Polar cap influx
International audience This study uses digital ionosonde data from a cusp latitude station (Cambridge Bay, 77° CGM lat.) to study the convection into the polar cap. Days when the IMF magnetic field was relatively steady were used. On many days it was possible to distinguish an interval near noon MLT...
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ftinsu:oai:HAL:hal-00317826v1 2023-11-12T04:15:33+01:00 Polar cap influx Macdougall, J. Jayachandran, P. T. Dept. Electrical Engineering University of Western Ontario (UWO) 2005-07-28 https://hal.science/hal-00317826 https://hal.science/hal-00317826/document https://hal.science/hal-00317826/file/angeo-23-1755-2005.pdf en eng HAL CCSD European Geosciences Union hal-00317826 https://hal.science/hal-00317826 https://hal.science/hal-00317826/document https://hal.science/hal-00317826/file/angeo-23-1755-2005.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317826 Annales Geophysicae, 2005, 23 (5), pp.1755-1761 [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 2005 ftinsu 2023-10-25T16:25:11Z International audience This study uses digital ionosonde data from a cusp latitude station (Cambridge Bay, 77° CGM lat.) to study the convection into the polar cap. Days when the IMF magnetic field was relatively steady were used. On many days it was possible to distinguish an interval near noon MLT when the ionosonde data had a different character from that at earlier and later times. Based on our data, and other published measurements, we used the interval 10:00-13:00 MLT as the cusp interval and calculated the convection into the polar cap in this interval. The integrated convection accounted for only ~1/3 of the open polar cap flux. If the convection through the prenoon/postnoon regions on either side of the cusp was calculated the remaining 2/3 of the flux could be accounted for. The characteristics of the prenoon/postnoon regions were different from the cusp region, and we attribute this to transient flank merging versus more steady frontside merging for the cusp. Keywords. Ionosphere (Plasma convection) Magnetospheric physics (Polar cap phenomenon) Article in Journal/Newspaper Cambridge Bay Institut national des sciences de l'Univers: HAL-INSU Cambridge Bay ENVELOPE(-105.130,-105.130,69.037,69.037) |
institution |
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 |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Macdougall, J. Jayachandran, P. T. Polar cap influx |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience This study uses digital ionosonde data from a cusp latitude station (Cambridge Bay, 77° CGM lat.) to study the convection into the polar cap. Days when the IMF magnetic field was relatively steady were used. On many days it was possible to distinguish an interval near noon MLT when the ionosonde data had a different character from that at earlier and later times. Based on our data, and other published measurements, we used the interval 10:00-13:00 MLT as the cusp interval and calculated the convection into the polar cap in this interval. The integrated convection accounted for only ~1/3 of the open polar cap flux. If the convection through the prenoon/postnoon regions on either side of the cusp was calculated the remaining 2/3 of the flux could be accounted for. The characteristics of the prenoon/postnoon regions were different from the cusp region, and we attribute this to transient flank merging versus more steady frontside merging for the cusp. Keywords. Ionosphere (Plasma convection) Magnetospheric physics (Polar cap phenomenon) |
author2 |
Dept. Electrical Engineering University of Western Ontario (UWO) |
format |
Article in Journal/Newspaper |
author |
Macdougall, J. Jayachandran, P. T. |
author_facet |
Macdougall, J. Jayachandran, P. T. |
author_sort |
Macdougall, J. |
title |
Polar cap influx |
title_short |
Polar cap influx |
title_full |
Polar cap influx |
title_fullStr |
Polar cap influx |
title_full_unstemmed |
Polar cap influx |
title_sort |
polar cap influx |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.science/hal-00317826 https://hal.science/hal-00317826/document https://hal.science/hal-00317826/file/angeo-23-1755-2005.pdf |
long_lat |
ENVELOPE(-105.130,-105.130,69.037,69.037) |
geographic |
Cambridge Bay |
geographic_facet |
Cambridge Bay |
genre |
Cambridge Bay |
genre_facet |
Cambridge Bay |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317826 Annales Geophysicae, 2005, 23 (5), pp.1755-1761 |
op_relation |
hal-00317826 https://hal.science/hal-00317826 https://hal.science/hal-00317826/document https://hal.science/hal-00317826/file/angeo-23-1755-2005.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782332824143003648 |