Physics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1955a&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, Nov. 1991, p. 1955-1958. Research supported by NSF and U.S. Navy.
Physics
73
Electromagnetic Radiation, Geomagnetic Pulsations, Ion Cyclotron Radiation, Magnetosheath, Plasma Compression, Plasma Layers, Plasma Sheaths, Ampte (Satellites), Extremely Low Radio Frequencies, Photons, Power Spectra, Spectrograms, Transverse Waves
Scientific paper
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(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.
Anderson Benjamin J.
Fuselier Stephen A.
Murr David
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