Diagnosis of Spatial Plasmas with a Relaxation Sounder
Study of waves with low group velocities has allowed us to make a detailed interpretation of the signals reflected back from a plasma excited by a relaxation sounder. Study of the frequency and amplitude development of these waves in the vicinity of the characteristic frequencies of the medium (gyrofrequency and harmonics, upper hybrid frequency and plasma frequency) leads to determination of such plasma parameters as modulus of magnetic field, electron density, and temperature. Results obtained by this means from three rocket experiments launched under differing ionospheric conditions are presented. Similar experiments will be flown aboard GEOS and ISEE-A and the interpretative techniques described here will enable us to determine the characteristics of the plasma surrounding the spacecraft.
KeywordsGroup Velocity Plasma Frequency Beat Frequency Plasma Resonance Index Curve
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- Bitoun, J., L. Fleury & B. Higel, Theoretical study of gyroresonances with application to rocket experiments, Radio Sci., 1975.Google Scholar
- Gaffey, JD. Jr. & RE. Laquey, Upper hybrid resonance in the magnetosphere, Submitted to J. Geophys. Res., 1975.Google Scholar
- Higel, B., Non stationnarité des signaux de résonance des plasmas ionosphérique et magnétosphérique, Ann. Télécom., 1975.Google Scholar
- McAfee, J.R., Electron plasma resonances in the topside ionosphere. Fundamentals of Cosmic Physics, Vol. 1, 71–118, Gordon and Breach Ltd., 1973.Google Scholar
- Petit, M., J. Bitoun, R. Feldstein, P. Graff & B. Higel, Ondes de plasma à vitesse de groupe faible, Ann. Télécom. 27, 417–429 (1972).Google Scholar