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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ftcopernicus:oai:publications.copernicus.org:angeo33830 2023-05-15T16:04:29+02:00 A numerical model of the ionosphere, including the E-region above EISCAT Diloy, P.-Y. Robineau, A. Lilensten, J. Blelly, P.-L. Fontanari, J. 2018-09-27 application/pdf https://doi.org/10.1007/s00585-996-0191-7 https://angeo.copernicus.org/articles/14/191/1996/ eng eng doi:10.1007/s00585-996-0191-7 https://angeo.copernicus.org/articles/14/191/1996/ eISSN: 1432-0576 Text 2018 ftcopernicus https://doi.org/10.1007/s00585-996-0191-7 2020-07-20T16:28:12Z 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. Text EISCAT Copernicus Publications: E-Journals Annales Geophysicae 14 2 191 200 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
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 |
Text |
author |
Diloy, P.-Y. Robineau, A. Lilensten, J. Blelly, P.-L. Fontanari, J. |
spellingShingle |
Diloy, P.-Y. Robineau, A. Lilensten, J. Blelly, P.-L. Fontanari, J. A numerical model of the ionosphere, including the E-region above EISCAT |
author_facet |
Diloy, P.-Y. Robineau, A. Lilensten, J. Blelly, P.-L. Fontanari, J. |
author_sort |
Diloy, P.-Y. |
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 |
publishDate |
2018 |
url |
https://doi.org/10.1007/s00585-996-0191-7 https://angeo.copernicus.org/articles/14/191/1996/ |
genre |
EISCAT |
genre_facet |
EISCAT |
op_source |
eISSN: 1432-0576 |
op_relation |
doi:10.1007/s00585-996-0191-7 https://angeo.copernicus.org/articles/14/191/1996/ |
op_doi |
https://doi.org/10.1007/s00585-996-0191-7 |
container_title |
Annales Geophysicae |
container_volume |
14 |
container_issue |
2 |
container_start_page |
191 |
op_container_end_page |
200 |
_version_ |
1766400068501372928 |