AbstractThe results of proton energy (tens keV – several MeV) spectrum measurements near geomagnetic equator (L<1.15) at low altitudes (<1000km) are presented. We used data of experiments onboard ACTIVE, SAMPEX, NOAA TIROS-N satellites and SPRUT-VI (MIR station) and cover a time range of about 30 years (including previous measurements). It was found that the kappa-distribution function fits the experimental spectrum with the best correlation coefficient. A comparison of energy spectra of near-equatorial protons and ring-current protons was made. Using the estimation of the life time of near-equatorial protons we explain the difference in spectral indices of radiation belt and near-equatorial proton formation. We conclude that the ring current is the main source of the near-equatorial protons.
Energy spectrum of proton flux near geomagnetic equator at low altitudes
Advances in Space Research ; 41 , 8 ; 1269-1273
2007-08-03
5 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Energy spectrum of proton flux near geomagnetic equator at low altitudes
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