Trapped positron flux formation in the innermost magnetosphere of the Earth
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- Gusev A. A.
- Instituto Nacional de Pesquisas Espaciais
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- Jayanthi U. B.
- Instituto Nacional de Pesquisas Espaciais
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- Pugacheva G. I.
- Instituto Nacional de Pesquisas Espaciais
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- Pankov V. M.
- Space Research Institute of Russian Academy of Science
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- Schuch N.
- Southern Regional Space Research Center/INPE
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The possible existence of a positron radiation belt in the inner magnetosphere of the Earth, its space location, flux, energy distribution and the ratio of e+/e- fluxes is considered. The source of the positrons/electrons is assumed to be the decay of charged pions (π - μ - e decay chain) produced, in the nuclear interactions between protons and the neutral constituents of the atmosphere. The production of excess positron fluxes over electron ones through this process is examined for two different proton populations and their atmospheric interactions in the altitude range of 80 to 1000 km. Monte Carlo simulations of intra-nuclear cascade process through SHIELD code was utilized to simulate these interactions. Considering the trapped proton fluxes in the inner magnetosphere as a source, the simulations for interactions in rarified atmosphere shows excess of positrons over electrons with ratios above 2 for proton energies below 2.5 GeV. Although, protons above this energy do not produce excess of positrons compared to electrons in atmospheric interactions, we assumed the primary cosmic rays with the energy greater than 8-10 GeV also as a source for these interactions, and utilizing the east-west asymmetry in the arrival directions of these primary cosmic rays combined with the exponential nature of the atmosphere density we also obtained an excess of positrons over electrons escaping from the atmosphere to the altitudes of satellite orbits. A comparison is attempted with the recent data of AMS experiment on board the space shuttle.
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 54 (6), 707-714, 2002
地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会
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- CRID
- 1390282681488689152
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- NII論文ID
- 10008698574
- 130003956309
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- NII書誌ID
- AA11211921
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- ISSN
- 18805981
- 13438832
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- NDL書誌ID
- 6191063
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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