Obliquely propagating electromagnetic drift ion cyclotron instability

Details Obliquely propagating electromagnetic drift ion cyclotron instability Obliquely propagating electromagnetic drift ion cyclotron instability

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11504218m&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A4, CiteID A04218

Physics

1

Ionosphere: Plasma Waves And Instabilities (2772), Magnetospheric Physics: Substorms, Magnetospheric Physics: Magnetotail, Ionosphere: Wave Propagation (0689, 3285, 4275, 4455, 6934)

Scientific paper

Identification of wave characteristics during current disruption events in the near-Earth geomagnetic tail region is important for understanding the substorm onset mechanism. The present paper discusses a linear stability analysis in the ion cyclotron frequency range of a plasma possessing the temperature anisotropy and cross-field flow. It is found that the ion cyclotron drift waves propagating in quasi-perpendicular direction with respect to the ambient magnetic field are characterized by low frequencies (ω $\lesssim$ 0.5Ωi), while quasi-parallel waves have frequencies close to the ion cyclotron frequency (ω ˜ Ωi). This finding is consistent with the observation by THEMIS spacecraft of a current disruption event in which similar high- and low-frequency band structures are present. The interpretation of the low-frequency mode as the quasi-perpendicular mode is consistent with a recent data analysis. The present paper shows that the high-frequency quasi-parallel mode can simultaneously be excited with the low-frequency quasi-perpendicular mode.

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