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Solar cycle dependence of the geomagnetically trapped anomalous cosmic rays
Author(s) -
Selesnick R. S.,
Cummings A. C.,
Leske R. A.,
Mewaldt R. A.,
Stone E. C.,
Cummings J. R.
Publication year - 2000
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 - 10.1029/2000gl000049
Subject(s) - cosmic ray , earth's magnetic field , physics , solar cycle 22 , solar cycle , solar energetic particles , interplanetary spaceflight , solar wind , interplanetary magnetic field , geomagnetic storm , interplanetary medium , atmospheric sciences , computational physics , satellite , atmosphere (unit) , astrophysics , coronal mass ejection , astronomy , meteorology , magnetic field , plasma , nuclear physics , quantum mechanics
Solar cycle variations in the intensity of geomagnetically trapped anomalous cosmic ray (ACR) oxygen are demonstrated by ∼7 years of data from the SAMPEX satellite. They correspond to similar variations in the interplanetary ACR source. Trapped particle losses during the approach to solar maximum are not associated with geomagnetic activity and may be consistent with atmospheric energy degradation. The average trapped particle pitch angle distribution and energy spectra support this interpretation in which both source and loss rates are proportional to atmospheric density.