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

H. Kawano, M. Fujimoto, T. Mukai, T. Yamamoto, T. Terasawa, Y. Saito, S. Machida, S. Kokubun, A. Nishida

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

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 XGSM = −142RE. 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 cold 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.

Original languageEnglish
Pages (from-to)2887-2890
Number of pages4
JournalGeophysical Research Letters
Volume21
Issue number25
DOIs
Publication statusPublished - Dec 15 1994
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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