Electromagnetic ion cyclotron waves at proton cyclotron harmonics

Details Electromagnetic ion cyclotron waves at proton cyclotron harmonics Electromagnetic ion cyclotron waves at proton cyclotron harmonics

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1351c&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 107, Issue A11, pp. SMP 8-1, CiteID 1351, DOI 10.1029/2001JA900141

Physics

Plasma Physics

9

Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Plasma Waves And Instabilities, Radio Science: Waves In Plasma, Space Plasma Physics: Waves And Instabilities

Scientific paper

Waves with frequencies in the vicinity of the proton cyclotron frequency and its harmonics are commonly observed from the Fast Auroral Snapshot spacecraft when traversing regions of auroral particle acceleration. In areas of upward current, large-amplitude electromagnetic waves with frequencies within 5% of the local proton gyrofrequency Ωp and its harmonics are often observed where upstreaming ion beams exist. These waves have electric field (E1) and magnetic field (B1) amplitudes of up to 1 V m-1 and 2 nT with the ratio E1/B1 as small as c. The waves occur in the low-altitude portion of the primary auroral acceleration potential, where plasma densities are <=1 cm-3. It is shown how these waves grow through inverse Landau resonance with a cold field-aligned electron beam superimposed on an accelerated and magnetically mirrored plasma sheet electron component in the absence of any significant plasma densities at energies below ~100 eV. Significantly, the drift velocity of the cold beam (voeb) is several times larger than its thermal velocity veb, and it is this feature that allows the wave to become electromagnetic at cyclotron harmonics while simultaneously giving rise to broadband electrostatic emissions spanning the first few cyclotron harmonics as is observed.

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