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Title: Electromagnetic ion cyclotron waves observed in the plasma depletion layer

Abstract

Observations 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{sub H{sup +}} {le} 1.0 and a slot in spectral power at F/F{sub H{sup +}} = 0.5. The upper branch is left hand polarized while the lower branch is linearly polarized. In the sheath the proton temperature anisotropy, A = T{sub {perpendicular}}/T{sub {parallel}} {minus} 1, is {approx} 0.6 but it is {approx} 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.

Authors:
 [1];  [2];  [3]
  1. Johns Hopkins Univ., Laurel, MD (United States)
  2. Lockheed Palo Alto Research Lab., CA (United States)
  3. Augsburg Coll. (Germany)
Publication Date:
OSTI Identifier:
7278116
Resource Type:
Journal Article
Journal Name:
Geophysical Research Letters (American Geophysical Union); (United States)
Additional Journal Information:
Journal Volume: 18:11; Journal ID: ISSN 0094-8276
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; MAGNETOSHEATH; ION WAVES; ANISOTROPY; COMPRESSION; EARTH MAGNETOSPHERE; ELECTRON DENSITY; HYDROMAGNETIC WAVES; ION DENSITY; PLASMA DENSITY; PLASMA PRESSURE; PROTON TEMPERATURE; PULSATIONS; SATELLITES; SOLAR WIND; EARTH ATMOSPHERE; PLASMA WAVES; SOLAR ACTIVITY; 661320* - Auroral, Ionospheric, & Magnetospheric Phenomena- (1992-)

Citation Formats

Anderson, B J, Fuselier, S A, and Murr, D. Electromagnetic ion cyclotron waves observed in the plasma depletion layer. United States: N. p., 1991. Web. doi:10.1029/91GL02238.
Anderson, B J, Fuselier, S A, & Murr, D. Electromagnetic ion cyclotron waves observed in the plasma depletion layer. United States. https://doi.org/10.1029/91GL02238
Anderson, B J, Fuselier, S A, and Murr, D. 1991. "Electromagnetic ion cyclotron waves observed in the plasma depletion layer". United States. https://doi.org/10.1029/91GL02238.
@article{osti_7278116,
title = {Electromagnetic ion cyclotron waves observed in the plasma depletion layer},
author = {Anderson, B J and Fuselier, S A and Murr, D},
abstractNote = {Observations 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{sub H{sup +}} {le} 1.0 and a slot in spectral power at F/F{sub H{sup +}} = 0.5. The upper branch is left hand polarized while the lower branch is linearly polarized. In the sheath the proton temperature anisotropy, A = T{sub {perpendicular}}/T{sub {parallel}} {minus} 1, is {approx} 0.6 but it is {approx} 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.},
doi = {10.1029/91GL02238},
url = {https://www.osti.gov/biblio/7278116}, journal = {Geophysical Research Letters (American Geophysical Union); (United States)},
issn = {0094-8276},
number = ,
volume = 18:11,
place = {United States},
year = {Fri Nov 01 00:00:00 EST 1991},
month = {Fri Nov 01 00:00:00 EST 1991}
}