Modeling the excitation and global distribution of magnetospheric chorus emissions

Details Modeling the excitation and global distribution of magnetospheric chorus emissions Modeling the excitation and global distribution of magnetospheric chorus emissions

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm22a..04t&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM22A-04

Physics

[2772] Magnetospheric Physics / Plasma Waves And Instabilities

Scientific paper

Magnetospheric chorus emissions play a fundamental role in governing the dynamics of the Earth's radiation belts and the global distribution of diffuse auroral precipitation from the plasma sheet. However, despite its importance, the precise mechanism for the origin of this magnetospheric emission remains a mystery. Significant progress has recently been made in understanding the basic theoretical processes leading to both linear and non-linear wave growth. Observations from THEMIS spacecraft have also been used to determine the global distribution of chorus, its dominant spectral and polarization characteristics, and also identify macroscopic changes in the plasma medium that lead to wave triggering. Chorus-induced scattering of plasma sheet electrons, which are injected into the inner magnetosphere during enhanced convection or substorms, leads to characteristic changes in the trapped electron pitch-angle distribution and diffuse auroral precipitation. Such scattering also leaves the low-energy electron population in a marginally stable state. Based on the recent theoretical and observational progress a model is developed, which accounts for the dominant characteristics of both nightside and dayside chorus, their dependence on geomagnetic activity, and the triggering of whistler-mode instability on a global scale by macroscopic plasma features.

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