Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm53b1371b&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM53B-1371
Physics
[0624] Electromagnetics / Guided Waves, [2720] Magnetospheric Physics / Energetic Particles: Trapped, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2774] Magnetospheric Physics / Radiation Belts
Scientific paper
ELF/VLF chorus emissions are very intense electromagnetic plasma waves that are spontaneously excited near the magnetic equatorial plane beyond 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 chorus generation region show that the chorus often appears in two distinct frequency bands, one band below one half of the equatorial electron gyrofrequency, and one band above one half of the equatorial electron gyrofrequency. It has recently been suggested [Bell, et al., 2009] that this frequency banded structure can be readily explained if it is assumed that the chorus is excited within ducts of either enhanced or depleted cold plasma density. In the present work we consider the propagation characteristics of chorus within both two-sided and one-sided ducts of either enhanced or depleted cold plasma density and compare the predicted distribution of chorus waves with CLUSTER spacecraft observations.
Bell Timothy F.
Haque Najmul
Inan Umran S.
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