Stimulated Brillouin scattering during electron gyro-harmonic heating at EISCAT
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 gener...
Published in: | Annales Geophysicae |
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Online Access: | http://www.ann-geophys.net/33/983/2015/angeo-33-983-2015.html http://hdl.handle.net/2381/35968 https://doi.org/10.5194/angeo-33-983-2015 |
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ftleicester:oai:lra.le.ac.uk:2381/35968 2023-05-15T16:04:10+02:00 Stimulated Brillouin scattering during electron gyro-harmonic heating at EISCAT Fu, H. Y. Scales, W. A. Bernhardt, P. A. Briczinski, S. J. Kosch, M. J. Senior, A. Rietveld, M. T. Yeoman, Timothy Kenneth Ruohoniemi, J. M. 2015-11-30T11:34:24Z http://www.ann-geophys.net/33/983/2015/angeo-33-983-2015.html http://hdl.handle.net/2381/35968 https://doi.org/10.5194/angeo-33-983-2015 en eng European Geosciences Union (EGU) Annales Geophysicae, 2015, 33 (8), pp. 983-990 (8) 0992-7689 http://www.ann-geophys.net/33/983/2015/angeo-33-983-2015.html http://hdl.handle.net/2381/35968 doi:10.5194/angeo-33-983-2015 1432-0576 Copyright © Author(s) 2015. This work is distributed under the Creative Commons Attribution 3.0 License ( http://creativecommons.org/licenses/by/3.0/ ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. CC-BY Science & Technology Physical Sciences Astronomy & Astrophysics Geosciences Multidisciplinary Meteorology & Atmospheric Sciences Geology Ionosphere active experiments particle acceleration plasma waves and instabilities ELECTROMAGNETIC EMISSION-SPECTRUM ION GYROHARMONIC STRUCTURES IONOSPHERIC PLASMA PUMP FREQUENCIES DOWNSHIFTED PEAK HF RADIATION INSTABILITY FEATURES CUTLASS Journal Article Article;Journal 2015 ftleicester https://doi.org/10.5194/angeo-33-983-2015 2019-03-22T20:21:14Z 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. Peer-reviewed Publisher Version Article in Journal/Newspaper EISCAT University of Leicester: Leicester Research Archive (LRA) Annales Geophysicae 33 8 983 990 |
institution |
Open Polar |
collection |
University of Leicester: Leicester Research Archive (LRA) |
op_collection_id |
ftleicester |
language |
English |
topic |
Science & Technology Physical Sciences Astronomy & Astrophysics Geosciences Multidisciplinary Meteorology & Atmospheric Sciences Geology Ionosphere active experiments particle acceleration plasma waves and instabilities ELECTROMAGNETIC EMISSION-SPECTRUM ION GYROHARMONIC STRUCTURES IONOSPHERIC PLASMA PUMP FREQUENCIES DOWNSHIFTED PEAK HF RADIATION INSTABILITY FEATURES CUTLASS |
spellingShingle |
Science & Technology Physical Sciences Astronomy & Astrophysics Geosciences Multidisciplinary Meteorology & Atmospheric Sciences Geology Ionosphere active experiments particle acceleration plasma waves and instabilities ELECTROMAGNETIC EMISSION-SPECTRUM ION GYROHARMONIC STRUCTURES IONOSPHERIC PLASMA PUMP FREQUENCIES DOWNSHIFTED PEAK HF RADIATION INSTABILITY FEATURES CUTLASS Fu, H. Y. Scales, W. A. Bernhardt, P. A. Briczinski, S. J. Kosch, M. J. Senior, A. Rietveld, M. T. Yeoman, Timothy Kenneth Ruohoniemi, J. M. Stimulated Brillouin scattering during electron gyro-harmonic heating at EISCAT |
topic_facet |
Science & Technology Physical Sciences Astronomy & Astrophysics Geosciences Multidisciplinary Meteorology & Atmospheric Sciences Geology Ionosphere active experiments particle acceleration plasma waves and instabilities ELECTROMAGNETIC EMISSION-SPECTRUM ION GYROHARMONIC STRUCTURES IONOSPHERIC PLASMA PUMP FREQUENCIES DOWNSHIFTED PEAK HF RADIATION INSTABILITY FEATURES CUTLASS |
description |
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. Peer-reviewed Publisher Version |
format |
Article in Journal/Newspaper |
author |
Fu, H. Y. Scales, W. A. Bernhardt, P. A. Briczinski, S. J. Kosch, M. J. Senior, A. Rietveld, M. T. Yeoman, Timothy Kenneth Ruohoniemi, J. M. |
author_facet |
Fu, H. Y. Scales, W. A. Bernhardt, P. A. Briczinski, S. J. Kosch, M. J. Senior, A. Rietveld, M. T. Yeoman, Timothy Kenneth Ruohoniemi, J. M. |
author_sort |
Fu, H. Y. |
title |
Stimulated Brillouin scattering during electron gyro-harmonic heating at EISCAT |
title_short |
Stimulated Brillouin scattering during electron gyro-harmonic heating at EISCAT |
title_full |
Stimulated Brillouin scattering during electron gyro-harmonic heating at EISCAT |
title_fullStr |
Stimulated Brillouin scattering during electron gyro-harmonic heating at EISCAT |
title_full_unstemmed |
Stimulated Brillouin scattering during electron gyro-harmonic heating at EISCAT |
title_sort |
stimulated brillouin scattering during electron gyro-harmonic heating at eiscat |
publisher |
European Geosciences Union (EGU) |
publishDate |
2015 |
url |
http://www.ann-geophys.net/33/983/2015/angeo-33-983-2015.html http://hdl.handle.net/2381/35968 https://doi.org/10.5194/angeo-33-983-2015 |
genre |
EISCAT |
genre_facet |
EISCAT |
op_relation |
Annales Geophysicae, 2015, 33 (8), pp. 983-990 (8) 0992-7689 http://www.ann-geophys.net/33/983/2015/angeo-33-983-2015.html http://hdl.handle.net/2381/35968 doi:10.5194/angeo-33-983-2015 1432-0576 |
op_rights |
Copyright © Author(s) 2015. This work is distributed under the Creative Commons Attribution 3.0 License ( http://creativecommons.org/licenses/by/3.0/ ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/angeo-33-983-2015 |
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Annales Geophysicae |
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33 |
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8 |
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983 |
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990 |
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1766399858239864832 |