Electromagnetic ion cyclotron waves observed in the plasma depletion layer

Journal Article · Fri Nov 01 00:00:00 EST 1991 · Geophysical Research Letters (American Geophysical Union); (United States)

DOI:https://doi.org/10.1029/91GL02238· OSTI ID:7278116

Anderson, B J ^[1]; Fuselier, S A ^[2]; Murr, D ^[3]

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1. Johns Hopkins Univ., Laurel, MD (United States)
2. Lockheed Palo Alto Research Lab., CA (United States)
3. Augsburg Coll. (Germany)

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.

• OSTI ID: 7278116
• Journal Information: Geophysical Research Letters (American Geophysical Union); (United States), Vol. 18:11; ISSN 0094-8276
• Country of Publication: United States
• Language: English

Related Subjects

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-)