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Detailed Reference Information |
Benson, R.F., Webb, P.A., Green, J.L., Garcia, L. and Reinisch, B.W. (2004). Magnetospheric electron densities inferred from upper-hybrid band emissions. Geophysical Research Letters 31: doi: 10.1029/2004GL020847. issn: 0094-8276. |
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The magnetospheric electron density Ne can often be obtained to within a few percent from passive radio-wave dynamic spectra when the electron plasma frequency fpe ($propto$ Ne1/2) is greater than the electron cyclotron frequency fce. This conclusion is based on interleaved active and passive observations from the Radio Plasma Imager (RPI) on the IMAGE satellite in the vicinity of the plasmapause. The Ne determinations are based on the frequency limits of an intense narrowband emission identified as the upper-hybrid band. The lower limit is identified with fpe and the upper limit with the upper-hybrid frequency fuh = (fpe2 + fce2)1/2. These frequency limits and the large amplitude of the emission, typically 20 dB or more above background, suggest strong Z-mode waves, rather than quasi-thermal fluctuations, as the emission source. |
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Abstract |
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Keywords
Magnetospheric Physics, Plasma waves and instabilities, Radio Science, Waves in plasma, Radio Science, Magnetospheric physics |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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