Chorus emissions measured by Cluster spacecraft at different L-shells

Details Chorus emissions measured by Cluster spacecraft at different L-shells Chorus emissions measured by Cluster spacecraft at different L-shells

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm14b..07m&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM14B-07

Physics

Plasma Physics

[2772] Magnetospheric Physics / Plasma Waves And Instabilities, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

Whistler mode chorus emissions are intense magnetospheric waves composed of discrete wave packets with variable frequencies that sometimes change into shapeless hiss. Chorus probably accelerates electrons in the outer radiation belts to energies greater than 1 MeV through wave-particle interactions. Chorus wave packets usually consist of rising tones, but falling tones and more complicated structures have also been observed. Measurements provided by Wideband and STAFF-SA instruments onboard Cluster spacecraft give us information about the source region, propagation and spectral structures. Previous measurements of Cluster spacecraft show that most of the intense chorus can be found at L-shells between 4 and 5, but recent studies based on Themis and Double Star TC-1 observations provide evidence of intense emissions at much larger L-shells. Owing to a recent change of the Cluster orbit we can observed chorus over a larger range of radial distances. We observe banded chorus with a gap localized at the one half of electron cyclotron frequency close to the geomagnetic equator in entire L-shell interval between 4 and 10. We show the influence of the L-shell on spectral shapes and intensity of chorus emissions.

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