Propagation of low frequency geomagnetic field fluctuations in Antarctica: comparison between two polar cap stations
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 coord...
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ftcopernicus:oai:publications.copernicus.org:angeo36275 2023-05-15T13:36:36+02:00 Propagation of low frequency geomagnetic field fluctuations in Antarctica: comparison between two polar cap stations Santarelli, L. Lepidi, S. Cafarella, L. 2018-09-27 application/pdf https://doi.org/10.5194/angeo-25-2405-2007 https://angeo.copernicus.org/articles/25/2405/2007/ eng eng doi:10.5194/angeo-25-2405-2007 https://angeo.copernicus.org/articles/25/2405/2007/ eISSN: 1432-0576 Text 2018 ftcopernicus https://doi.org/10.5194/angeo-25-2405-2007 2020-07-20T16:26:58Z 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. Text Antarc* Antarctic Antarctica Copernicus Publications: E-Journals Antarctic Mario Zucchelli ENVELOPE(164.123,164.123,-74.695,-74.695) Mario Zucchelli Station ENVELOPE(164.117,164.117,-74.700,-74.700) Scott Base ENVELOPE(166.766,166.766,-77.849,-77.849) Annales Geophysicae 25 11 2405 2412 |
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Open Polar |
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Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
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. |
format |
Text |
author |
Santarelli, L. Lepidi, S. Cafarella, L. |
spellingShingle |
Santarelli, L. Lepidi, S. Cafarella, L. Propagation of low frequency geomagnetic field fluctuations in Antarctica: comparison between two polar cap stations |
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 |
publishDate |
2018 |
url |
https://doi.org/10.5194/angeo-25-2405-2007 https://angeo.copernicus.org/articles/25/2405/2007/ |
long_lat |
ENVELOPE(164.123,164.123,-74.695,-74.695) ENVELOPE(164.117,164.117,-74.700,-74.700) ENVELOPE(166.766,166.766,-77.849,-77.849) |
geographic |
Antarctic Mario Zucchelli Mario Zucchelli Station Scott Base |
geographic_facet |
Antarctic Mario Zucchelli Mario Zucchelli Station Scott Base |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
eISSN: 1432-0576 |
op_relation |
doi:10.5194/angeo-25-2405-2007 https://angeo.copernicus.org/articles/25/2405/2007/ |
op_doi |
https://doi.org/10.5194/angeo-25-2405-2007 |
container_title |
Annales Geophysicae |
container_volume |
25 |
container_issue |
11 |
container_start_page |
2405 |
op_container_end_page |
2412 |
_version_ |
1766081489969086464 |