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
Abstract. 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 sta...
Published in: | Annales Geophysicae |
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1999
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Online Access: | https://www.openaccessrepository.it/record/79975 https://doi.org/10.1007/s00585-999-1245-4 |
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ftopenaccessrep:oai:zenodo.org:79975 2023-10-25T01:30:23+02:00 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 S. Lepidi P. Francia U. Villante A. Meloni A. J. Lazarus R. P. Lepping 1999-10-01 https://www.openaccessrepository.it/record/79975 https://doi.org/10.1007/s00585-999-1245-4 eng eng url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/79975 doi:10.1007/s00585-999-1245-4 info:eu-repo/semantics/openAccess NEANIAS Atmospheric Research Community Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geology Astronomy and Astrophysics info:eu-repo/semantics/article publication-article 1999 ftopenaccessrep https://doi.org/10.1007/s00585-999-1245-4 2023-09-26T22:21:13Z Abstract. 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 Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository Antarctic Terra Nova Bay Annales Geophysicae 17 10 1245 1250 |
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Open Polar |
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Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository |
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ftopenaccessrep |
language |
English |
topic |
NEANIAS Atmospheric Research Community Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geology Astronomy and Astrophysics |
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NEANIAS Atmospheric Research Community Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geology Astronomy and Astrophysics S. Lepidi P. Francia U. Villante A. Meloni A. J. Lazarus R. P. Lepping 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 |
NEANIAS Atmospheric Research Community Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geology Astronomy and Astrophysics |
description |
Abstract. 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) |
format |
Article in Journal/Newspaper |
author |
S. Lepidi P. Francia U. Villante A. Meloni A. J. Lazarus R. P. Lepping |
author_facet |
S. Lepidi P. Francia U. Villante A. Meloni A. J. Lazarus R. P. Lepping |
author_sort |
S. Lepidi |
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 |
publishDate |
1999 |
url |
https://www.openaccessrepository.it/record/79975 https://doi.org/10.1007/s00585-999-1245-4 |
geographic |
Antarctic Terra Nova Bay |
geographic_facet |
Antarctic Terra Nova Bay |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/79975 doi:10.1007/s00585-999-1245-4 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1007/s00585-999-1245-4 |
container_title |
Annales Geophysicae |
container_volume |
17 |
container_issue |
10 |
container_start_page |
1245 |
op_container_end_page |
1250 |
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1780739021046022144 |