A numerical model of the ionosphere, including the E-region above EISCAT
It has been previously demonstrated that a two-ion (O + and H + ) 8-moment time-dependent fluid model was able to reproduce correctly the ionospheric structure in the altitude range probed by the EISCAT-VHF radar. In the present study, the model is extended down to the E-region where molecular ion c...
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ftdoajarticles:oai:doaj.org/article:31517a9351724a90a6704ae611128508 2023-05-15T16:04:30+02:00 A numerical model of the ionosphere, including the E-region above EISCAT P.-Y. Diloy A. Robineau J. Lilensten P.-L. Blelly J. Fontanari https://doaj.org/article/31517a9351724a90a6704ae611128508 EN eng Copernicus Publications http://www.ann-geophys.net/14/191/1996/angeo-14-191-1996.html https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 0992-7689 1432-0576 https://doaj.org/article/31517a9351724a90a6704ae611128508 Annales Geophysicae, Vol 14, Iss 2, Pp 191-200 (0000) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article ftdoajarticles 2022-12-31T02:52:04Z It has been previously demonstrated that a two-ion (O + and H + ) 8-moment time-dependent fluid model was able to reproduce correctly the ionospheric structure in the altitude range probed by the EISCAT-VHF radar. In the present study, the model is extended down to the E-region where molecular ion chemistry (NO + and O + 2 , essentially) prevails over transport; EISCAT-UHF observations confirmed previous theoretical predictions that during events of intense E × B induced convection drifts, molecular ions (mainly NO + ) predominate over O + ions up to altitudes of 300 km. In addition to this extension of the model down to the E-region, the ionization and heating resulting from both solar insolation and particle precipitation is now taken into account in a consistent manner through a complete kinetic transport code. The effects of E × B induced convection drifts on the E- and F-region are presented: the balance between O + and NO + ions is drastically affected; the electric field acts to deplete the O + ion concentration. The [NO + ]/[O + ] transition altitude varies from 190 km to 320 km as the perpendicular electric field increases from 0 to 100 mV m -1 . An interesting additional by-product of the model is that it also predicts the presence of a noticeable fraction of N + ions in the topside ionosphere in good agreement with Retarding Ion Mass Spectrometer measurements onboard Dynamic Explorer. Article in Journal/Newspaper EISCAT Directory of Open Access Journals: DOAJ Articles |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
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Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 P.-Y. Diloy A. Robineau J. Lilensten P.-L. Blelly J. Fontanari A numerical model of the ionosphere, including the E-region above EISCAT |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
It has been previously demonstrated that a two-ion (O + and H + ) 8-moment time-dependent fluid model was able to reproduce correctly the ionospheric structure in the altitude range probed by the EISCAT-VHF radar. In the present study, the model is extended down to the E-region where molecular ion chemistry (NO + and O + 2 , essentially) prevails over transport; EISCAT-UHF observations confirmed previous theoretical predictions that during events of intense E × B induced convection drifts, molecular ions (mainly NO + ) predominate over O + ions up to altitudes of 300 km. In addition to this extension of the model down to the E-region, the ionization and heating resulting from both solar insolation and particle precipitation is now taken into account in a consistent manner through a complete kinetic transport code. The effects of E × B induced convection drifts on the E- and F-region are presented: the balance between O + and NO + ions is drastically affected; the electric field acts to deplete the O + ion concentration. The [NO + ]/[O + ] transition altitude varies from 190 km to 320 km as the perpendicular electric field increases from 0 to 100 mV m -1 . An interesting additional by-product of the model is that it also predicts the presence of a noticeable fraction of N + ions in the topside ionosphere in good agreement with Retarding Ion Mass Spectrometer measurements onboard Dynamic Explorer. |
format |
Article in Journal/Newspaper |
author |
P.-Y. Diloy A. Robineau J. Lilensten P.-L. Blelly J. Fontanari |
author_facet |
P.-Y. Diloy A. Robineau J. Lilensten P.-L. Blelly J. Fontanari |
author_sort |
P.-Y. Diloy |
title |
A numerical model of the ionosphere, including the E-region above EISCAT |
title_short |
A numerical model of the ionosphere, including the E-region above EISCAT |
title_full |
A numerical model of the ionosphere, including the E-region above EISCAT |
title_fullStr |
A numerical model of the ionosphere, including the E-region above EISCAT |
title_full_unstemmed |
A numerical model of the ionosphere, including the E-region above EISCAT |
title_sort |
numerical model of the ionosphere, including the e-region above eiscat |
publisher |
Copernicus Publications |
url |
https://doaj.org/article/31517a9351724a90a6704ae611128508 |
genre |
EISCAT |
genre_facet |
EISCAT |
op_source |
Annales Geophysicae, Vol 14, Iss 2, Pp 191-200 (0000) |
op_relation |
http://www.ann-geophys.net/14/191/1996/angeo-14-191-1996.html https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 0992-7689 1432-0576 https://doaj.org/article/31517a9351724a90a6704ae611128508 |
_version_ |
1766400084617986048 |