Physics – Space Physics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ijrsp..20..127m&link_type=abstract
Indian Journal of Radio and Space Physics (ISSN 0367-8393), vol. 20, April 1991, p. 127-134.
Physics
Space Physics
2
Equatorial Regions, Magnetic Storms, Proton Precipitation, Solar Terrestrial Interactions, Earth Magnetosphere, Proton Energy, Radiation Belts, Ring Currents, Satellite Observation
Scientific paper
Particle precipitation near the equator within + or - 30 deg geomagnetic latitude was investigated by the Phoenix-1 instrumentation on board the S81-1 mission. The monitor telescope on board the mission was sensitive to protons in the energy range 0.6-9.1 MeV, to alpha particles in the energy range 0.4-80 MeV/nucleon and Z equal to or greater than 3 particles (C-12) of energy greater than 0.7 MeV/nucleon. The peak efficiency of the telescope was for particles of about 88-deg pitch angles at the line of minimum magnetic field. Careful separation of the magnetically quiet time equatorial particle data from global data coverage and subsequent analysis shows that the ML detector on board the mission detected mostly protons. The proton peak flux profile follows the line of minimum magnetic field. The full width at half maximum (FWHM) of the equatorial zone is about 13 deg, which is well within the EUV emission zone.
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