Energy spectrum of proton flux near geomagnetic equator at low altitudes |
| |
Authors: | AN Petrov OR GrigoryanMI Panasyuk |
| |
Institution: | Skobeltsyn Institute of Nuclear Physics, Moscow State University, 119992 Moscow, Russia |
| |
Abstract: | The results of proton energy (tens keV – several MeV) spectrum measurements near geomagnetic equator (L < 1.15) at low altitudes (<1000 km) 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. |
| |
Keywords: | Low-energy near-equatorial protons STEB Double charge exchange Ring current |
本文献已被 ScienceDirect 等数据库收录! |