An analysis of Pc3 and Pc4 pulsations at Terra Nova Bay (Antarctica)
International audience We conducted a statistical analysis of the physical characteristics of the micropulsation activity (Pc3 and Pc4 range) detected, during the austral summer 1994?95, at Terra Nova Bay (Antarctica, corrected latitude 80.0°S), a station which is few degrees poleward of those where...
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ftccsdartic:oai:HAL:hal-00316813v1 2023-11-12T04:03:57+01:00 An analysis of Pc3 and Pc4 pulsations at Terra Nova Bay (Antarctica) Villante, U. Vellante, M. de Sanctis, G. Dipartimento di Fisica 2000 https://hal.science/hal-00316813 https://hal.science/hal-00316813/document https://hal.science/hal-00316813/file/angeo-18-1412-2000.pdf en eng HAL CCSD European Geosciences Union hal-00316813 https://hal.science/hal-00316813 https://hal.science/hal-00316813/document https://hal.science/hal-00316813/file/angeo-18-1412-2000.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316813 Annales Geophysicae, 2000, 18 (11), pp.1412-1421 [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 2000 ftccsdartic 2023-10-21T23:08:05Z International audience We conducted a statistical analysis of the physical characteristics of the micropulsation activity (Pc3 and Pc4 range) detected, during the austral summer 1994?95, at Terra Nova Bay (Antarctica, corrected latitude 80.0°S), a station which is few degrees poleward of those where most of the Antarctic measurements in these frequency ranges have been performed. The emerging overview suggests that the correspondence between the pulsation power and the external parameters (solar wind speed, interplanetary magnetic field magnitude and orientation) is significantly stronger than at somewhat lower latitudes. The day-to-day power variability was found to be strictly related to the general level of the geomagnetic activity, and the power level sharply maximizes at local magnetic noon. In the Pc4 range peaks of correlation with the SW speed are found in the dawn and dusk sides of the Earth's magnetosphere and the daily variation of the polarization pattern is closely consistent with that found at auroral latitudes and at lower frequencies. In the Pc3 range the correlation coefficient between the pulsation power and the SW speed has maximum values in the local morning, and the frequency of selected events reveals a strong IMF control during closed magnetospheric conditions. The local time dependence of the correlation coefficient between the pulsation power and the cone angle reveals an additional control by the IMF orientation, which becomes more explicit around local noon. Key words: Magnetospheric physics (magnetopause, cusp, and boundary layers) Article in Journal/Newspaper Antarc* Antarctic Antarctica Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic The Antarctic Austral Terra Nova Bay |
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 Villante, U. Vellante, M. de Sanctis, G. An analysis of Pc3 and Pc4 pulsations at Terra Nova Bay (Antarctica) |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience We conducted a statistical analysis of the physical characteristics of the micropulsation activity (Pc3 and Pc4 range) detected, during the austral summer 1994?95, at Terra Nova Bay (Antarctica, corrected latitude 80.0°S), a station which is few degrees poleward of those where most of the Antarctic measurements in these frequency ranges have been performed. The emerging overview suggests that the correspondence between the pulsation power and the external parameters (solar wind speed, interplanetary magnetic field magnitude and orientation) is significantly stronger than at somewhat lower latitudes. The day-to-day power variability was found to be strictly related to the general level of the geomagnetic activity, and the power level sharply maximizes at local magnetic noon. In the Pc4 range peaks of correlation with the SW speed are found in the dawn and dusk sides of the Earth's magnetosphere and the daily variation of the polarization pattern is closely consistent with that found at auroral latitudes and at lower frequencies. In the Pc3 range the correlation coefficient between the pulsation power and the SW speed has maximum values in the local morning, and the frequency of selected events reveals a strong IMF control during closed magnetospheric conditions. The local time dependence of the correlation coefficient between the pulsation power and the cone angle reveals an additional control by the IMF orientation, which becomes more explicit around local noon. Key words: Magnetospheric physics (magnetopause, cusp, and boundary layers) |
author2 |
Dipartimento di Fisica |
format |
Article in Journal/Newspaper |
author |
Villante, U. Vellante, M. de Sanctis, G. |
author_facet |
Villante, U. Vellante, M. de Sanctis, G. |
author_sort |
Villante, U. |
title |
An analysis of Pc3 and Pc4 pulsations at Terra Nova Bay (Antarctica) |
title_short |
An analysis of Pc3 and Pc4 pulsations at Terra Nova Bay (Antarctica) |
title_full |
An analysis of Pc3 and Pc4 pulsations at Terra Nova Bay (Antarctica) |
title_fullStr |
An analysis of Pc3 and Pc4 pulsations at Terra Nova Bay (Antarctica) |
title_full_unstemmed |
An analysis of Pc3 and Pc4 pulsations at Terra Nova Bay (Antarctica) |
title_sort |
analysis of pc3 and pc4 pulsations at terra nova bay (antarctica) |
publisher |
HAL CCSD |
publishDate |
2000 |
url |
https://hal.science/hal-00316813 https://hal.science/hal-00316813/document https://hal.science/hal-00316813/file/angeo-18-1412-2000.pdf |
geographic |
Antarctic The Antarctic Austral Terra Nova Bay |
geographic_facet |
Antarctic The Antarctic Austral Terra Nova Bay |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316813 Annales Geophysicae, 2000, 18 (11), pp.1412-1421 |
op_relation |
hal-00316813 https://hal.science/hal-00316813 https://hal.science/hal-00316813/document https://hal.science/hal-00316813/file/angeo-18-1412-2000.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782339821475201024 |