Magnetospheric Banded Emissions: Their Distribution, Amplitude and Frequency Shifts, and Ambient Plasma and Cyclotron Frequencies as Determined by IMAGE/RPI

Details Magnetospheric Banded Emissions: Their Distribution, Amplitude and Frequency Shifts, and Ambient Plasma and Cyclotron Frequencies as Determined by IMAGE/RPI Magnetospheric Banded Emissions: Their Distribution, Amplitude and Frequency Shifts, and Ambient Plasma and Cyclotron Frequencies as Determined by IMAGE/RPI

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm11b0322b&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM11B-0322

Physics

6939 Magnetospheric Physics (2700), 6984 Waves In Plasma (7867), 7599 General Or Miscellaneous, 7839 Nonlinear Phenomena (4400, 6944), 7899 General Or Miscellaneous

Scientific paper

Magnetospheric banded emissions were investigated using both a statistical analysis and by performing detailed case studies with an emphasis on the dynamics near the magnetic equator. An algorithm to automatically search radio-wave dynamic spectra was used to determine the number of bands detected, their spatial distribution and the ambient plasma conditions in the emission generation regions. The algorithm was applied to Jan 2001 - August 2004 data from the Radio Plasma Imager (RPI) on the IMAGE satellite. The statistical results indicated that when the electron plasma frequency could be determined the banded emissions were most common when (1) the electron plasma to cyclotron frequency ratio was between 7 and 8, (2) the L value was between 5 and 8, (3) the magnetic local time was between 15 and 16 hours, (4) the radial distance was between 5.5 and 7 Earth radii, and (4) IMAGE was located near the magnetic equator but there was a tendency for banded emissions to be observed more often at positive than at negative magnetic latitudes. The case studies indicated that (1) the sudden onset of banded emissions corresponds to a rapid drop in the electron plasma to cyclotron frequency ratio, (2) large positive frequency deviations in the banded emissions from values near the midpoints between the electron cyclotron harmonics occur near the magnetic equator, (3) these frequency increases correlate with large amplitude increases suggesting nonlinear processes.

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