., Bollig C., Koen W., Collett O., Kuleshov N. V., Esser M. J. D., Combrinck W. L., Von Bergmann H. M. (2013), "High average power 1314 nm Nd:YLF laser, passively Q-switched with V:YAG", Optics Letters Vol 38 Nr 6 p 980 (PDF)
Posters and Oral Presentations
2003
Combrinck, W.L. (2003), “Space Science”, SAIP Conference held in Stellenbosch, National Conf.
Botha, R.C.(2003), “Stats for gamma rays”, SAIP Conference held in Stellenbosch, National Conf.
2004
Botha, R.C. (07/2004), “Satellite Laser Ranging at HartRAO”, SAIP Conference held in Bloemfontein, National Conf.
Madiseng, S. (07/2004), “Site characterization studies (Geodetic and geophysical parameters to be considered during assessment of potential)”, SAIP Conference held in Bloemfontein, National Conf.
Combrinck, W.L. (07/2004), “Space science : working for all people, opportunities for all physicists”, SAIP Conference held in Bloemfontein, National Conf.
Combrink, A.Z.A. (07/2004), “Ground-based remote sensing of the troposphere and ionosphere”, SAIP Conference held in Bloemfontein, National Conf.
2005
Combrinck, W.L. (2005), “Heart of Africa : energy transfer from core to space”, Inkaba ye Africa workshop held in Cape Town, 29 May – 1 June 2005, National Conf.
Combrinck, W.L. (2005), “Earth and ocean monitoring network across Southern Africa”, Inkaba ye Africa workshop held in Cape Town, 29 May – 1 June 2005, National Conf.
Combrinck, W.L. (2005), “African reference frame (AFREF) and IGS TIGA project : progress”, Inkaba ye Africa workshop held in Cape Town, 29 May – 1 June 2005, National Conf.
Moeketsi, D., Ngcobo, S., Combrinck, W.L. (2005), “Using the SADC GPS networks for TEC monitoring”, Inkaba ye Africa workshop held in Cape Town, 29 May – 1 June 2005, National Conf.
Combrink, A., Combrinck, W.L. (2005), “Using the SADC GPS networks for PWV monitoring”, Inkaba ye Africa workshop held in Cape Town, 29 May – 1 June 2005, National Conf.
Suberlak, V., Combrinck, W.L. (2005), “Design and development of a new SLR/LLR station for South Africa”, Inkaba ye Africa workshop held in Cape Town, 29 May – 1 June 2005, National Conf.
Madiseng, S., Combrinck, W.L. (2005), “Space geodesy observatory site specification and investigation”, Inkaba ye Africa workshop held in Cape Town, 29 May – 1 June 2005, National Conf.
Moeketsi, D.M., Combrinck, W.L., McKinnell, L.A. (2005), “Solar cycle variations of GPS derived total electron content observed over South Africa”, IRI 2005 workshop – New satellite and ground data for IRI, and comparison with regional models. International Conf.
Botha, R.C., Bollig, C., Combrinck, W.L. (07/2005), “The development of ultrafast truly random number generator hardware”, SAIP Conference held at the Univ. of Pretoria in Pretoria, 4-8 July 2005, National Conf.
Botha, R.C., Bollig, C., Koen, W.S., Kuleshov, N.V. (07/2005), “High-power continuous-wave and passively Q-switched 1314 nm Nd:YLF laser”, SAIP Conference held at the Univ. of Pretoria in Pretoria, 4-8 July 2005, National Conf.
Botha, R.C., Bollig, C., Combrinck, W.L. (07/2005), “The development of a picosecond high-power laser for lunar laser ranging”, SAIP Conference held at the Univ. of Pretoria in Pretoria, 4-8 July 2005, National Conf.
Moeketsi, D.M., Combrinck, W.L. (07/2005), The heliospheric modulation of 3-10 MeV electrons: modelling of changes in the solar wind speed in relation to perpendicular polar diffusion, SAIP Conference held at the Univ. of Pretoria in Pretoria, 4-8 July 2005, National Conf.
Combrink, A.Z.A., Combrinck, W.L. (07/2005), “Tropospheric water vapour profiles and horizontal distributions obtained from GPS observations”, SAIP Conference held at the Univ. of Pretoria in Pretoria, 4-8 July 2005, National Conf.
Ngcobo, S., Bollig, C., Jacobs, C., Burger, J.P. (07/2005), “Blue-violet frequency-tripled Nd:YLF ring laser for holography application”, SAIP Conference held in Pretoria, 4-8 July 2005, National Conf.
Potgieter, M.S., Nkosi, G.S., Ferreira, S.E.S., Heber, B., Moeketsi, D.M. (2005), “Electron anisotropies in the inner heliosphere: a theoretical perspective”, Poster presented at the 29th International Cosmic Ray conference Pune, 00, p.101-104, International Conf.
Botha, R.C., Bollig, C., Combrinck, W.L. (2005), “The development of a high-power diode pumped pico-second laser for lunar laser ranging”, Presentation presented at the US-Africa Advanced Studies Institute on ‘Photon interactions with atoms and molecules’ held on 3rd – 12th of November 2005 in Durban, National Conf.
Bollig, C., Jacobs, C., Botha, R.C., Ngcobo, S., Strauss, H.J., Burger, J.P., Von Bergmann, H.M., Esser, M.J.D., Preussler, D., Moodley, M.K. (2005), “Diode-pumped solid-state laser research in South Africa”, Presented at the South African Institute of Physics 50th annual conference held in Pretoria in 2005, National Conf.
Bollig, C., Botha, R.C., Ngcobo, S., Kuleshov, N.V., Esser, M.J.D. (2005), “High-power CW and passively ‘switched 1314-nm end pumped nd:YLF laser”, Presented at the Mid-infrared coherent sources (MICS 2005) We6 conference held in Barcelona, Spain on 6-11 November 2005, International Conf.
Combrinck, W.L. (2005), “Proposed new space geodesy and earth observation station for South Africa”, Poster presented at the IAG/IAPSO/IABO joint assembly held in 2005. (Note – the library do not have a copy of the poster) International Conf.
2006
Combrink, A.Z.A., Fernandes, R.M.S., Bos, M.S., Combrink, W.L., Merry, C.L. (2006), “Monitoring of PWV over South Africa using GPS”, European Geophysical Union (EGU) April 2006 in Nice, France, International Conf.
Combrink, A.Z.A., Combrink, W.L., Merry, C.L. (2006), “Using the SADC GPS networks for PWV monitoring”, Inkaba yeAfrica, May 2006 in Potsdam, Germany, IInternational Conf.
Combrink, A.Z.A., Combrink, W.L, Merry, C.L. (2006), "GPS-derived precipitable water vapour: validation, application and improvement”, South African Institute of Physics (SAIP), July 2006 in Cape Town, National Conf.
Combrink, A.Z.A., Combrink, W.L, Merry, C.L. (2006), “The improvement of GPS-derived PWV accuracies using solid earth tide models based on local measurements”, COSPAR meeting in July 2006, in Beijing, China, International Conf.
Ngcobo, S., Bollig, C., Esser, M.J.D., Preussler, D., von Bergmann, M.H. (2006), “Short-pulse laser development for lunar laser ranging “, South African Institue of Physics (SAIP), July 2006 in Cape Town, National Conf.
Moeketsi, D.M. (2006), “Development towards the study of solar cycle variations of GPS derived TEC oberved over Southern Africa”, South African Institue of Physics (SAIP), July 2006 in Cape Town, National Conf.
Strauss, H.S., Bollig, C., Botha, R.C., von Bergmann, M.H., Burger, J.P. (2006), “High Power Vanadate Lasers”, South African Institue of Physics (SAIP), July 2006 in Cape Town, National Conf.
Moeketsi, D.M., Combrinck, W.L., McKinnel, L.A., Fedrizzi, M. (2006), “Effects of extreme solar EUV/X-Ray flares on GPS derived TEC over Southern Africa”, Inkaba yeAfrica, May 2006 in Potsdam, Germany, International Conf.
Botai, O.J., (2006), “Analysis of temporal evolution of Hartebeesthoek site coordinates and baseline repeatability using geodetic VLBI”, Inkaba yeAfrica, May 2006 in Potsdam, Germany, International Conf.
Combrink, A.Z.A. (11/2006), “GNSS status & applications in the framework of IISGEO”, Power Point Presentation, National Conf.
2007
Botha, R.C., Bollig, C., Koen, W.S., Saramani, A.R., Botha, L.R., Jacobs, C. (2007), “Energy scaling techniques in ultra-short pulse lasers”, SAIP 2007. National Conf.
Combrink, A.Z.A.(2007), “Tropospheric remote sensing with GPS”, SAIP 2007. National Conf.
Moeketsi, D. (2007), “Validation of UNB-IMT with ionosonde TEC measurements over South Africa”, SAIP 2007. National Conf.
Nickola, M., Combrinck, L. (2007), “Geodetic very lon baseline interferometry (VLBI) at Hartebeesthoek Radio Astronomy Observatory (HartRAO)”, The 5th Annual Inkaba yeAfrica Workshop. [ppt Poster], SAGA Biennial International Conf. 22-26 Oct. 2007
Moeketsi, D.M. (2007), “Comparison of ionospheric total electron content derived from collocated GNSS receivers over HartRAO during solar x-ray flares”, The 5th Annual Inkaba yeAfrica Workshop. [ppt Poster], SAGA Biennial International Conf. 22-26 Oct. 2007
Botha, R. (2007), “Conceptual design of the optical subsystem of the proposed lunar laser ranger”, The 5th Annual Inkaba yeAfrica Workshop. [ppt Presentation], SAGA Biennial International Conf. 22-26 Oct. 2007
Botai, J.O. (2007), “Analysis of dependency between geodetic parameters”, The 5th Annual Inkaba yeAfrica Workshop. [ppt Presentation] SAGA Biennial International Conf. 22-26 Oct. 2007
Combrink, A. (2007), “On the importance of proper noise modelling for long-term precipitable water vapour trend estimations”, The 5th Annual Inkaba yeAfrica Workshop. [ppt Presentation] SAGA Biennial International Conf. 22-26 Oct. 2007
Combrinck, W.L., Korte, M. (2007), “Heart of Africa, achievements in Inkaba yeAfrica phase 1”, [ppt Presentation], SAGA Biennial International Conf. 22-26 Oct. 2007
Botai, J.O., Combrinck, L.W., deW Rautenbach, C.J. (2007), “Analysis of temporal non-stationary tropospheric processes using geodetic PWV time series”, [ppt Presentation] IUGG held in Italy
2013
Botha R.C., Combrinck, W.L., Vargese T. (2013), "Laser System for the Lunar Laser Ranger", 3rd combined Matjiesfontein Workshop, 13 to 17 April 2013, Matjiesfontein, South Africa (Presentation PDF)
Botha R.C., Combrinck, W.L. (2013), "Developments and progress at Matjiesfontein: Equipment and Communication ", 3rd combined Matjiesfontein Workshop, 13 to 17 April 2013, Matjiesfontein, South Africa (Presentation PDF)
Botha, R.C., Combrinck, W.L. (2013), "System design of the South African Lunar Laser Ranger", 13-Po45, 18th International Workshop on Laser Ranging, 11-15 November 2013, Fujiyoshida, Japan (Poster PDF, Paper)
Combrinck, W.L., Botha, R.C. (2013), "Challenges and progress with the development of a Lunar Laser Ranger for South Africa", 13-0504, 18th International Workshop on Laser Ranging, 11-15 November 2013, Fujiyoshida, Japan (Oral PPT, Paper)
Older publications (prior 2003)
The following is an example of an application of GPS at HartRAO. Click on the filename to allow your postscript viewer to be spawned.
A slightly shorter version of this paper was published in Journal of Geophysical Research , Vol.102, NO. B11, Pages 24,741-24,743, November 10, 1997.
Conference proceedings and reports:
IGS/GPS
IGS Network Systems Workshop (2-5 November 1998) proceedings paper presented at Annapolis, USA.
Source:http://techinfo.jpl.nasa.gov/igs/files/final_drafts_jan-march99/gurtner_w
IGS Network, Data and Analysis Center Workshop 2002, 'Towards real time', paper presented at Ottawa, Canada, April 2002.
IGS Network, Data and Analysis Center Workshop 2002, 'Towards real time', paper presented at Ottawa, Canada, April 2002, overheads
International GPS Service 2000 Technical Report, edited by K Gowey, R.Neilan, A.Moore. (PDF)
(page 187-191)
Phys. Chem. Earth(A), Vol. 26, No. 6-8, pp. 539-544, 2001. Proceedings of the First COST Action 716 Workshop "Towards Operational GPS Meteorology" and the Second Network workshop of the International GPS Service (IGS), Oslo, Norway, July 2000, guest editors H.-P. Plag, S Barlag, M. Caissy, L. Combrinck, G. Elgered, A. Moore, H. ven der Marel. (GZipped Postscript version)
IVS/VLBI
Proceedings of the First IVS General Meeting, edited by N. R. Vandenberg, NASA/CP-2000-209893. (GZipped Postscript version)
Satellite Laser Ranging/ISLRS
International Laser Ranging Service, 2001 Annual Report. HartRAO MOBLAS-6 station report.
General
FIG Working Week & Survey 99 (June 1999) proceedings paper. (GZipped Postscript version)
The Eleventh General Assembly of the WEGENER Project, WEGENER 2002, Athens, Greece, June 12-14.
Collaborations and Joint Publications
Joint publication in 'Bulletin d'Information des Marées Terrestres (BIM) ', 2002, resulting from the Jena 2002 paper presented by Juergen Neumeyer at the Third Workshop of the Global Geodynamics Project (GGP) on Superconducting Gravimetry.
Joint conference paper 'The IGS station and its Role in Land Delivery in Zambia', presented by Peter Nsombo of the University of Zambia, (Lusaka) at the IVth UN/USA Regional Workshop on the use and application of global satellite systems, 15-19 July, 2002, held at the Mulungushi International Conference Centre, Lusaka, Zambia.