A possible origin of dayside Pc1 magnetic pulsations observed at high latitudes
International audience Induction magnetometer observations of dayside Pc1 activity at Barentsburg (BAB, Spitsbergen archipelago, 78.05°N, 14.12°E) are combined with data from two magnetometers located in Scandinavia and the Kola peninsula. Seven events with very large negative IMF B z components wer...
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ftccsdartic:oai:HAL:hal-00317600v1 2023-11-12T04:15:06+01:00 A possible origin of dayside Pc1 magnetic pulsations observed at high latitudes Safargaleev, V. Serebryanskaya, A. Koustov, A. Lester, M. Pchelkina, E. Vasilyev, A. Polar Geophysical Institute of Russian Academy of Sciences (PGI) Russian Academy of Sciences Moscow (RAS) Swedish Institute of Space Physics Kiruna (IRF) University of Saskatchewan Saskatoon (U of S) University of Leicester 2004-09-07 https://hal.science/hal-00317600 https://hal.science/hal-00317600/document https://hal.science/hal-00317600/file/angeo-22-2997-2004.pdf en eng HAL CCSD European Geosciences Union hal-00317600 https://hal.science/hal-00317600 https://hal.science/hal-00317600/document https://hal.science/hal-00317600/file/angeo-22-2997-2004.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317600 Annales Geophysicae, 2004, 22 (8), pp.2997-3008 [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 2023-10-21T23:07:19Z International audience Induction magnetometer observations of dayside Pc1 activity at Barentsburg (BAB, Spitsbergen archipelago, 78.05°N, 14.12°E) are combined with data from two magnetometers located in Scandinavia and the Kola peninsula. Seven events with very large negative IMF B z components were considered. For all of the events, the cusp location was expected to be significantly shifted equatorward from the statistical position such that the BAB magnetometer was located well inside the polar cap. The DMSP particle data indicated that the BAB magnetometer was indeed inside the polar cap, whereas other magnetometers were collocated with the ionospheric projections of the cusp, the low-latitude boundary layer or the boundary plasma sheet. Pc1 magnetic pulsations were observed only at BAB. In three cases, for which SuperDARN convection data were available, the Pc1 activity correlated with intervals of large-scale convection reconfiguration, such that the plasma flow crossing the BAB location was associated with newly-reconnected magnetic flux tubes drifting tailward. The convection reconfigurations were in response to a decrease in the IMF B y component. We argue that the source of the observed Pc1 pulsations is anisotropic plasma of the depletion layer within the magnetosheath. The plasma anisotropy supports the excitation of electromagnetic ion cyclotron waves that are detectable with a ground-based magnetometer when the flux tubes containing the unstable plasma become connected to the Earth's ionosphere in the course of the dayside reconnection processes. Article in Journal/Newspaper Barentsburg kola peninsula Spitsbergen Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Kola Peninsula Barentsburg ENVELOPE(14.212,14.212,78.064,78.064) |
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 Safargaleev, V. Serebryanskaya, A. Koustov, A. Lester, M. Pchelkina, E. Vasilyev, A. A possible origin of dayside Pc1 magnetic pulsations observed at high latitudes |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Induction magnetometer observations of dayside Pc1 activity at Barentsburg (BAB, Spitsbergen archipelago, 78.05°N, 14.12°E) are combined with data from two magnetometers located in Scandinavia and the Kola peninsula. Seven events with very large negative IMF B z components were considered. For all of the events, the cusp location was expected to be significantly shifted equatorward from the statistical position such that the BAB magnetometer was located well inside the polar cap. The DMSP particle data indicated that the BAB magnetometer was indeed inside the polar cap, whereas other magnetometers were collocated with the ionospheric projections of the cusp, the low-latitude boundary layer or the boundary plasma sheet. Pc1 magnetic pulsations were observed only at BAB. In three cases, for which SuperDARN convection data were available, the Pc1 activity correlated with intervals of large-scale convection reconfiguration, such that the plasma flow crossing the BAB location was associated with newly-reconnected magnetic flux tubes drifting tailward. The convection reconfigurations were in response to a decrease in the IMF B y component. We argue that the source of the observed Pc1 pulsations is anisotropic plasma of the depletion layer within the magnetosheath. The plasma anisotropy supports the excitation of electromagnetic ion cyclotron waves that are detectable with a ground-based magnetometer when the flux tubes containing the unstable plasma become connected to the Earth's ionosphere in the course of the dayside reconnection processes. |
author2 |
Polar Geophysical Institute of Russian Academy of Sciences (PGI) Russian Academy of Sciences Moscow (RAS) Swedish Institute of Space Physics Kiruna (IRF) University of Saskatchewan Saskatoon (U of S) University of Leicester |
format |
Article in Journal/Newspaper |
author |
Safargaleev, V. Serebryanskaya, A. Koustov, A. Lester, M. Pchelkina, E. Vasilyev, A. |
author_facet |
Safargaleev, V. Serebryanskaya, A. Koustov, A. Lester, M. Pchelkina, E. Vasilyev, A. |
author_sort |
Safargaleev, V. |
title |
A possible origin of dayside Pc1 magnetic pulsations observed at high latitudes |
title_short |
A possible origin of dayside Pc1 magnetic pulsations observed at high latitudes |
title_full |
A possible origin of dayside Pc1 magnetic pulsations observed at high latitudes |
title_fullStr |
A possible origin of dayside Pc1 magnetic pulsations observed at high latitudes |
title_full_unstemmed |
A possible origin of dayside Pc1 magnetic pulsations observed at high latitudes |
title_sort |
possible origin of dayside pc1 magnetic pulsations observed at high latitudes |
publisher |
HAL CCSD |
publishDate |
2004 |
url |
https://hal.science/hal-00317600 https://hal.science/hal-00317600/document https://hal.science/hal-00317600/file/angeo-22-2997-2004.pdf |
long_lat |
ENVELOPE(14.212,14.212,78.064,78.064) |
geographic |
Kola Peninsula Barentsburg |
geographic_facet |
Kola Peninsula Barentsburg |
genre |
Barentsburg kola peninsula Spitsbergen |
genre_facet |
Barentsburg kola peninsula Spitsbergen |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317600 Annales Geophysicae, 2004, 22 (8), pp.2997-3008 |
op_relation |
hal-00317600 https://hal.science/hal-00317600 https://hal.science/hal-00317600/document https://hal.science/hal-00317600/file/angeo-22-2997-2004.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782332537148801024 |