Source regions of banded chorus

Details Source regions of banded chorus Source regions of banded chorus

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3611101b&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 11, CiteID L11101

Physics

6

Radio Science: Waves In Plasma (7867), Magnetospheric Physics: Plasma Waves And Instabilities (2471), Radio Science: Magnetospheric Physics (2700), Radio Science: Radio Wave Propagation, Magnetospheric Physics: Energetic Particles: Trapped

Scientific paper

ELF/VLF chorus emissions are very intense electromagnetic plasma waves that are naturally and spontaneously excited near the magnetic equatorial plane outside the plasmasphere during periods of magnetic disturbance. These emissions are believed to play an important role in the acceleration of 10 to 100 keV radiation belt electrons to MeV energies during the disturbed time periods. Spacecraft observations near the magnetic equatorial plane in the regions where chorus emissions are generated show that the chorus often appears in two distinct frequency bands, one band below f ce /2 and one band above f ce /2, where f ce is the local electron gyrofrequency. This configuration is known as banded chorus. In the present paper we show that this type of configuration can be readily explained if it is assumed that the chorus is excited in ducts of either enhanced or depleted cold plasma density.

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