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Low-energy ion distribution functions on a magnetically quiet day at geostationary altitude /L = 7/Ion energy and pitch angle distribution functions are examined for a magnetically quiet day using averaged data from ATS 6. For both field-aligned and perpendicular fluxes, the populations have a mixture of characteristic energies, and the distribution functions can be fairly well approximated by Maxwellian distributions over three different energy bands in the range 3-600 eV. Pitch angle distributions varying with local time, and energy distributions are used to compute total ion density. Pitch angle scattering mechanisms responsible for the observed transformation of pitch angle distribution are examined, and it is found that a magnetic noise of a certain power spectral density belonging to the electromagnetic ion cyclotron mode near the ion cyclotron frequency can be effective in trapping the field aligned fluxes by pitch angle scattering.
Document ID
19820038624
Document Type
Reprint (Version printed in journal)
Authors
Singh, N. (NASA Marshall Space Flight Center Huntsville, AL; Utah State University of Agriculture and Applied Science, Logan, UT, United States)
Raitt, W. J. (Utah State University of Agriculture and Applied Science, Logan, UT, United States)
Yasuhara, F. (Utah State University of Agriculture and Applied Science, Logan, UT; Chukyo University, Nagoya, Japan)
Date Acquired
August 10, 2013
Publication Date
February 1, 1982
Publication Information
Publication: Journal of Geophysical Research
Volume: 87
Subject Category
GEOPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAS8-32636
Distribution Limits
Public
Copyright
Other