Electromagnetic ion cyclotron waves observed in the plasma depletion layer

Journal Article · Fri Nov 01 04:00:00 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), Journal Name: Geophysical Research Letters (American Geophysical Union); (United States) Vol. 18:11; ISSN 0094-8276; ISSN GPRLA
• Country of Publication: United States
• Language: English

Related Subjects

661320* -- Auroral
Ionospheric
& Magnetospheric Phenomena-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANISOTROPY
COMPRESSION
EARTH ATMOSPHERE
EARTH MAGNETOSPHERE
ELECTRON DENSITY
HYDROMAGNETIC WAVES
ION DENSITY
ION WAVES
MAGNETOSHEATH
PLASMA DENSITY
PLASMA PRESSURE
PLASMA WAVES
PROTON TEMPERATURE
PULSATIONS
SATELLITES
SOLAR ACTIVITY
SOLAR WIND