Current state-of-the-art for the measurement of non-Maxwellian plasma parameters with the EISCAT UHF Facility
International audience 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 ion...
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ftinsu:oai:HAL:hal-00329064v1 2023-11-12T04:16:38+01:00 Current state-of-the-art for the measurement of non-Maxwellian plasma parameters with the EISCAT UHF Facility Hubert, D. Leblanc, François Gaimard, P. Departement de Recherche Spatiale Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL) Observatoire de Paris - Site de Meudon (OBSPM) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) Centre d'Études des Phénomènes Aléatoires et Géophysiques (CEPHAG) École Nationale Supérieure d'Ingénieurs Électriciens de Grenoble (ENSIEG)-Centre National de la Recherche Scientifique (CNRS) 1996 https://hal.science/hal-00329064 https://hal.science/hal-00329064/document https://hal.science/hal-00329064/file/angeo-14-1506-1996.pdf en eng HAL CCSD European Geosciences Union hal-00329064 https://hal.science/hal-00329064 https://hal.science/hal-00329064/document https://hal.science/hal-00329064/file/angeo-14-1506-1996.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00329064 Annales Geophysicae, 1996, 14 (12), pp.1506-1512 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 1996 ftinsu 2023-10-25T16:24:35Z International audience 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 Institut national des sciences de l'Univers: HAL-INSU |
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Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Hubert, D. Leblanc, François Gaimard, P. Current state-of-the-art for the measurement of non-Maxwellian plasma parameters with the EISCAT UHF Facility |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience 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. |
author2 |
Departement de Recherche Spatiale Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL) Observatoire de Paris - Site de Meudon (OBSPM) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) Centre d'Études des Phénomènes Aléatoires et Géophysiques (CEPHAG) École Nationale Supérieure d'Ingénieurs Électriciens de Grenoble (ENSIEG)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Hubert, D. Leblanc, François Gaimard, P. |
author_facet |
Hubert, D. Leblanc, François Gaimard, P. |
author_sort |
Hubert, D. |
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 |
HAL CCSD |
publishDate |
1996 |
url |
https://hal.science/hal-00329064 https://hal.science/hal-00329064/document https://hal.science/hal-00329064/file/angeo-14-1506-1996.pdf |
genre |
EISCAT |
genre_facet |
EISCAT |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00329064 Annales Geophysicae, 1996, 14 (12), pp.1506-1512 |
op_relation |
hal-00329064 https://hal.science/hal-00329064 https://hal.science/hal-00329064/document https://hal.science/hal-00329064/file/angeo-14-1506-1996.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782333716372127744 |