Generation of downshifted oscillations in the electron foreshock: A loss-cone instability

Details Generation of downshifted oscillations in the electron foreshock: A loss-cone instability Generation of downshifted oscillations in the electron foreshock: A loss-cone instability

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3218101l&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 18, CiteID L18101

Physics

Plasma Physics

11

Interplanetary Physics: Planetary Bow Shocks, Interplanetary Physics: Plasma Waves And Turbulence, Space Plasma Physics: Kinetic Waves And Instabilities

Scientific paper

Measurements performed aboard Cluster spacecraft near Earth's bow shock on 24 January 2001 provide convincing evidence of a loss-cone feature within the electron foreshock region. This feature is formed by suprathermal electrons with energies 15-45 eV and pitch angles 130°-150° and is always accompanied by electrostatic waves with frequencies well below the local plasma frequency. An instability analysis shows that these downshifted oscillations can result from a loss-cone instability of electron cyclotron modes rather than from the beam instability as previously suggested.

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