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Electromagnetic ion cyclotron waves in the plasma depletion layerResults of a study of the theoretical properties of electromagnetic ion cyclotron (EMIC) waves which occur in the plasma depletion layer are presented. The analysis assumes a homogeneous plasma with the characteristics which were measured by the AMPTE/CCE satellite at 1450-1501 UT on October 5, 1984. Waves were observed in the Pc 1 frequency range below the hydrogen gyrofrequency, and these waves are identified as EMIC waves. The higher-frequency instability is driven by the temperature anisotropy of the H(+) ions, while the lower-frequency instability is driven by the temperature anisotropy of the He(2+) ions. It is argued that the higher-frequency waves will have k roughly parallel to B(0) and will be left-hand polarized, while the lower frequency wave band will have k oblique to B(0) and will be linearly polarized, in agreement with observations.
Document ID
19930071554
Document Type
Reprint (Version printed in journal)
Authors
Denton, Richard E. (NASA Headquarters Washington, DC United States)
Hudson, Mary K. (Dartmouth College Hanover, NH, United States)
Fuselier, Stephen A. (Lockheed Research Lab. Palo Alto, CA, United States)
Anderson, Brian J. (Johns Hopkins Univ. Laurel, MD, United States)
Date Acquired
August 16, 2013
Publication Date
August 1, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: A8
ISSN: 0148-0227
Subject Category
GEOPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAGW-3052
CONTRACT_GRANT: NAS5-31213
CONTRACT_GRANT: NAGW-1652
CONTRACT_GRANT: NAS5-30565
Distribution Limits
Public
Copyright
Other