Global Zones of Particle Precipitation as Observed by EXOS-C
Annual rept. 1 Jul 1991-30 Jun 1992
ARKANSAS UNIV AT PINE BLUFF SPACE AND ENVIRONMENT STUDIES LAB
Pagination or Media Count:
A study of the temporal variation of quasi-trapped proton population near the geomagnetic equator reveals that the peak value of the equatorially mirroring component may increase by a factor of 50 or more between a solar maximum and a minimum conditions. During a solar maximum condition more hydrogen escape to outer space than during a minimum condition. The escaping light gas may cause more neutral generation by charge exchange interaction with the radiation beltring current protons, thereby enhancing the quasitrapped proton population at equatorial thermospheric altitude. This reported result is based on the observation of quasitrapped proton population in 1969-70, 1982, and 1984- 86 by AZUR, S81-1, and EXOS-C missions. Also, a study based on EXOS-C mission alone shows that the peak flux profile of protons precipitate in the equatorial, and low-latitude, midlatitude, and auroral zones lying to the north of the equator, exist in parallel with the minimum magnetic field equator. Further, proton 0.64-35 MeV and electron 0.19 - 3.2 MeV population in the said midlatitude zone show longitude and altitude dependences. Contrary to previous observations, the locations of the peak flux profiles in all the three zones in L space depend upon the pitch of the particles.
- Atmospheric Physics