Observation of low energy particle precipitation at low altitude in the equatorial zone |
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| Institution: | 1. Department of Anthropology, University of British Columbia, Vancouver, BC, Canada;2. Expertise Center in Mining Governance (CEGEMI), Catholic University of Bukavu, Bukavu, South Kivu, Democratic Republic of the Congo;3. Stellenbosh Institute for Advanced Study (STIAS), South Africa;1. Zhejiang International Studies University, 299 Liuhe Rd, Xihu District, Hangzhou, 310023, China;1. Department of Geography, Durham University, Lower Mountjoy, South Road, Durham DH1 3LE, United Kingdom;2. Department of Geography and Regional Research, University of Vienna, Universitätsstraße 7, 1010 Vienna, Austria |
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| Abstract: | Precipitation of protons (~ 1 MeV) in the equatorial zone was investigated by the Phoenix-1 experiment on board the S81-1 mission from May–November, 1982. The protons show a precipitation peak along the line of minimum magnetic field strength with a full width at half maximum (FWHM) of 13°. The index of equatorial pitch angle distribution is q ~ 19. The peak proton flux shows a fifth-power altitude dependence, and the proton flux shows approximately a factor of 3 times increase in 1982 compared to that in 1969 due, possibly, to the stronger (~ 1.2 times) solar maximum conditions of 10.7cm radiation in 1982. |
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