Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm51d..03s&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM51D-03
Physics
2730 Magnetosphere: Inner, 2753 Numerical Modeling, 2772 Plasma Waves And Instabilities (2471)
Scientific paper
Chorus waves with frequencies below the electron gyrofrequency (fce) are observed in the inner radiation belt 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 numerical 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 of different temperature from cold (10's eV), to warm (100's eV) to hot (> keV). The warm species is highly anisotropic with perpendicular temperature as much as 10 times the parallel temperature. Using the electron observations made in the generation 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 in the range 0.7-0.8 fce. To understand how the instability saturates and the ensuing wave-particle interactions, an electromagnetic particle in cell simulation study has been carried out using observed parameters. The effects the chorus waves have on electrons and the implications for the radiation belt region will be discussed.
Ashour-Abdalla Maha
David Winningham J.
Goldstein Michel L.
Leboeuf J.
Pickett Jolene S.
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