Evaluation of Whistler-Mode Chorus Intensification on the Nightside During an Injection Event Observed on the THEMIS Spacecraft

Details Evaluation of Whistler-Mode Chorus Intensification on the Nightside During an Injection Event Observed on the THEMIS Spacecraft Evaluation of Whistler-Mode Chorus Intensification on the Nightside During an Injection Event Observed on the THEMIS Spacecraft

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm42a..04l&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM42A-04

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 nightside 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. THEMIS ESA data of the electron phase space density (PSD) over the energy range between 0.1 keV and 30 keV are used to develop an analytical model for the distribution of injected suprathermal electrons. The path-integrated gain of chorus waves is then evaluated with the HOTRAY code by tracing whistler-mode chorus waves in a hot magnetized plasma. The simulated wave gain is compared to the observed wave electric field and magnetic field from EFI and SCM respectively. The results indicate that lower-energy (<1keV) plasmasheet electrons can penetrate deeper towards the Earth but cause little chorus intensification, while higher-energy (1keV- tens of keV) electrons can be injected at relatively higher L-shells and are responsible for the intensification of lower-band and upper-band whistler-mode chorus. Compared to lower-band chorus, relatively higher electron anisotropy is required to generate upper-band chorus. In addition, higher plasma density results in stronger wave intensity and broader frequency band of chorus waves.

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