Accession Number : ADA256397


Title :   Global Zones of Particle Precipitation as Observed by EXOS-C


Descriptive Note : Annual rept. 1 Jul 1991-30 Jun 1992


Corporate Author : ARKANSAS UNIV AT PINE BLUFF SPACE AND ENVIRONMENT STUDIES LAB


Personal Author(s) : Miah, M A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a256397.pdf


Report Date : 27 Sep 1992


Pagination or Media Count : 34


Abstract : 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 belt/ring 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.


Descriptors :   *PROTONS , *CHARGE DENSITY , *RADIATION BELTS , PEAK VALUES , MAGNETIC FIELDS , INTERACTIONS , REGIONS , ELECTRONS , ALTITUDE , LATITUDE , PRECIPITATES , LONGITUDE , EXCHANGE , MISSIONS , PROFILES , HYDROGEN , POPULATION , NEUTRAL , OBSERVATION


Subject Categories : Atmospheric Physics


Distribution Statement : APPROVED FOR PUBLIC RELEASE