Generation of Chorus Waves and Their Effects on Electrons

Details Generation of Chorus Waves and Their Effects on Electrons Generation of Chorus Waves and Their Effects on Electrons

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm33a1763s&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM33A-1763

Physics

2730 Magnetosphere: Inner, 2753 Numerical Modeling, 2772 Plasma Waves And Instabilities (2471), 7829 Kinetic Waves And Instabilities, 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

Chorus emissions that propagate in the whistler wave band are observed in the inner magnetosphere and may play a role in the acceleration of electrons. To understand how these waves are generated and what their effects are on electrons, a study has been carried out using Cluster satellite observations and particle in cell simulations. The WBD, STAFF, and Whisper instruments onboard Cluster have made observations of chorus waves within the source region in the near-Earth magnetosphere and the PEACE electron instrument has shown the presence of multiple electron species with different temperature from cool (10's eV), to warm (100's eV) to hot (> keV). The warm species is highly anisotropic with perpendicular temperature 10 times the parallel temperature, which can provide the free energy for whistler wave generation. Using the wave and electron observations made in the source region, a linear theory and simulation study has been undertaken. Linear theory shows that the observed electron species are unstable to whistler waves at frequencies greater than 0.5 times the electron gyrofrequency, but less the electron gyrofrequency. To understand how the instability saturates and the ensuing wave-particle interactions, a Darwin electromagnetic particle in cell simulation study has been carried out using observed parameters. The effects of the whistler waves (i.e., chorus) on electrons and the implications for the radiation belt region will be discussed.

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