Sunset transition of negative charge in the D-region ionosphere during high-ionization conditions
International audience The solar proton event of October 1989 and especially the sunset of 23 October is examined in this study of negative ion chemistry, which combines measurements of nitric oxide, electron density, and cosmic radio noise absorption with ion and neutral chemistry modelling. Model...
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ftinsu:oai:HAL:hal-00317927v1 2023-11-12T04:16:37+01:00 Sunset transition of negative charge in the D-region ionosphere during high-ionization conditions Verronen, P. T. Ulich, Th. Turunen, E. Rodger, C. J. Finnish Meteorological Institute (FMI) Sodankylä Geophysical Observatory University of Oulu Physics Department University of Otago Dunedin, Nouvelle-Zélande 2006-03-07 https://hal.science/hal-00317927 https://hal.science/hal-00317927/document https://hal.science/hal-00317927/file/angeo-24-187-2006.pdf en eng HAL CCSD European Geosciences Union hal-00317927 https://hal.science/hal-00317927 https://hal.science/hal-00317927/document https://hal.science/hal-00317927/file/angeo-24-187-2006.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317927 Annales Geophysicae, 2006, 24 (1), pp.187-202 [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 2006 ftinsu 2023-10-25T16:25:08Z International audience The solar proton event of October 1989 and especially the sunset of 23 October is examined in this study of negative ion chemistry, which combines measurements of nitric oxide, electron density, and cosmic radio noise absorption with ion and neutral chemistry modelling. Model results show that the negative charge transition from electrons to negative ions during sunset occurs at altitudes below 80 km and is dependent on both ultraviolet and visible solar radiation. The ultraviolet effect is mostly due to rapid changes in atomic oxygen and O 2 ( 1 ? g ), while the decrease in NO 3 - photodetachment plays a minor role. The effect driven by visible wavelengths is due to changes in photodissociation of CO 3 - and the subsequent electron photodetachment from O - , and at higher altitudes is also due to a decrease in the photodetachment of O 2 - . The relative sizes of the ultraviolet and visible effects vary with altitude, with the visible effects increasing in importance at higher altitudes, and they are also controlled by the nitric oxide concentration. These modelling results are in good agreement with EISCAT incoherent scatter radar and Kilpisjärvi riometer measurements. Article in Journal/Newspaper EISCAT Kilpisjärvi Institut national des sciences de l'Univers: HAL-INSU Kilpisjärvi ENVELOPE(20.767,20.767,69.034,69.034) |
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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 |
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[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Verronen, P. T. Ulich, Th. Turunen, E. Rodger, C. J. Sunset transition of negative charge in the D-region ionosphere during high-ionization conditions |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The solar proton event of October 1989 and especially the sunset of 23 October is examined in this study of negative ion chemistry, which combines measurements of nitric oxide, electron density, and cosmic radio noise absorption with ion and neutral chemistry modelling. Model results show that the negative charge transition from electrons to negative ions during sunset occurs at altitudes below 80 km and is dependent on both ultraviolet and visible solar radiation. The ultraviolet effect is mostly due to rapid changes in atomic oxygen and O 2 ( 1 ? g ), while the decrease in NO 3 - photodetachment plays a minor role. The effect driven by visible wavelengths is due to changes in photodissociation of CO 3 - and the subsequent electron photodetachment from O - , and at higher altitudes is also due to a decrease in the photodetachment of O 2 - . The relative sizes of the ultraviolet and visible effects vary with altitude, with the visible effects increasing in importance at higher altitudes, and they are also controlled by the nitric oxide concentration. These modelling results are in good agreement with EISCAT incoherent scatter radar and Kilpisjärvi riometer measurements. |
author2 |
Finnish Meteorological Institute (FMI) Sodankylä Geophysical Observatory University of Oulu Physics Department University of Otago Dunedin, Nouvelle-Zélande |
format |
Article in Journal/Newspaper |
author |
Verronen, P. T. Ulich, Th. Turunen, E. Rodger, C. J. |
author_facet |
Verronen, P. T. Ulich, Th. Turunen, E. Rodger, C. J. |
author_sort |
Verronen, P. T. |
title |
Sunset transition of negative charge in the D-region ionosphere during high-ionization conditions |
title_short |
Sunset transition of negative charge in the D-region ionosphere during high-ionization conditions |
title_full |
Sunset transition of negative charge in the D-region ionosphere during high-ionization conditions |
title_fullStr |
Sunset transition of negative charge in the D-region ionosphere during high-ionization conditions |
title_full_unstemmed |
Sunset transition of negative charge in the D-region ionosphere during high-ionization conditions |
title_sort |
sunset transition of negative charge in the d-region ionosphere during high-ionization conditions |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.science/hal-00317927 https://hal.science/hal-00317927/document https://hal.science/hal-00317927/file/angeo-24-187-2006.pdf |
long_lat |
ENVELOPE(20.767,20.767,69.034,69.034) |
geographic |
Kilpisjärvi |
geographic_facet |
Kilpisjärvi |
genre |
EISCAT Kilpisjärvi |
genre_facet |
EISCAT Kilpisjärvi |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317927 Annales Geophysicae, 2006, 24 (1), pp.187-202 |
op_relation |
hal-00317927 https://hal.science/hal-00317927 https://hal.science/hal-00317927/document https://hal.science/hal-00317927/file/angeo-24-187-2006.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782333699853910016 |