Right-handed ion/ion resonant instability in the plasma sheet boundary layer: GEOTAIL observation in the distant tail

Details Right-handed ion/ion resonant instability in the plasma sheet boundary layer: GEOTAIL observation in the distant tail Right-handed ion/ion resonant instability in the plasma sheet boundary layer: GEOTAIL observation in the distant tail

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2887k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 25, p. 2887-2890

Physics

9

Boundary Layers, Geomagnetic Tail, Ionic Collisions, Magnetohydrodynamic Stability, Plasma Resonance, Plasma Waves, Satellite Observation, Space Plasmas, Cold Plasmas, Cyclotron Frequency, Dense Plasmas, Geophysical Satellites, Ion Distribution, Noise Spectra, Radiation Spectra, Vlasov Equations

Scientific paper

An excellent example of an onset of the right-handed ion/ion resonant instability is observed on October 8, 1993, when the Geotail was in the distant tail of X(sub GSM) = -142 R(sub E). Preceding and following a passage of a plasmoid, magnetic noises having a right-hand circular polarity with the frequencies around the proton cyclotron frequency are detected. Especially, the event after the passage lasted for more than 10 min., and the ion plasma in this boundary layer was composed of a tailward streaming colde dense plasma and a warm tailward beam coming presumably from the plasma sheet, drifting at 1000 km/s relative to the former along the field line. We have used this distribution as a source function for a linear Vlasov analysis, and confirmed that the generation mechanism of the waves can well be explained in terms of the resonant interaction with the beam.

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