Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa51a1919l&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA51A-1919
Physics
[2700] Magnetospheric Physics, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2774] Magnetospheric Physics / Radiation Belts, [2790] Magnetospheric Physics / Substorms
Scientific paper
The VLF signal enhancements after substorm onsets are regarded as a signature of the Substorm-related Chorus Events (SCEs), which therefore carry information on the energetic electrons injected during substorms. We have searched for such SCEs detected by the VLF receivers of the Automatic Geophysical Observatories (AGO) of the US Polar Experiment Network for Geospace Upper-atmosphere Investigations (PENGUIn) network to find out various patterns of the VLF time profiles at three channels: 0.5-1 kHz, 1-2 kHz, and 2-4 kHz, respectively. We then used these as constraints in a test particle simulation in which electrons drift under the influence of convective and inductive electric fields and magnetic gradient and curvature in the dipole field while undergoing radial diffusion as well, and amplify local whistler waves at the linear wave growth rate. In our result, the detailed characteristics of the VLF time profiles are mostly determined by injection properties, although the general trend of frequency dependent delay of the peak intensity can be explained by the energy-dispersive drift of the electrons. It is suggested that time profiles of the groundbased VLF signals can be used as a diagnostic tool for electron drift motion in the radiation belt.
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