Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm31c..08k&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM31C-08
Physics
[2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2774] Magnetospheric Physics / Radiation Belts, [6939] Radio Science / Magnetospheric Physics
Scientific paper
VLF waves play a crucial role in the dynamics of the radiation belts, being responsible for loss and energization of energetic electrons. Modelling of wave-particle interactions requires the best possible knowledge of how the wave energy and wave-normal directions are distributed in L-shells and magnetic latitudes for different magnetic activity conditions. We perform a statistical study of VLF emissions in a whistler frequency range using nine years (2001-2009) of Cluster measurements. We use data from the STAFF-SA experiment which covers frequency range from 8.8 Hz up to 3.56 kHz. We show that the wave energy distributions have two maxima around 4,5 < L < 6 and L > 2. We find that the wave-normals are directed approximately along B in the vicinity of the geomagnetic equator. The distribution changes with the magnetic latitude, and at latitudes ~ 30 degrees the wave normals distribution has its maximum close to nearly perpendicular to B. The observed angular distribution is significantly different from the Gaussian and the width of the distribution increases with the latitude. As the resonance conditions for wave-particle interaction depends on the wave normal orientation, our results demonstrate that due to the observed change of the wave normal direction with latitude the most efficient particle diffusion due to wave-particle interaction should occur in a limited region around the geomagnetic equator.
Agapitov Oleksiy
Khotyaintsev Yu. V.
Krasnoselskikh Vladimir
Rolland Guillaume
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