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Detailed Reference Information |
Fejer, J.A., Sulzer, M.P. and Djuth, F.T. (1991). Height dependence of the observed spectrum of radar backscatter from HF-induced ionospheric Langmuir turbulence. Journal of Geophysical Research 96: doi: 10.1029/91JA00565. issn: 0148-0227. |
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Observations of the spectrum of 430-MHz radar backscatter from HF-induced Langmuir turbulence with height discrimination are described. During very stable ionospheric conditions under which the height of the below-threshold backscatter spectrum had changed by less than 300 m during a 7-min period, a 20-s-long temporary increase in the HF power from 3 MW ERP to 38 MW equivalent radiated HF power resulted in subsequent strong above-threshold spectra extending to heights up to 1200 m greater than the height of the below-threshold spectrum for more than a minute. The generation of irregularities in the plasma density during the 20 s of enhanced HF power is suggested as a possible cause of this persistance of strong above-threshold spectra at greater heights. The initial temporal evolution of the backscatter spectrum from Langmuir turbulence after the start of HF transmissions was observed for different heights. The observational results are compared with the predictions of existing theories of Langmuir turbulence. ¿American Geophysical Union 1991 |
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Abstract |
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Keywords
Ionosphere, Active experiments, Space Plasma Physics, Active perturbation experiments, Space Plasma Physics, Nonlinear phenomena, Space Plasma Physics, Waves and instabilities, Ionosphere |
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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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