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A bounce‐averaged kinetic model of the ring current ion population
Author(s) -
Jordanova V. K.,
Kozyra J. U.,
Khazanov G. V.,
Nagy A. F.,
Rasmussen C. E.,
Fok M.C.
Publication year - 1994
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/94gl02695
Subject(s) - ring current , physics , kinetic energy , population , adiabatic process , drag , pitch angle , ion , atomic physics , coulomb , electric field , computational physics , proton , mechanics , particle acceleration , current (fluid) , acceleration , electron , classical mechanics , magnetosphere , nuclear physics , geophysics , plasma , quantum mechanics , demography , sociology , thermodynamics
A bounce‐averaged ring current kinetic model for arbitrary pitch angle, including losses due to charge exchange and Coulomb collisions along ion drift paths, is developed and solved numerically. Results from simplified model runs, intended to illustrate the effects of adiabatic drifts and collisional losses on the proton population, are presented. The processes of i) particle acceleration under the conditions of time‐independent magnetospheric electric fields; ii) a predominant loss of particles with small pitch angles due to charge exchange; and iii) a buildup of a low‐energy population caused by the Coulomb drag energy degradation, are discussed.