Low-altitude trapped protons at the geomagnetic equator

Details Low-altitude trapped protons at the geomagnetic equator Low-altitude trapped protons at the geomagnetic equator

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94..145g&link_type=abstract

(Chapman Conference on Plasma Waves and Instabilities in Magnetospheres and at Comets, Sendai, Japan, Oct. 12-16, 1987) Journal

Physics

10

Equatorial Atmosphere, Magnetic Equator, Magnetically Trapped Particles, Proton Energy, Proton Flux Density, Energy Spectra, Geomagnetic Latitude, Kinetic Energy, Telescopes

Scientific paper

Geomagnetically trapped protons in the 0.6- to 9-MeV energy range were measured at latitudes near the geomagnetic equator by the Phoenix 1 experiment on board the S81-1 mission from May to November 1982. The protons show a distribution in latitude along the line of minimum magnetic field strength with a full width at half maximum of about 10 deg but with no appreciable longitudinal variation. Between 170 and 290 Km the peak proton flux shows a fifth-power altitude dependence, in contrast to previous measurements at higher altitudes, possibly demonstrating source attenuation. The efficiency of the telescope is calculated as a function of particle pitch angle and used to investigate the time dependence (1969-1982) of the intensity.

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