Modelling the effects of the October 1989 solar proton event on mesospheric odd nitrogen using a detailed ion and neutral chemistry model
International audience Solar proton events and electron precipitation affect the concentrations of middle atmospheric constituents. Ionization caused by precipitating particles enhances the production of important minor neutral constituents, such as nitric oxide, through reaction chains in which ion...
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ftinsu:oai:HAL:hal-00317445v1 2023-11-12T04:16:37+01:00 Modelling the effects of the October 1989 solar proton event on mesospheric odd nitrogen using a detailed ion and neutral chemistry model Verronen, P. T. Turunen, E. Ulich, Th. Kyrölä, E. Geophysical Research Division Helsinki Finnish Meteorological Institute (FMI) Sodankylä Geophysical Observatory University of Oulu 2002 https://hal.science/hal-00317445 https://hal.science/hal-00317445/document https://hal.science/hal-00317445/file/angeo-20-1967-2002.pdf en eng HAL CCSD European Geosciences Union hal-00317445 https://hal.science/hal-00317445 https://hal.science/hal-00317445/document https://hal.science/hal-00317445/file/angeo-20-1967-2002.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317445 Annales Geophysicae, 2002, 20 (12), pp.1967-1976 [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 2002 ftinsu 2023-10-25T16:25:15Z International audience Solar proton events and electron precipitation affect the concentrations of middle atmospheric constituents. Ionization caused by precipitating particles enhances the production of important minor neutral constituents, such as nitric oxide, through reaction chains in which ionic reactions play an important role. The Sodankylä Ion Chemistry model (SIC) has been modified and extended into a detailed ion and neutral chemistry model of the mesosphere. Our steady-state model (containing 55 ion species, 8 neutral species, and several hundred chemical reactions) is used to investigate the effect of the October 1989 solar proton event on odd nitrogen at altitudes between 50?90 km. The modelling results show that the NO concentration is significantly enhanced due to the proton precipitation, reaching 10 7 ?10 8 cm -3 throughout the mesosphere on the 20 October when the proton forcing was most severe. A comparison between the chemical production channels of odd nitrogen indicates that ion chemical reactions are an important factor in the total odd nitrogen production during intense ionization. The modelled electron concentration for the 23 October is compared with EISCAT incoherent scatter radar measurements and a reasonable agreement is found. Article in Journal/Newspaper EISCAT Sodankylä Institut national des sciences de l'Univers: HAL-INSU Sodankylä ENVELOPE(26.600,26.600,67.417,67.417) |
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Open Polar |
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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. Turunen, E. Ulich, Th. Kyrölä, E. Modelling the effects of the October 1989 solar proton event on mesospheric odd nitrogen using a detailed ion and neutral chemistry model |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Solar proton events and electron precipitation affect the concentrations of middle atmospheric constituents. Ionization caused by precipitating particles enhances the production of important minor neutral constituents, such as nitric oxide, through reaction chains in which ionic reactions play an important role. The Sodankylä Ion Chemistry model (SIC) has been modified and extended into a detailed ion and neutral chemistry model of the mesosphere. Our steady-state model (containing 55 ion species, 8 neutral species, and several hundred chemical reactions) is used to investigate the effect of the October 1989 solar proton event on odd nitrogen at altitudes between 50?90 km. The modelling results show that the NO concentration is significantly enhanced due to the proton precipitation, reaching 10 7 ?10 8 cm -3 throughout the mesosphere on the 20 October when the proton forcing was most severe. A comparison between the chemical production channels of odd nitrogen indicates that ion chemical reactions are an important factor in the total odd nitrogen production during intense ionization. The modelled electron concentration for the 23 October is compared with EISCAT incoherent scatter radar measurements and a reasonable agreement is found. |
author2 |
Geophysical Research Division Helsinki Finnish Meteorological Institute (FMI) Sodankylä Geophysical Observatory University of Oulu |
format |
Article in Journal/Newspaper |
author |
Verronen, P. T. Turunen, E. Ulich, Th. Kyrölä, E. |
author_facet |
Verronen, P. T. Turunen, E. Ulich, Th. Kyrölä, E. |
author_sort |
Verronen, P. T. |
title |
Modelling the effects of the October 1989 solar proton event on mesospheric odd nitrogen using a detailed ion and neutral chemistry model |
title_short |
Modelling the effects of the October 1989 solar proton event on mesospheric odd nitrogen using a detailed ion and neutral chemistry model |
title_full |
Modelling the effects of the October 1989 solar proton event on mesospheric odd nitrogen using a detailed ion and neutral chemistry model |
title_fullStr |
Modelling the effects of the October 1989 solar proton event on mesospheric odd nitrogen using a detailed ion and neutral chemistry model |
title_full_unstemmed |
Modelling the effects of the October 1989 solar proton event on mesospheric odd nitrogen using a detailed ion and neutral chemistry model |
title_sort |
modelling the effects of the october 1989 solar proton event on mesospheric odd nitrogen using a detailed ion and neutral chemistry model |
publisher |
HAL CCSD |
publishDate |
2002 |
url |
https://hal.science/hal-00317445 https://hal.science/hal-00317445/document https://hal.science/hal-00317445/file/angeo-20-1967-2002.pdf |
long_lat |
ENVELOPE(26.600,26.600,67.417,67.417) |
geographic |
Sodankylä |
geographic_facet |
Sodankylä |
genre |
EISCAT Sodankylä |
genre_facet |
EISCAT Sodankylä |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317445 Annales Geophysicae, 2002, 20 (12), pp.1967-1976 |
op_relation |
hal-00317445 https://hal.science/hal-00317445 https://hal.science/hal-00317445/document https://hal.science/hal-00317445/file/angeo-20-1967-2002.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782333696624295936 |