Relating Magnetospheric Passive Dynamic Spectral Emission Peaks to Plasma and Upper-Hybrid Frequencies Determined from Active RPI Sounding on IMAGE

Details Relating Magnetospheric Passive Dynamic Spectral Emission Peaks to Plasma and Upper-Hybrid Frequencies Determined from Active RPI Sounding on IMAGE Relating Magnetospheric Passive Dynamic Spectral Emission Peaks to Plasma and Upper-Hybrid Frequencies Determined from Active RPI Sounding on IMAGE

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm21a..06b&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM21A-06

Computer Science

Sound

2730 Magnetosphere: Inner, 2731 Magnetosphere: Outer, 2768 Plasmasphere, 2772 Plasma Waves And Instabilities, 2794 Instruments And Techniques

Scientific paper

The electron density is often derived from an intense narrowband emission on passive radio-wave dynamic spectra. The derivation is usually based on the assumption that the peak in this emission either corresponds to the electron plasma frequency fpe or the upper-hybrid frequency fuh which is related to fpe and the electron cyclotron frequency fce by the expression fuh2 = fpe2 + fce2. The Radio Plasma Imager (RPI) on the Imager for Magnetopause-to-Aurora Global Exploration (IMAGE ) satellite provides an ideal opportunity to investigate the relationship of this peak to fpe and fuh. Plasma resonances and wave cutoffs stimulated by RPI active soundings during 5 plasmapause crossings were used to make accurate (within a few %) determinations of fpe and fuh. These values were then related to the observed emission peaks in the dynamic spectra obtained during passive RPI operations (interspersed among the active soundings) as a function of the ambient fpe}/f{ce value. While it was found that the peak can occur at either fpe or fuh (more often at fpe), it often occurred between fpe and fuh. It is typically within 5% of fpe or fuh for large fpe}/f{ce (~ 4) and within 20% for smaller fpe}/f{ce (< 3).

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