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Evidence for trapped anomalous cosmic ray oxygen ions in the inner magnetosphere
Author(s) -
Grigorov N. L.,
Kondratyeva M. A.,
Panasyuk M. I.,
Tretyakova Ch. A.,
Adams J. H.,
Blake J. B.,
Schulz M.,
Mewaldt R. A.,
Tylka A. J.
Publication year - 1991
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 - 10.1029/91gl02551
Subject(s) - physics , cosmic ray , ion , magnetosphere , charged particle , isotropy , van allen radiation belt , anisotropy , diffusion , particle (ecology) , monte carlo method , astrophysics , atomic physics , computational physics , nuclear physics , plasma , optics , geology , oceanography , statistics , mathematics , quantum mechanics , thermodynamics
A series of measurements of 5–30 MeV/nucleon oxygen ions made with track detector stacks on Cosmos satellites show isotropic angular distributions during solar energetic particle events. Solar‐quiet times, on the other hand, have highly anisotropic distributions suggestive of a trapped‐particle component. Detailed Monte Carlo simulations confirm this interpretation and allow us to measure the trapped and cosmic‐ray contributions to the observed fluxes. Our data are fully consistent with anomalous cosmic‐ray ions, rather than radial diffusion from the outer zone, as the source of the trapped particles.