Physics
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9410111d&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Aug. 1, 1989, p. 10111-10120. Research supported by the Naturvetenska
Physics
17
Harmonic Generations, High Frequencies, Ionospheric Heating, Radio Frequency Heating, Stimulated Emission, Arctic Regions, Norway, Plasmons, Radio Transmitters, Raman Spectra, Space Plasmas
Scientific paper
Observations of electromagnetic emissions on the HF heater subharmonic and several harmonic frequencies are presenteed. Often the second harmonic emissions show characteristic amplitude variation, frequency shift, and spectral broadening that clearly have their origin in ionospheric plasma processes. The strongest candidate is a combined parametric decay and Raman up-conversion process. The subharmonic emission is believed to be evidence of absolute stimulated Raman scattering and/or two plasmon decay processes which have not been observed before in ionospheric heating experiments.
Derblom Harald
Hedberg Ake
Leyser T. B.
Nordling Johan A.
Thidé Bo
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