Physics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993arku.rept......&link_type=abstract
Final Annual Report, 31 Jul. 1989 - 30 Jun. 1993 Arkansas Univ., Pine Bluff. Space and Environment Studies Lab.
Physics
Auroral Zones, Auroras, Electrons, Exos-C Satellite, Geomagnetism, Particle Precipitation, Periodic Variations, Precipitation (Meteorology), Protons, Solar Radiation, Angular Distribution, Artificial Satellites, Flux (Rate), Magnetic Field Configurations, Magnetic Fields, Radiation Belts
Scientific paper
A study of the precipitation of protons (0.64 - 35 MeV) and electrons (0.19 - 3.2 MeV) in the northern auroral zone based on the observations of EXOS-C satellite during 1994-86 reveal that the global peak flux profile follows the global minimum magnetic field profile with a full-width-at-half-maximum (FWFM) of approx 7 deg for the proton zone and approximately 5 deg for the electron zone. Maximum particle flux occurs in the longitude range of 36 deg-72 deg, and minimum in 216 deg-252 deg. Both the kinds of fluxes show the altitude dependence with the electron flux having pronounced exponential dependence. The instrument (S-1 telescope) response function correlates very well with the angle-chi between the telescope axis and the local magnetic field direction. The particle flux depends on chi in the same way as the particle pitch angle distribution sin(sup n)alpha. It is found that the variation of flux with L depends on the angle chi. Both these types of flux varies with the local time having peak values at early morning hours. A study of the monthly variation shows that fluxes of both protons and electrons show significantly relative variation and also a periodicity of maximum and minimum. This long-term variation is thought to be related with magnetospheric conditions.
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