The Earth's passage of the April 11, 1997 coronal ejecta: geomagnetic field fluctuations at high and low latitude during northward interplanetary magnetic field conditions
International audience An analysis of the low frequency geomagnetic field fluctuations at an Antarctic (Terra Nova Bay) and a low latitude (L'Aquila, Italy) station during the Earth's passage of a coronal ejecta on April 11, 1997 shows that major solar wind pressure variations were followe...
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ftccsdartic:oai:HAL:hal-00316670v1 2023-11-12T04:02:16+01:00 The Earth's passage of the April 11, 1997 coronal ejecta: geomagnetic field fluctuations at high and low latitude during northward interplanetary magnetic field conditions Lepidi, S. Francia, P. Villante, U. Meloni, A. Lazarus, A. J. Lepping, R. P. Dipartimento di Fisica Istituto Nazionale di Geofisica Center for Space Research Cambridge (CSR) Massachusetts Institute of Technology (MIT) GSFC Laboratory for Extraterrestrial Physics NASA Goddard Space Flight Center (GSFC) 1999 https://hal.science/hal-00316670 https://hal.science/hal-00316670/document https://hal.science/hal-00316670/file/angeo-17-1245-1999.pdf en eng HAL CCSD European Geosciences Union hal-00316670 https://hal.science/hal-00316670 https://hal.science/hal-00316670/document https://hal.science/hal-00316670/file/angeo-17-1245-1999.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316670 Annales Geophysicae, 1999, 17 (10), pp.1245-1250 [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 1999 ftccsdartic 2023-10-21T23:08:17Z International audience An analysis of the low frequency geomagnetic field fluctuations at an Antarctic (Terra Nova Bay) and a low latitude (L'Aquila, Italy) station during the Earth's passage of a coronal ejecta on April 11, 1997 shows that major solar wind pressure variations were followed at both stations by a high fluctuation level. During northward interplanetary magnetic field conditions and when Terra Nova Bay is close to the local geomagnetic noon, coherent fluctuations, at the same frequency (3.6 mHz) and with polarization characteristics indicating an antisunward propagation, were observed simultaneously at the two stations. An analysis of simultaneous measurements from geosynchronous satellites shows evidence for pulsations at approximately the same frequencies also in the magnetospheric field. The observed waves might then be interpreted as oscillation modes, triggered by an external stimulation, extending to a major portion of the Earth's magnetosphere. Key words. Magnetospheric physics (MHD waves and instabilities; solar wind-magnetosphere interactions) Article in Journal/Newspaper Antarc* Antarctic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Terra Nova Bay |
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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 Lepidi, S. Francia, P. Villante, U. Meloni, A. Lazarus, A. J. Lepping, R. P. The Earth's passage of the April 11, 1997 coronal ejecta: geomagnetic field fluctuations at high and low latitude during northward interplanetary magnetic field conditions |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience An analysis of the low frequency geomagnetic field fluctuations at an Antarctic (Terra Nova Bay) and a low latitude (L'Aquila, Italy) station during the Earth's passage of a coronal ejecta on April 11, 1997 shows that major solar wind pressure variations were followed at both stations by a high fluctuation level. During northward interplanetary magnetic field conditions and when Terra Nova Bay is close to the local geomagnetic noon, coherent fluctuations, at the same frequency (3.6 mHz) and with polarization characteristics indicating an antisunward propagation, were observed simultaneously at the two stations. An analysis of simultaneous measurements from geosynchronous satellites shows evidence for pulsations at approximately the same frequencies also in the magnetospheric field. The observed waves might then be interpreted as oscillation modes, triggered by an external stimulation, extending to a major portion of the Earth's magnetosphere. Key words. Magnetospheric physics (MHD waves and instabilities; solar wind-magnetosphere interactions) |
author2 |
Dipartimento di Fisica Istituto Nazionale di Geofisica Center for Space Research Cambridge (CSR) Massachusetts Institute of Technology (MIT) GSFC Laboratory for Extraterrestrial Physics NASA Goddard Space Flight Center (GSFC) |
format |
Article in Journal/Newspaper |
author |
Lepidi, S. Francia, P. Villante, U. Meloni, A. Lazarus, A. J. Lepping, R. P. |
author_facet |
Lepidi, S. Francia, P. Villante, U. Meloni, A. Lazarus, A. J. Lepping, R. P. |
author_sort |
Lepidi, S. |
title |
The Earth's passage of the April 11, 1997 coronal ejecta: geomagnetic field fluctuations at high and low latitude during northward interplanetary magnetic field conditions |
title_short |
The Earth's passage of the April 11, 1997 coronal ejecta: geomagnetic field fluctuations at high and low latitude during northward interplanetary magnetic field conditions |
title_full |
The Earth's passage of the April 11, 1997 coronal ejecta: geomagnetic field fluctuations at high and low latitude during northward interplanetary magnetic field conditions |
title_fullStr |
The Earth's passage of the April 11, 1997 coronal ejecta: geomagnetic field fluctuations at high and low latitude during northward interplanetary magnetic field conditions |
title_full_unstemmed |
The Earth's passage of the April 11, 1997 coronal ejecta: geomagnetic field fluctuations at high and low latitude during northward interplanetary magnetic field conditions |
title_sort |
earth's passage of the april 11, 1997 coronal ejecta: geomagnetic field fluctuations at high and low latitude during northward interplanetary magnetic field conditions |
publisher |
HAL CCSD |
publishDate |
1999 |
url |
https://hal.science/hal-00316670 https://hal.science/hal-00316670/document https://hal.science/hal-00316670/file/angeo-17-1245-1999.pdf |
geographic |
Antarctic Terra Nova Bay |
geographic_facet |
Antarctic Terra Nova Bay |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316670 Annales Geophysicae, 1999, 17 (10), pp.1245-1250 |
op_relation |
hal-00316670 https://hal.science/hal-00316670 https://hal.science/hal-00316670/document https://hal.science/hal-00316670/file/angeo-17-1245-1999.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782334021696487424 |