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Electromagnetic ion cyclotron waves observed in the plasma depletion layerObservations from AMPTE/CCE in the earth's magnetosheath on October 5, 1984 are presented to illustrate 0.1 - 4.0 Hz magnetic field pulsations in the subsolar plasma depletion layer (PDL) for northward sheath field during a magnetospheric compression. The PDL is unambiguously identified by comparing CCE data with data from IRM in the upstream solar wind. Pulsations in the PDL are dominated by transverse waves with F/F(H+) 1.0 or less and a slot in spectral power at F/F(H+) = 0.5. The upper branch is left hand polarized while the lower branch is linearly polarized. In the sheath the proton temperature anisotropy is about 0.6 but it is about 1.7 in the PDL during wave occurrence. The properties and correlation of waves with increased anisotropy indicate that they are electromagnetic ion cyclotron waves.
Document ID
19920030308
Document Type
Reprint (Version printed in journal)
Authors
Anderson, B. J. (Johns Hopkins University Laurel, MD, United States)
Fuselier, S. A. (Lockheed Research Laboratories Palo Alto, CA, United States)
Murr, D. (Augsburg College Minneapolis, MN, United States)
Date Acquired
August 15, 2013
Publication Date
November 1, 1991
Publication Information
Publication: Geophysical Research Letters
Volume: 18
ISSN: 0094-8276
Subject Category
GEOPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAS5-30565
Distribution Limits
Public
Copyright
Other