Propagation of low frequency geomagnetic field fluctuations in Antarctica: comparison between two polar cap stations
International audience We conduct a statistical analysis of the coherence and phase difference of low frequency geomagnetic fluctuations between two Antarctic stations, Mario Zucchelli Station (geographic coordinates: 74.7° S, 164.1° E; corrected geomagnetic coordinates: 80.0° S, 307.7° E) and Scott...
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ftccsdartic:oai:HAL:hal-00318411v1 2023-11-12T04:05:21+01:00 Propagation of low frequency geomagnetic field fluctuations in Antarctica: comparison between two polar cap stations Santarelli, L. Lepidi, S. Cafarella, L. Istituto Nazionale di Geofisica e Vulcanologia 2007-11-29 https://hal.science/hal-00318411 https://hal.science/hal-00318411/document https://hal.science/hal-00318411/file/angeo-25-2405-2007.pdf en eng HAL CCSD European Geosciences Union hal-00318411 https://hal.science/hal-00318411 https://hal.science/hal-00318411/document https://hal.science/hal-00318411/file/angeo-25-2405-2007.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00318411 Annales Geophysicae, 2007, 25 (11), pp.2405-2412 [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 2007 ftccsdartic 2023-10-21T23:06:31Z International audience We conduct a statistical analysis of the coherence and phase difference of low frequency geomagnetic fluctuations between two Antarctic stations, Mario Zucchelli Station (geographic coordinates: 74.7° S, 164.1° E; corrected geomagnetic coordinates: 80.0° S, 307.7° E) and Scott Base (geographic coordinates: 77.8° S 166.8° E; corrected geomagnetic coordinates: 80.0° S 326.5° E), both located in the polar cap. Due to the relative position of the stations, whose displacement is essentially along a geomagnetic parallel, the phase difference analysis allows to determine the direction of azimuthal propagation of geomagnetic fluctuations. The results show that coherent fluctuations are essentially detectable around local geomagnetic midnight and, in a minor extent, around noon; moreover, the phase difference reverses in the night time hours, indicating a propagation direction away from midnight, and also around local geomagnetic noon, indicating a propagation direction away from the subsolar point. The nigh time phase reversal is more clear for southward interplanetary magnetic field conditions, suggesting a relation with substorm activity. The introduction, in this analysis, of the Interplanetary Magnetic Field conditions, gave interesting results, indicating a relation with substorm activity during nighttime hours. We also conducted a study of three individual pulsation events in order to find a correspondence with the statistical behaviour. In particular, a peculiar event, characterized by quiet magnetospheric and northward interplanetary magnetic field conditions, shows a clear example of waves propagating away from the local geomagnetic noon; two more events, occurring during southward interplanetary magnetic field conditions, in one case even during a moderate storm, show waves propagating away from the local geomagnetic midnight. Article in Journal/Newspaper Antarc* Antarctic Antarctica Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Scott Base ENVELOPE(166.766,166.766,-77.849,-77.849) Mario Zucchelli ENVELOPE(164.123,164.123,-74.695,-74.695) Mario Zucchelli Station ENVELOPE(164.117,164.117,-74.700,-74.700) |
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 Santarelli, L. Lepidi, S. Cafarella, L. Propagation of low frequency geomagnetic field fluctuations in Antarctica: comparison between two polar cap stations |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience We conduct a statistical analysis of the coherence and phase difference of low frequency geomagnetic fluctuations between two Antarctic stations, Mario Zucchelli Station (geographic coordinates: 74.7° S, 164.1° E; corrected geomagnetic coordinates: 80.0° S, 307.7° E) and Scott Base (geographic coordinates: 77.8° S 166.8° E; corrected geomagnetic coordinates: 80.0° S 326.5° E), both located in the polar cap. Due to the relative position of the stations, whose displacement is essentially along a geomagnetic parallel, the phase difference analysis allows to determine the direction of azimuthal propagation of geomagnetic fluctuations. The results show that coherent fluctuations are essentially detectable around local geomagnetic midnight and, in a minor extent, around noon; moreover, the phase difference reverses in the night time hours, indicating a propagation direction away from midnight, and also around local geomagnetic noon, indicating a propagation direction away from the subsolar point. The nigh time phase reversal is more clear for southward interplanetary magnetic field conditions, suggesting a relation with substorm activity. The introduction, in this analysis, of the Interplanetary Magnetic Field conditions, gave interesting results, indicating a relation with substorm activity during nighttime hours. We also conducted a study of three individual pulsation events in order to find a correspondence with the statistical behaviour. In particular, a peculiar event, characterized by quiet magnetospheric and northward interplanetary magnetic field conditions, shows a clear example of waves propagating away from the local geomagnetic noon; two more events, occurring during southward interplanetary magnetic field conditions, in one case even during a moderate storm, show waves propagating away from the local geomagnetic midnight. |
author2 |
Istituto Nazionale di Geofisica e Vulcanologia |
format |
Article in Journal/Newspaper |
author |
Santarelli, L. Lepidi, S. Cafarella, L. |
author_facet |
Santarelli, L. Lepidi, S. Cafarella, L. |
author_sort |
Santarelli, L. |
title |
Propagation of low frequency geomagnetic field fluctuations in Antarctica: comparison between two polar cap stations |
title_short |
Propagation of low frequency geomagnetic field fluctuations in Antarctica: comparison between two polar cap stations |
title_full |
Propagation of low frequency geomagnetic field fluctuations in Antarctica: comparison between two polar cap stations |
title_fullStr |
Propagation of low frequency geomagnetic field fluctuations in Antarctica: comparison between two polar cap stations |
title_full_unstemmed |
Propagation of low frequency geomagnetic field fluctuations in Antarctica: comparison between two polar cap stations |
title_sort |
propagation of low frequency geomagnetic field fluctuations in antarctica: comparison between two polar cap stations |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.science/hal-00318411 https://hal.science/hal-00318411/document https://hal.science/hal-00318411/file/angeo-25-2405-2007.pdf |
long_lat |
ENVELOPE(166.766,166.766,-77.849,-77.849) ENVELOPE(164.123,164.123,-74.695,-74.695) ENVELOPE(164.117,164.117,-74.700,-74.700) |
geographic |
Antarctic Scott Base Mario Zucchelli Mario Zucchelli Station |
geographic_facet |
Antarctic Scott Base Mario Zucchelli Mario Zucchelli Station |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00318411 Annales Geophysicae, 2007, 25 (11), pp.2405-2412 |
op_relation |
hal-00318411 https://hal.science/hal-00318411 https://hal.science/hal-00318411/document https://hal.science/hal-00318411/file/angeo-25-2405-2007.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782341962476552192 |