Statistical Analysis of the Global Distribution of Electrons for the Chorus Generation Observed on the THEMIS Spacecraft

Details Statistical Analysis of the Global Distribution of Electrons for the Chorus Generation Observed on the THEMIS Spacecraft Statistical Analysis of the Global Distribution of Electrons for the Chorus Generation Observed on the THEMIS Spacecraft

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm21a1660l&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM21A-1660

Physics

2730 Magnetosphere: Inner, 2772 Plasma Waves And Instabilities (2471), 2774 Radiation Belts, 6984 Waves In Plasma (7867), 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

The intensification of the whistler-mode chorus emissions is observed in the low-density region outside the plasmapause during the injection of anisotropic plasmasheet electrons into the inner magnetosphere. A statistical analysis is performed to provide the global distribution of chorus waves and electrons in the energy range of 0.1-100keV near the equatorial plane using the data measured with ESA from the THEMIS spacecraft. The electron flux and corresponding electron anisotropy are categorized via different levels of the chorus intensity at different MLT and L-shells. Electron distribution data are also sorted by various energy ranges of 0.1-1keV, 1-30keV, and 30-100keV in order to identify the energy of electrons, which play a most important role in chorus generation. The results show that chorus waves are generated by the injection of electrons with the energy of a few keV and tens of keV and stronger chorus waves are associated with higher electron flux and larger electron anisotropy. In addition, compared to the nightside, electron flux is lower and the anisotropy is higher on the dayside.

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