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Title: Features of the Mechanism of Formation of the Radiation Belt of High-Energy Electrons and Positrons

Abstract

New results of the PAMELA experiment revealed significant difference in the electron and positrons flux and fraction between trapped particles of the radiation belt and quasitrapped particles. A decrease in the ratio of the electron-to-positron fluxes both with increasing altitude and with decreasing energy was observed for the inner radiation belt, but this does not fit in currently used models. The residual atmosphere density in the trapping region for L ~ 1.15−1.2 is estimated on the basis of calculations of trapped-particle trajectories in the Earth’s magnetosphere. It is shown that processes leading to the energy loss for trapped electrons and positrons in the interactions with residual-atmosphere atoms play an important role in the formation of fluxes of these particles, but these processes cannot cause the reduction of the positron fraction in the total flux at energies below some 100 MeV. The role of the process of δ-electron production in the formation of the belt of trapped electrons and positrons is considered. Allowance for this process makes it possible to explain the above reduction at least partly.

Authors:
; ;  [1]
  1. National Research Nuclear University MEPhI (Russian Federation)
Publication Date:
OSTI Identifier:
22758673
Resource Type:
Journal Article
Journal Name:
Physics of Atomic Nuclei
Additional Journal Information:
Journal Volume: 81; Journal Issue: 4; Other Information: Copyright (c) 2018 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7788
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ALTITUDE; ATOMS; DENSITY; ENERGY LOSSES; MEV RANGE 10-100; PARTICLES; POSITRONS; RADIATION BELTS; TRAJECTORIES; TRAPPED ELECTRONS; TRAPPING

Citation Formats

Mikhailova, Yu. V., E-mail: yvmikhaylova@mephi.ru, Galper, A. M., and Mikhailov, V. V. Features of the Mechanism of Formation of the Radiation Belt of High-Energy Electrons and Positrons. United States: N. p., 2018. Web. doi:10.1134/S1063778818040130.
Mikhailova, Yu. V., E-mail: yvmikhaylova@mephi.ru, Galper, A. M., & Mikhailov, V. V. Features of the Mechanism of Formation of the Radiation Belt of High-Energy Electrons and Positrons. United States. doi:10.1134/S1063778818040130.
Mikhailova, Yu. V., E-mail: yvmikhaylova@mephi.ru, Galper, A. M., and Mikhailov, V. V. Sun . "Features of the Mechanism of Formation of the Radiation Belt of High-Energy Electrons and Positrons". United States. doi:10.1134/S1063778818040130.
@article{osti_22758673,
title = {Features of the Mechanism of Formation of the Radiation Belt of High-Energy Electrons and Positrons},
author = {Mikhailova, Yu. V., E-mail: yvmikhaylova@mephi.ru and Galper, A. M. and Mikhailov, V. V.},
abstractNote = {New results of the PAMELA experiment revealed significant difference in the electron and positrons flux and fraction between trapped particles of the radiation belt and quasitrapped particles. A decrease in the ratio of the electron-to-positron fluxes both with increasing altitude and with decreasing energy was observed for the inner radiation belt, but this does not fit in currently used models. The residual atmosphere density in the trapping region for L ~ 1.15−1.2 is estimated on the basis of calculations of trapped-particle trajectories in the Earth’s magnetosphere. It is shown that processes leading to the energy loss for trapped electrons and positrons in the interactions with residual-atmosphere atoms play an important role in the formation of fluxes of these particles, but these processes cannot cause the reduction of the positron fraction in the total flux at energies below some 100 MeV. The role of the process of δ-electron production in the formation of the belt of trapped electrons and positrons is considered. Allowance for this process makes it possible to explain the above reduction at least partly.},
doi = {10.1134/S1063778818040130},
journal = {Physics of Atomic Nuclei},
issn = {1063-7788},
number = 4,
volume = 81,
place = {United States},
year = {2018},
month = {7}
}