Physics – Plasma Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm51b0371v&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM51B-0371
Physics
Plasma Physics
7800 Space Plasma Physics, 6984 Waves In Plasma, 2471 Plasma Waves And Instabilities, 2772 Plasma Waves And Instabilities
Scientific paper
The Radio Plasma Imager (RPI) on the Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) satellite stimulates short-range plasma wave echoes and plasma emissions, known as plasma resonances, detected on plasmagrams. These resonances are used to provide measurements of the local electron density ne and magnetic field strength |B|. The RPI-stimulated resonances are the magnetospheric analog of plasma resonances stimulated by topside ionospheric sounders. These resonances are stimulated at the harmonic of the electron cyclotron frequency fce, the electron plasma frequency fpe and the upper-hybrid frequency fuh (where fuh2 = fpe2 + fce2). They are also observed between the harmonics of fce (i.e., n fce) both above and below fpe and are known as the Qn and Dn resonances, respectively. In this work we solely focus on the Qn resonances. Calculations of these resonances in the ionospheric environment, based upon a thermal Maxwellian plasma model provided confidence in the resonance identification. There is an apparent difference however, between the ob-served Qn resonances and calculations based on a Maxwellian plasma model in the magnetosphere environment. For example, the Qn's are often (and perhaps consistently) observed at frequencies slightly lower than expected for a Maxwellian plasma. We present a new set of resonance calculations based upon the non-thermal kappa distribution that provides dispersion characteristics of these resonances. Comparisons of these calculations to the IMAGE/RPI observations seems to resolve the frequency discrepancy. The results also provide insight into the nature of the electron distribution function in the magnetosphere.
Benson Robert F.
Mace Richard L.
Viñas Adolfo F.
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