Observations of VHF emissions from 50-mA electron beam injections in the ionosphere that are associated with beam-induced discharges
| Autor: | H. R. Anderson, Paul J. Kellogg, E. P. Szuszczewicz, Steven J. Monson, W. F. Denig, R. J. Nemzek, R. T. Goerke, G. D. Earle, D. W. Potter, R. C. Franz |
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| Rok vydání: | 1992 |
| Předmět: |
Physics
Atmospheric Science Luminosity (scattering theory) Ecology business.industry Paleontology Soil Science Forestry Electron Aquatic Science Oceanography Wavelength Geophysics Optics Space and Planetary Science Geochemistry and Petrology Earth and Planetary Sciences (miscellaneous) Cathode ray Emission spectrum Ionosphere business Beam (structure) Earth-Surface Processes Water Science and Technology Electron gun |
| Zdroj: | Journal of Geophysical Research. 97:1319 |
| ISSN: | 0148-0227 |
| DOI: | 10.1029/91ja02431 |
| Popis: | Results are presented of observations of strong VHF plasma waves with amplitudes in excess of 0.1 mV/m (Hz)1/2 associated with 50 mA electron beam injections in the ionosphere. Data from three swept-frequency receivers carried on two daughter payloads are analyzed to determine the emission spectra of the electron beam for various energies and currents. These results were obtained from the rocket-borne experiment SCEX 3, NASA flight 39.002 UE, launched February 1, 1990. The accelerator payload also carried photometers, which measured luminosity at wavelengths of 391.4 and 380.5 nm. Several times during electron gun activity the measured luminosity increased much faster than proportional to the beam current. This nonlinear increase is evidence that a discharge is occurring in the vicinity of the accelerator payload. It is inferred from the uniform distribution of the luminosity around the accelerator payload that the observed discharge extends significantly outside the beam cylinder. |
| Databáze: | OpenAIRE |
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