Broadband transverse waves below 1 Hz in the afternoon sector of the magnetosphere

Details Broadband transverse waves below 1 Hz in the afternoon sector of the magnetosphere Broadband transverse waves below 1 Hz in the afternoon sector of the magnetosphere

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10618873m&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue A9, p. 18873-18882

Physics

Magnetospheric Physics: Magnetosphere-Outer, Magnetospheric Physics: Plasma Waves And Instabilities

Scientific paper

We present an observation of broadband transverse waves (BTW) below 1 Hz in the afternoon sector of the magnetosphere at about L~10. We find that the BTW correlate well with density enhancements and bidirectional electron flows. Characteristics of the BTW are summarized as follows. The wave amplitude varies within a few periods, which results in a broad frequency band in the Fourier spectra. Only perturbations transverse to the background magnetic field are observed. The amplitude ratio of electric to magnetic field fluctuations is close to the local Alfvén speed, so that the wave mode is suggested to be Alfvén waves. The Poynting flux is directed away from the equatorial region toward the ionosphere. We have assessed various resonance mechanisms (Landau resonance, cyclotron resonance, and resonance with bouncing electrons) but find that none gives a compelling interpretation of the observation, which thus requires future study.

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