Stimulated Brillouin scattering during electron gyro-harmonic heating at EISCAT

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dc.contributor.authorFu, H. Y.en
dc.contributor.authorScales, Wayne A.en
dc.contributor.authorBernhardt, P. A.en
dc.contributor.authorBriczinski, S. J.en
dc.contributor.authorKosch, M. J.en
dc.contributor.authorSenior, A.en
dc.contributor.authorRietveld, Michael T.en
dc.contributor.authorYeoman, T. K.en
dc.contributor.authorRuohoniemi, J. Michaelen
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessioned2019-10-17T13:36:31Zen
dc.date.available2019-10-17T13:36:31Zen
dc.date.issued2015en
dc.description.abstractObservations of secondary radiation, stimulated electromagnetic emission (SEE), produced during ionospheric modification experiments using ground-based, highpower, 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.en
dc.description.notesThe authors would like to acknowledge Inge-mar Haggstrom for access to EISCAT UHF radar data analysis and the staff at the EISCAT facility for technical support. The work at Virginia Tech was supported in part by the National Science Foundation. The work at the Naval Research Laboratory was sponsored by the NRL 6.1 Base programme. The work at Fudan University was supported in part by National Science Foundation of China (NSFC no. 41404122). The authors highly appreciate the constructive comments from the referees.en
dc.description.sponsorshipNational Science FoundationNational Science Foundation (NSF); NRL 6.1 Base programme; National Science Foundation of China (NSFC)National Natural Science Foundation of China [41404122]; Natural Environment Research CouncilNERC Natural Environment Research Council [NE/K011766/1]; Science and Technology Facilities CouncilScience & Technology Facilities Council (STFC) [ST/K001000/1, ST/G00241X/1]en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.5194/angeo-33-983-2015en
dc.identifier.eissn1432-0576en
dc.identifier.issn0992-7689en
dc.identifier.issue8en
dc.identifier.urihttp://hdl.handle.net/10919/94617en
dc.identifier.volume33en
dc.language.isoenen
dc.publisherEuropean Geosciences Unionen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectIonosphereen
dc.subjectactive experimentsen
dc.subjectparticle accelerationen
dc.subjectplasma waves and instabilitiesen
dc.titleStimulated Brillouin scattering during electron gyro-harmonic heating at EISCATen
dc.title.serialAnnales Geophysicaeen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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