Current state-of-the-art for the measurement of non-Maxwellian plasma parameters with the EISCAT UHF Facility
New results on the information that can be extracted from simulated non-Maxwellian incoherent radar spectra are presented. The cases of a pure ionosphere and of a composite ionosphere typical of a given altitude of the auroral F region are considered. In the case of a pure ionosphere of NO + or O +...
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ftdoajarticles:oai:doaj.org/article:5f1603230e074747accaf489a2151803 2023-05-15T16:04:49+02:00 Current state-of-the-art for the measurement of non-Maxwellian plasma parameters with the EISCAT UHF Facility D. Hubert F. Leblanc P. Gaimard 1996-12-01T00:00:00Z https://doi.org/10.1007/s00585-996-1506-4 https://doaj.org/article/5f1603230e074747accaf489a2151803 EN eng Copernicus Publications https://www.ann-geophys.net/14/1506/1996/angeo-14-1506-1996.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-996-1506-4 0992-7689 1432-0576 https://doaj.org/article/5f1603230e074747accaf489a2151803 Annales Geophysicae, Vol 14, Pp 1506-1512 (1996) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 1996 ftdoajarticles https://doi.org/10.1007/s00585-996-1506-4 2022-12-30T20:51:59Z New results on the information that can be extracted from simulated non-Maxwellian incoherent radar spectra are presented. The cases of a pure ionosphere and of a composite ionosphere typical of a given altitude of the auroral F region are considered. In the case of a pure ionosphere of NO + or O + ions it has been shown that the electron temperature and the electron density can be derived from a Maxwellian analysis of radar spectra measured at aspect angles of 0° or 21° respectively; the ion temperature and ion temperature anisotropy can be derived from a non- constraining model such as the 1D Raman fitting of a complementary measurement made at an aspect angle larger than 0° for the NO + ions, or at an aspect angle larger than 21° for the O + ions. Moreover with such measurements at large aspect angles, the shape of the velocity ion distribution functions can simultaneously be inferred. The case of a composite ionosphere of atomic O + and molecular NO + ions is a difficult challenge which requires simultaneously a complementary measurement of the electron temperature to provide the ion composition and the electron density from the incoherent radar spectra at a specific aspect angle of 21°; hence, a model dependent routine is necessary to derive the ion temperatures and ion temperature anisotropies. In the case where the electron temperature is not given, a routine which depends on ion distribution models is required first: the better the ion distribution models are, the more accurately derived the plasma parameters will be. In both cases of a composite ionosphere, the 1D Raman fitting can be used to keep a check on the validity of the results provided by the ion distribution model dependent routine. Article in Journal/Newspaper EISCAT Directory of Open Access Journals: DOAJ Articles Annales Geophysicae 14 12 1506 1512 |
institution |
Open Polar |
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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 D. Hubert F. Leblanc P. Gaimard Current state-of-the-art for the measurement of non-Maxwellian plasma parameters with the EISCAT UHF Facility |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
New results on the information that can be extracted from simulated non-Maxwellian incoherent radar spectra are presented. The cases of a pure ionosphere and of a composite ionosphere typical of a given altitude of the auroral F region are considered. In the case of a pure ionosphere of NO + or O + ions it has been shown that the electron temperature and the electron density can be derived from a Maxwellian analysis of radar spectra measured at aspect angles of 0° or 21° respectively; the ion temperature and ion temperature anisotropy can be derived from a non- constraining model such as the 1D Raman fitting of a complementary measurement made at an aspect angle larger than 0° for the NO + ions, or at an aspect angle larger than 21° for the O + ions. Moreover with such measurements at large aspect angles, the shape of the velocity ion distribution functions can simultaneously be inferred. The case of a composite ionosphere of atomic O + and molecular NO + ions is a difficult challenge which requires simultaneously a complementary measurement of the electron temperature to provide the ion composition and the electron density from the incoherent radar spectra at a specific aspect angle of 21°; hence, a model dependent routine is necessary to derive the ion temperatures and ion temperature anisotropies. In the case where the electron temperature is not given, a routine which depends on ion distribution models is required first: the better the ion distribution models are, the more accurately derived the plasma parameters will be. In both cases of a composite ionosphere, the 1D Raman fitting can be used to keep a check on the validity of the results provided by the ion distribution model dependent routine. |
format |
Article in Journal/Newspaper |
author |
D. Hubert F. Leblanc P. Gaimard |
author_facet |
D. Hubert F. Leblanc P. Gaimard |
author_sort |
D. Hubert |
title |
Current state-of-the-art for the measurement of non-Maxwellian plasma parameters with the EISCAT UHF Facility |
title_short |
Current state-of-the-art for the measurement of non-Maxwellian plasma parameters with the EISCAT UHF Facility |
title_full |
Current state-of-the-art for the measurement of non-Maxwellian plasma parameters with the EISCAT UHF Facility |
title_fullStr |
Current state-of-the-art for the measurement of non-Maxwellian plasma parameters with the EISCAT UHF Facility |
title_full_unstemmed |
Current state-of-the-art for the measurement of non-Maxwellian plasma parameters with the EISCAT UHF Facility |
title_sort |
current state-of-the-art for the measurement of non-maxwellian plasma parameters with the eiscat uhf facility |
publisher |
Copernicus Publications |
publishDate |
1996 |
url |
https://doi.org/10.1007/s00585-996-1506-4 https://doaj.org/article/5f1603230e074747accaf489a2151803 |
genre |
EISCAT |
genre_facet |
EISCAT |
op_source |
Annales Geophysicae, Vol 14, Pp 1506-1512 (1996) |
op_relation |
https://www.ann-geophys.net/14/1506/1996/angeo-14-1506-1996.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-996-1506-4 0992-7689 1432-0576 https://doaj.org/article/5f1603230e074747accaf489a2151803 |
op_doi |
https://doi.org/10.1007/s00585-996-1506-4 |
container_title |
Annales Geophysicae |
container_volume |
14 |
container_issue |
12 |
container_start_page |
1506 |
op_container_end_page |
1512 |
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1766400452428038144 |