Classification of IMAGE/RPI-Stimulated Plasma Resonances and the Determination of Magnetospheric Electron-Density and Magnetic-Field Values

Details Classification of IMAGE/RPI-Stimulated Plasma Resonances and the Determination of Magnetospheric Electron-Density and Magnetic-Field Values Classification of IMAGE/RPI-Stimulated Plasma Resonances and the Determination of Magnetospheric Electron-Density and Magnetic-Field Values

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm31b0757b&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM31B-0757

Computer Science

Sound

2730 Magnetosphere: Inner, 2731 Magnetosphere: Outer, 2772 Plasma Waves And Instabilities, 6984 Waves In Plasma

Scientific paper

The Radio Plasma Imager (RPI) on the Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) satellite stimulates local plasma resonances. A proper classification of these resonances can be used to accurately deduce both the in situ electron density and the magnetic field strength even in very tenuous plasmas where the former is difficult to measure. Based on many decades of research with ionospheric topside sounders by many investigators, the resonances observed at the harmonics of the electron cyclotron frequency fce, the electron plasma frequency fpe, and the upper-hybrid frequency fuh (where fuh2 = fpe2 + fce2) have been attributed to the reception of electrostatic echoes of the various frequency components of the transmitted sounder pulse. Resonances observed between the fce harmonics, both above and below fpe, have different interpretations that involve (in some cases) sounder-stimulated plasma emissions. We will show that all of the above resonances are also observed by RPI in the magnetosphere and we will demonstrate the importance of using all three of the RPI mutually orthogonal dipole receiving antennas for investigating them. In particular, it will be shown that the classification of the ionospheric resonances observed between the fce harmonics and below fpe, designated as the Dn resonances, also applies to the magnetosphere and provides a valuable diagnostic tool for the interpretation of high-resolution RPI plasmagrams revealing rich plasma-resonance spectra.

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