Physics
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11..331t&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 11, April 1984, p. 331-334. NASA-supported research.
Physics
39
Boundary Layer Plasmas, Geomagnetic Tail, Magnetoacoustic Waves, Magnetospheric Instability, Plasma Waves, Space Plasmas, International Sun Earth Explorer 3, Phase Velocity, Plasma Compression, Polarization Characteristics, Wave Generation
Scientific paper
The presence of large-amplitude magnetosonic waves in the distant plasma sheet boundary layers is demonstrated, and their properties are discussed. The waves for almost all the events examined are right-hand circularly polarized, with the degree of polarization varying from 1.04 to 1.87, i.e., from circular to slightly elliptical. The waves are all propagating nearly along the magnetic field. Their periods vary from 3.7 seconds to as long as 35 seconds, with a median value of about 10 seconds, and are slightly larger than the proton gyroperiod in all but two cases. Most waves have a relatively large compressional component varying from 30 to 90 percent of the wave amplitude. Several possible generation mechanisms are discussed, along with the role that the waves may play in the heating and expansion of the plasma sheet.
Smith Edward. J.
Tsurutani Bruce T.
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