Ion-acoustic solitary waves and spectrally uniform scattering cross section enhancements
Spectra measured by incoherent scatter radars are formed predominantly by scattering of the incident signal off ion-acoustic and Langmuir waves in the ionosphere. Occasionally, the upshifted and/or downshifted lines produced by the ion-acoustic waves are enhanced well above thermal levels and referr...
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ftcopernicus:oai:publications.copernicus.org:angeo36951 2023-05-15T16:04:41+02:00 Ion-acoustic solitary waves and spectrally uniform scattering cross section enhancements Ekeberg, J. Wannberg, G. Eliasson, L. Stasiewicz, K. 2018-09-27 application/pdf https://doi.org/10.5194/angeo-28-1299-2010 https://angeo.copernicus.org/articles/28/1299/2010/ eng eng doi:10.5194/angeo-28-1299-2010 https://angeo.copernicus.org/articles/28/1299/2010/ eISSN: 1432-0576 Text 2018 ftcopernicus https://doi.org/10.5194/angeo-28-1299-2010 2020-07-20T16:26:24Z Spectra measured by incoherent scatter radars are formed predominantly by scattering of the incident signal off ion-acoustic and Langmuir waves in the ionosphere. Occasionally, the upshifted and/or downshifted lines produced by the ion-acoustic waves are enhanced well above thermal levels and referred to as naturally enhanced ion-acoustic lines. In this paper, we study another kind of enhancement, which is spectrally uniform over the whole ion-line, i.e. the up- and downshifted shoulder and the spectral valley in between. Based on observations made with the EISCAT Svalbard radar (ESR) facility, we investigate the transient and spectrally uniform power enhancements, which can be explained by ion-acoustic solitary waves. We use a theory of nonlinear waves in a magnetized plasma to determine the properties of such waves and evaluate their effects on scattered signals measured by ESR. We suggest a new mechanism that can explain backscattered power enhancements by one order of magnitude above the thermal level and show that it is consistent with observations. Text EISCAT Svalbard Copernicus Publications: E-Journals Langmuir ENVELOPE(-67.150,-67.150,-66.967,-66.967) Svalbard Annales Geophysicae 28 6 1299 1306 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Spectra measured by incoherent scatter radars are formed predominantly by scattering of the incident signal off ion-acoustic and Langmuir waves in the ionosphere. Occasionally, the upshifted and/or downshifted lines produced by the ion-acoustic waves are enhanced well above thermal levels and referred to as naturally enhanced ion-acoustic lines. In this paper, we study another kind of enhancement, which is spectrally uniform over the whole ion-line, i.e. the up- and downshifted shoulder and the spectral valley in between. Based on observations made with the EISCAT Svalbard radar (ESR) facility, we investigate the transient and spectrally uniform power enhancements, which can be explained by ion-acoustic solitary waves. We use a theory of nonlinear waves in a magnetized plasma to determine the properties of such waves and evaluate their effects on scattered signals measured by ESR. We suggest a new mechanism that can explain backscattered power enhancements by one order of magnitude above the thermal level and show that it is consistent with observations. |
format |
Text |
author |
Ekeberg, J. Wannberg, G. Eliasson, L. Stasiewicz, K. |
spellingShingle |
Ekeberg, J. Wannberg, G. Eliasson, L. Stasiewicz, K. Ion-acoustic solitary waves and spectrally uniform scattering cross section enhancements |
author_facet |
Ekeberg, J. Wannberg, G. Eliasson, L. Stasiewicz, K. |
author_sort |
Ekeberg, J. |
title |
Ion-acoustic solitary waves and spectrally uniform scattering cross section enhancements |
title_short |
Ion-acoustic solitary waves and spectrally uniform scattering cross section enhancements |
title_full |
Ion-acoustic solitary waves and spectrally uniform scattering cross section enhancements |
title_fullStr |
Ion-acoustic solitary waves and spectrally uniform scattering cross section enhancements |
title_full_unstemmed |
Ion-acoustic solitary waves and spectrally uniform scattering cross section enhancements |
title_sort |
ion-acoustic solitary waves and spectrally uniform scattering cross section enhancements |
publishDate |
2018 |
url |
https://doi.org/10.5194/angeo-28-1299-2010 https://angeo.copernicus.org/articles/28/1299/2010/ |
long_lat |
ENVELOPE(-67.150,-67.150,-66.967,-66.967) |
geographic |
Langmuir Svalbard |
geographic_facet |
Langmuir Svalbard |
genre |
EISCAT Svalbard |
genre_facet |
EISCAT Svalbard |
op_source |
eISSN: 1432-0576 |
op_relation |
doi:10.5194/angeo-28-1299-2010 https://angeo.copernicus.org/articles/28/1299/2010/ |
op_doi |
https://doi.org/10.5194/angeo-28-1299-2010 |
container_title |
Annales Geophysicae |
container_volume |
28 |
container_issue |
6 |
container_start_page |
1299 |
op_container_end_page |
1306 |
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1766400297723232256 |