Physics – Plasma Physics
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...10410081p&link_type=abstract
Journal of Geophysical Research, Volume 104, Issue A5, p. 10081-10088
Physics
Plasma Physics
21
Ionosphere: Active Experiments, Ionosphere: Ionospheric Irregularities, Ionosphere: Plasma Waves And Instabilities, Space Plasma Physics: Active Perturbation Experiments
Scientific paper
Experimental results of resonant high-frequency (HF) scattering from small-scale geomagnetic field-aligned plasma irregularities excited by electromagnetic HF pumping of the ionospheric F region from the Sura radio facility in Russia are reported. These results include the first observations of a minimum in the scattered signal intensity when the pump frequency was near the fourth electron gyroharmonic and of a significant broadening of the frequency spectrum of the scattered signal for pump frequencies above the gyroharmonic. After pump-off, the flanks of the broad spectrum decayed rapidly. These new observations link together several previous experimental results of gyroharmonic effects in phenomena attributed to the excitation of small-scale field-aligned irregularities and are therefore thought to be significant contributions to our understanding of the self-organization of the space plasma under the action of an external perturbation.
Leyser T. B.
Ponomarenko Pavlo V.
Thidé Bo
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