Polar mesosphere summer echoes during the July 2000 solar protonevent
International audience The influence of the solar proton event (SPE) 14?16 July 2000 on Polar Mesosphere Summer Echoes (PMSE) is examined. PMSE were observed by the Esrange VHF MST Radar (ESRAD) at 67°53'N, 21°06'E. The 30MHz Imaging Riometer for Ionospheric Studies IRIS in Kilpisjärvi (69...
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ftccsdartic:oai:HAL:hal-00317257v1 2023-12-31T10:08:54+01:00 Polar mesosphere summer echoes during the July 2000 solar protonevent Barabash, V. Kirkwood, S. Feofilov, A. Kutepov, A. Swedish Institute of Space Physics Kiruna (IRF) Institute for Astronomy and Astrophysics Munich Ludwig Maximilian University Munich = Ludwig Maximilians Universität München (LMU) 2004-03-19 https://hal.science/hal-00317257 https://hal.science/hal-00317257/document https://hal.science/hal-00317257/file/angeo-22-759-2004.pdf en eng HAL CCSD European Geosciences Union hal-00317257 https://hal.science/hal-00317257 https://hal.science/hal-00317257/document https://hal.science/hal-00317257/file/angeo-22-759-2004.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317257 Annales Geophysicae, 2004, 22 (3), pp.759-771 [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 2004 ftccsdartic 2023-12-02T23:59:45Z International audience The influence of the solar proton event (SPE) 14?16 July 2000 on Polar Mesosphere Summer Echoes (PMSE) is examined. PMSE were observed by the Esrange VHF MST Radar (ESRAD) at 67°53'N, 21°06'E. The 30MHz Imaging Riometer for Ionospheric Studies IRIS in Kilpisjärvi (69°30'N, 20°47'E) registered cosmic radio noise absorption caused by ionisation changes in response to the energetic particle precipitation. An energy deposition/ion-chemical model was used to estimate the density of free electrons and ions in the upper atmosphere. Particle collision frequencies were calculated from the MSISE-90 model. Electric fields were calculated using conductivities from the model and measured magnetic disturbances. The electric field reached a maximum of 91mV/m during the most intensive period of the geomagnetic storm accompanying the SPE. The temperature increase due to Joule and particle heating was calculated, taking into account radiative cooling. The temperature increase at PMSE heights was found to be very small. The observed PMSE were rather intensive and extended over the 80?90km height interval. PMSE almost disappeared above 86km at the time of greatest Joule heating on 15 July 2000. Neither ionisation changes, nor Joule/particle heating can explain the PMSE reduction. Transport effects due to the strong electric field are a more likely explanation. Key words. Meteorology and atmospheric dynamics (middle atmospheric dynamics), ionosphere (ionospheric disturbances; solar radiation and cosmic ray effects) Article in Journal/Newspaper Kilpisjärvi Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
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 Barabash, V. Kirkwood, S. Feofilov, A. Kutepov, A. Polar mesosphere summer echoes during the July 2000 solar protonevent |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The influence of the solar proton event (SPE) 14?16 July 2000 on Polar Mesosphere Summer Echoes (PMSE) is examined. PMSE were observed by the Esrange VHF MST Radar (ESRAD) at 67°53'N, 21°06'E. The 30MHz Imaging Riometer for Ionospheric Studies IRIS in Kilpisjärvi (69°30'N, 20°47'E) registered cosmic radio noise absorption caused by ionisation changes in response to the energetic particle precipitation. An energy deposition/ion-chemical model was used to estimate the density of free electrons and ions in the upper atmosphere. Particle collision frequencies were calculated from the MSISE-90 model. Electric fields were calculated using conductivities from the model and measured magnetic disturbances. The electric field reached a maximum of 91mV/m during the most intensive period of the geomagnetic storm accompanying the SPE. The temperature increase due to Joule and particle heating was calculated, taking into account radiative cooling. The temperature increase at PMSE heights was found to be very small. The observed PMSE were rather intensive and extended over the 80?90km height interval. PMSE almost disappeared above 86km at the time of greatest Joule heating on 15 July 2000. Neither ionisation changes, nor Joule/particle heating can explain the PMSE reduction. Transport effects due to the strong electric field are a more likely explanation. Key words. Meteorology and atmospheric dynamics (middle atmospheric dynamics), ionosphere (ionospheric disturbances; solar radiation and cosmic ray effects) |
author2 |
Swedish Institute of Space Physics Kiruna (IRF) Institute for Astronomy and Astrophysics Munich Ludwig Maximilian University Munich = Ludwig Maximilians Universität München (LMU) |
format |
Article in Journal/Newspaper |
author |
Barabash, V. Kirkwood, S. Feofilov, A. Kutepov, A. |
author_facet |
Barabash, V. Kirkwood, S. Feofilov, A. Kutepov, A. |
author_sort |
Barabash, V. |
title |
Polar mesosphere summer echoes during the July 2000 solar protonevent |
title_short |
Polar mesosphere summer echoes during the July 2000 solar protonevent |
title_full |
Polar mesosphere summer echoes during the July 2000 solar protonevent |
title_fullStr |
Polar mesosphere summer echoes during the July 2000 solar protonevent |
title_full_unstemmed |
Polar mesosphere summer echoes during the July 2000 solar protonevent |
title_sort |
polar mesosphere summer echoes during the july 2000 solar protonevent |
publisher |
HAL CCSD |
publishDate |
2004 |
url |
https://hal.science/hal-00317257 https://hal.science/hal-00317257/document https://hal.science/hal-00317257/file/angeo-22-759-2004.pdf |
genre |
Kilpisjärvi |
genre_facet |
Kilpisjärvi |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317257 Annales Geophysicae, 2004, 22 (3), pp.759-771 |
op_relation |
hal-00317257 https://hal.science/hal-00317257 https://hal.science/hal-00317257/document https://hal.science/hal-00317257/file/angeo-22-759-2004.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1786841849380470784 |