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| Titel |
Stimulated Brillouin scattering during electron gyro-harmonic heating at EISCAT |
| VerfasserIn |
H. Y. Fu, W. A. Scales, P. A. Bernhardt, S. J. Briczinski, M. J. Kosch, A. Senior, M. T. Rietveld, T. K. Yeoman, J. M. Ruohoniemi |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 33, no. 8 ; Nr. 33, no. 8 (2015-08-11), S.983-990 |
| Datensatznummer |
250121231
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| Publikation (Nr.) |
 copernicus.org/angeo-33-983-2015.pdf |
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| Zusammenfassung |
| Observations of secondary radiation, stimulated electromagnetic emission
(SEE), produced during ionospheric modification experiments using
ground-based, high-power, high-frequency (HF) radio waves are considered. The
High Frequency Active Auroral Research Program (HAARP) facility is capable of
generating narrowband SEE in the form of stimulated Brillouin scatter (SBS) and
stimulated ion Bernstein scatter (SIBS) in the SEE spectrum. Such narrowband
SEE spectral lines have not been reported using the European Incoherent
Scatter (EISCAT) heater facility before. This work reports the first EISCAT
results of narrowband SEE spectra and compares them to SEE previously
observed at HAARP during electron gyro-harmonic heating. An analysis of
experimental SEE data shows observations of emission lines within
100 Hz of the pump frequency, interpreted as SBS, during the 2012
July EISCAT campaign. Experimental results indicate that SBS strengthens as
the pump frequency approaches the third electron gyro-harmonic. Also, for
different heater antenna beam angles, the CUTLASS radar backscatter induced
by HF radio pumping is suppressed near electron gyro-harmonics, whereas
electron temperature enhancement weakens as measured by EISCAT/UHF radar. The
main features of these new narrowband EISCAT observations are generally
consistent with previous SBS measurements at HAARP. |
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