Physics – Plasma Physics
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...104..293l&link_type=abstract
Journal of Geophysical Research, Volume 104, Issue A1, p. 293-304
Physics
Plasma Physics
5
Magnetospheric Physics: Plasma Waves And Instabilities, Space Plasma Physics: Waves And Instabilities, Radio Science: Waves In Plasma
Scientific paper
Satellite wave instruments commonly detect banded magnetospheric emissions between harmonics of the electron gyrofrequency fce in the outer magnetosphere. To complement an earlier statistical study on the amplitude of these emissions, we investigate the statistical properties of their frequencies by identifying the spectral peaks in 193 sample spectra observed with the Active Magnetospheric Particle Tracer Experiment/Ion Release Module (AMPTE/IRM), normalizing these peaks to fce as determined by the onboard magnetometer, and plotting them against the ratio of the plasma to gyrofrequency fpe/fce where fpe was determined from the onboard particle or wave instrument. A histogram of the spectal peaks normalized by fce reveals well-defined peaks between harmonics of fce. In this histogram, as well as in individual spectra, the higher-frequency peaks tend to occur closer to the electron gyroharmonic than do the lower-frequency peaks. In about 15% of the spectra sampled, more than one peak was observed between gyroharmonics. The statistics also suggest that the banded emissions shift downward in normalized frequency with increasing fpe/fce, although this observation is subject to the considerable uncertainty in the measured fpe. These trends may be consistent with several wave generation mechanisms such as excitation of electron Bernstein modes destabilized by non-Maxwellian magnetospheric electron distributions.
LaBelle James
Ruppert D. R.
Treumann Rudolf A.
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