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<\/a>\n\t\t\t<\/div>\n\t\t\t\tClick here<\/a> to view documents and images of Prof Stoker on the ALSA Archive.<\/p>\n Personal memories of Prof Pieter Stoker by Pierre Cilliers, South African National Space Agency (SANSA), Hermanus <\/span><\/b>(snippet taken from piece written on 2022-11-10)<\/span><\/b> Prof Pieter Stoker left his mark in my career! I met Prof Pieter for the first time at the prize-giving function of the Matric Mathematics Olympiad at Potchefstroom University in 1970. At the time, he was already a well-known lecturer and researcher and as a young man strongly encouraged me to further my studies in natural sciences. Years later when, as a researcher at the Hermanus Magnetic Observatory, I had the opportunity to visit NWU again to present a lecture on space weather, I made contact again with him. I was responsible for recording the calibration readings on the neutron monitors at the HMO from time to time, often liaising with him whenever there seemed to be an anomaly on the data. I understand from Pieter Kotze that the neutron monitor station with which cosmic radiation is observed at the HMO in Hermanus is the oldest continuously registering station in the world. This would certainly not have been possible without the contribution of Prof Pieter Stoker. It has been in operation since 1957. Although there are older stations, the others are intermittent at times. Thanks to Prof Pieter, the HMO station was nonstop.<\/span> <\/span><\/p>\n When I visited SANAE IV in December 2006, I saw the NWU’s imaging riometer in operation and found out that Prof Stoker and his PhD student Burt Wilson were responsible for the design thereof. I was convinced that one would find a correlation between ionospheric events on SANAE as observed with the image riometer, the Aurora cameras, and the ionospheric sintillation receivers that I helped install at SANAE in 2006. Prof Pieter supported the research idea. The bottom line was that I had the privilege of working with him on an article on riometer measurements and sintillation measurements on SANAE (click here<\/a> to view the paper that was submitted for publication). In 2009, Prof Pieter visited the HMO in Hermanus during the Winter School to talk about upgrading the imaging riometer at SANAE IV. Below a photo taken at the event. <\/span> <\/span><\/p>\n![\"\"](\"https:\/\/blogs.sun.ac.za\/antarcticlegacy\/files\/2022\/11\/prof_stoker_antarctic_bulletin_1965.jpg\" "\\"Click")
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![\"Prof](\"https:\/\/blogs.sun.ac.za\/antarcticlegacy\/files\/2022\/11\/Prof-Stoker-Visit-to-HMO-2-June-2009.jpg\")
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