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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ftdoajarticles:oai:doaj.org/article:cc2fc75f0aef4bf4a3eb4c868452d871 2023-05-15T16:04:42+02:00 Ion-acoustic solitary waves and spectrally uniform scattering cross section enhancements J. Ekeberg G. Wannberg L. Eliasson K. Stasiewicz 2010-06-01T00:00:00Z https://doi.org/10.5194/angeo-28-1299-2010 https://doaj.org/article/cc2fc75f0aef4bf4a3eb4c868452d871 EN eng Copernicus Publications https://www.ann-geophys.net/28/1299/2010/angeo-28-1299-2010.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-28-1299-2010 0992-7689 1432-0576 https://doaj.org/article/cc2fc75f0aef4bf4a3eb4c868452d871 Annales Geophysicae, Vol 28, Pp 1299-1306 (2010) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2010 ftdoajarticles https://doi.org/10.5194/angeo-28-1299-2010 2022-12-31T14:27:16Z 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. Article in Journal/Newspaper EISCAT Svalbard Directory of Open Access Journals: DOAJ Articles Langmuir ENVELOPE(-67.150,-67.150,-66.967,-66.967) Svalbard Annales Geophysicae 28 6 1299 1306 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 J. Ekeberg G. Wannberg L. Eliasson K. Stasiewicz Ion-acoustic solitary waves and spectrally uniform scattering cross section enhancements |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
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 |
Article in Journal/Newspaper |
author |
J. Ekeberg G. Wannberg L. Eliasson K. Stasiewicz |
author_facet |
J. Ekeberg G. Wannberg L. Eliasson K. Stasiewicz |
author_sort |
J. Ekeberg |
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 |
publisher |
Copernicus Publications |
publishDate |
2010 |
url |
https://doi.org/10.5194/angeo-28-1299-2010 https://doaj.org/article/cc2fc75f0aef4bf4a3eb4c868452d871 |
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 |
Annales Geophysicae, Vol 28, Pp 1299-1306 (2010) |
op_relation |
https://www.ann-geophys.net/28/1299/2010/angeo-28-1299-2010.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-28-1299-2010 0992-7689 1432-0576 https://doaj.org/article/cc2fc75f0aef4bf4a3eb4c868452d871 |
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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1766400320937656320 |