Seasonal variations in the incidence of auroral radio absorption events at very high latitude, and the influence of the magnetotail
International audience A statistical analysis has been made of the incidence of auroral radio absorption events at South Pole, and of its dependence on basic geophysical parameters such as season, time of day, and magnetic activity level. It is found that at low and moderate levels of activity the i...
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ftccsdartic:oai:HAL:hal-00318295v1 2023-05-15T18:22:28+02:00 Seasonal variations in the incidence of auroral radio absorption events at very high latitude, and the influence of the magnetotail Hargreaves, J. K. Dept. of Communication Systems Lancaster University 2007-03-29 https://hal.archives-ouvertes.fr/hal-00318295 https://hal.archives-ouvertes.fr/hal-00318295/document https://hal.archives-ouvertes.fr/hal-00318295/file/angeo-25-711-2007.pdf en eng HAL CCSD European Geosciences Union hal-00318295 https://hal.archives-ouvertes.fr/hal-00318295 https://hal.archives-ouvertes.fr/hal-00318295/document https://hal.archives-ouvertes.fr/hal-00318295/file/angeo-25-711-2007.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.archives-ouvertes.fr/hal-00318295 Annales Geophysicae, European Geosciences Union, 2007, 25 (3), pp.711-720 [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 2007 ftccsdartic 2021-05-30T00:31:19Z International audience A statistical analysis has been made of the incidence of auroral radio absorption events at South Pole, and of its dependence on basic geophysical parameters such as season, time of day, and magnetic activity level. It is found that at low and moderate levels of activity the incidence of events in the winter season is at least twice that in the summer. However, at high activity no events at all occurred during the local summer night, which appears to be explicable as the effect of the magnetotail and the consequent distortion of the magnetosphere when the southern polar region is tilted strongly towards the Sun. Previous results from even higher latitudes show the effect in an even more exaggerated form, in that both the day and night periods of absorption activity exhibit strong seasonal variations. Article in Journal/Newspaper South pole Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) South Pole |
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Open Polar |
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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 Hargreaves, J. K. Seasonal variations in the incidence of auroral radio absorption events at very high latitude, and the influence of the magnetotail |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience A statistical analysis has been made of the incidence of auroral radio absorption events at South Pole, and of its dependence on basic geophysical parameters such as season, time of day, and magnetic activity level. It is found that at low and moderate levels of activity the incidence of events in the winter season is at least twice that in the summer. However, at high activity no events at all occurred during the local summer night, which appears to be explicable as the effect of the magnetotail and the consequent distortion of the magnetosphere when the southern polar region is tilted strongly towards the Sun. Previous results from even higher latitudes show the effect in an even more exaggerated form, in that both the day and night periods of absorption activity exhibit strong seasonal variations. |
author2 |
Dept. of Communication Systems Lancaster University |
format |
Article in Journal/Newspaper |
author |
Hargreaves, J. K. |
author_facet |
Hargreaves, J. K. |
author_sort |
Hargreaves, J. K. |
title |
Seasonal variations in the incidence of auroral radio absorption events at very high latitude, and the influence of the magnetotail |
title_short |
Seasonal variations in the incidence of auroral radio absorption events at very high latitude, and the influence of the magnetotail |
title_full |
Seasonal variations in the incidence of auroral radio absorption events at very high latitude, and the influence of the magnetotail |
title_fullStr |
Seasonal variations in the incidence of auroral radio absorption events at very high latitude, and the influence of the magnetotail |
title_full_unstemmed |
Seasonal variations in the incidence of auroral radio absorption events at very high latitude, and the influence of the magnetotail |
title_sort |
seasonal variations in the incidence of auroral radio absorption events at very high latitude, and the influence of the magnetotail |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.archives-ouvertes.fr/hal-00318295 https://hal.archives-ouvertes.fr/hal-00318295/document https://hal.archives-ouvertes.fr/hal-00318295/file/angeo-25-711-2007.pdf |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.archives-ouvertes.fr/hal-00318295 Annales Geophysicae, European Geosciences Union, 2007, 25 (3), pp.711-720 |
op_relation |
hal-00318295 https://hal.archives-ouvertes.fr/hal-00318295 https://hal.archives-ouvertes.fr/hal-00318295/document https://hal.archives-ouvertes.fr/hal-00318295/file/angeo-25-711-2007.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766201880079237120 |