Physics – Plasma Physics
Scientific paper
Sep 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1253c&link_type=abstract
Journal of Geophysical Research (Space Physics), Volume 107, Issue A9, pp. SIA 5-1, CiteID 1253, DOI 10.1029/2001JA005082
Physics
Plasma Physics
9
Ionosphere: Active Experiments, Ionosphere: Instruments And Techniques, Radio Science: Nonlinear Phenomena, Space Plasma Physics: Radiation Processes
Scientific paper
The frequency of a high-power HF radio wave incident on the ionosphere was swept, using a computer-controlled transmitter signal, in <10 s within a 60-kHz-wide frequency band approximately centered on the fourth harmonic of the electron cyclotron frequency. Measurements of the spectral behavior of stimulated electromagnetic emissions (SEE) across this harmonic after preconditioning could thereby be made with unprecedented resolution, speed, and ionospheric stability. Comparison of local electron cyclotron frequency estimations based on the experimental data reveals discrepancies between certain downshifted maximum models and the empirical broad upshifted maximum (BUM) feature formula ΔfBUM = f0 - nfce. Weak emissions related to the BUM were discovered below the nominal BUM cutoff frequency. Finally, we observed that the intensity of certain SEE components differed depending on the whether the pump frequency sweep was ascending or descending.
Carozzi Tobia D.
Frolov Vladimir L.
Grach S. M.
Holz Michael
Komrakov Georgy P.
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