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Detailed Reference Information |
Gough, M.P., Burke, W.J., Hardy, D.A., Huang, C.Y., Gentile, L.C., Rubin, A.G., Oberhardt, M.R., Drobot, A.T., Thompson, D.C. and Raitt, W.J. (1998). Megahertz electron modulations during TSS 1R. Geophysical Research Letters 25: doi: 10.1029/97GL03002. issn: 0094-8276. |
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Experiments were conducted during the Tethered Satellite System Reflight in which a 1 keV, 100 mA electron beam was emitted from the shuttle at pitch angles near 90¿. Rapid plasma responses measured by the Shuttle Potential and Return Electron Experiment (SPREE) show time-modulated electron fluxes within the beam flux tube. Megahertz modulations fall into two classes: (1) narrow-bands close to harmonics of the electron gyrofrequency fce and (2) broad-bands at interharmonic frequencies in which electrons of different energies had different modulation frequencies. When SPREE intercepted beam electrons after a single gyroturn they, too, were modulated at similar frequencies. Data suggest that beam electrons were modulated by strong plasma interactions near the emission aperture, generating time-varying electric fields that modulated other electrons near the beam cylinder. This is analogous to the electron cyclotron maser responsible for auroral kilometric radiation. ¿ 1998 American Geophysical Union |
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BACKGROUND DATA FILES |
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Abstract |
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Keywords
Ionosphere, Active experiments, Ionosphere, Wave/particle interactions, Ionosphere, Instruments and techniques, Space Plasma Physics, Wave/particle interactions |
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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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