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Blagoveshchenskaya et al. 1998

Blagoveshchenskaya, N.F., Kornienko, V.A., Rietveld, M.T., Thidé, B., Brekke, A., Moskvin, I.V. and Nozdrachev, S. (1998). Stimulated emissions around second harmonic of Tromsø heater frequency observed by long-distance diagnostic HF tools. Geophysical Research Letters 25: doi: 10.1029/98GL00492. issn: 0094-8276.

Observations of stimulated electromagnetic emission (SEE) around the second harmonic of Troms¿ heater frequency carried out by long-distance diagnostic HF tools are presented. Diagnostic tools are located at a distance of 1200 km from the Troms¿ HF heater. Observed SEE spectra show: (1) spectral broadening up to 30 kHz; (2) frequency shift of the maximum amplitude in the SEE spectra from the heater second harmonic frequency 8080 kHz by 16--20 kHz; (3) dependence of the maximum amplitude on the heater power level. The detected features in the SEE spectra have not been observed before in ionospheric heating experiments and may be the second harmonic of the downshifted maximum. The strongest candidate is the coalescense (head-on collisions) of Langmuir waves produced in the heated volume. ¿ 1998 American Geophysical Union

BACKGROUND DATA FILES

	Abstract

Keywords
Ionosphere, Active experiments, Radio Science, Nonlinear phenomena, Space Plasma Physics, Nonlinear phenomena, Space Plasma Physics, Neutral particles

Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/

Publisher
American Geophysical Union
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