A statistical analysis of low frequency geomagnetic field pulsations at two Antarctic geomagnetic observatories in the polar cap region
The aim of this study is to investigate the characteristics of low frequency ( 0.5–5 mHz) geomagnetic field fluctuations as recorded at two Antarctic stations within the polar cap: the Italian observatory Mario Zucchelli Station (TNB) and the French–Italian observatory Dome C (DMC) in order to inves...
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Online Access: | http://hdl.handle.net/2122/9802 https://doi.org/10.1016/j.asr.2013.05.001 |
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ftingv:oai:www.earth-prints.org:2122/9802 2023-05-15T14:01:37+02:00 A statistical analysis of low frequency geomagnetic field pulsations at two Antarctic geomagnetic observatories in the polar cap region Pietrolungo, M. Lepidi, S. Cafarella, L. Di Mauro, D. Pietrolungo, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Lepidi, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Cafarella, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Di Mauro, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia 2013-05-02 http://hdl.handle.net/2122/9802 https://doi.org/10.1016/j.asr.2013.05.001 en eng Elsevier Science Limited Advances in space research /52 (2013) 0273-1177 1879-1948 http://hdl.handle.net/2122/9802 doi:10.1016/j.asr.2013.05.001 restricted Solar wind-magnetosphere interactions Polar cap phenomena MHD waves and instabilities 01. Atmosphere::01.03. Magnetosphere::01.03.03. Magnetospheric physics article 2013 ftingv https://doi.org/10.1016/j.asr.2013.05.001 2022-07-29T06:06:52Z The aim of this study is to investigate the characteristics of low frequency ( 0.5–5 mHz) geomagnetic field fluctuations as recorded at two Antarctic stations within the polar cap: the Italian observatory Mario Zucchelli Station (TNB) and the French–Italian observatory Dome C (DMC) in order to investigate the spatial extension and propagation characteristics of the phenomena observed at very high latitude. The stations have approximately the same geographic latitude, but a very different corrected geomagnetic latitude, being DMC close to the geomagnetic pole and TNB closer to the auroral oval. Our study focused on power spectra, coherence and phase difference between low frequency fluctuations analyzing the horizontal H component measured during the entire year 2006. The fluctuation power behavior during the day can be explained according to the positions of the stations with respect to the polar cap; indeed in the dayside sector it is higher in the cusp region, while in the nightside sector it is higher close to the geomagnetic pole. Furthermore the study of coherent fluctuations, focusing on their phase difference, indicated that the propagation direction within the cap is variable during the day: in the dayside and nightside regions it is from the auroral oval toward the geomagnetic pole, while in the magnetic local morning and afternoon sectors it is from the geomagnetic pole toward the dawn–dusk meridian. Finally the analysis of two individual pulsation events, consisting of short duration wave packets, is shown; it confirms the statistical considerations on the propagation direction and allows to estimate the wave number and apparent phase velocity, whose values are of the order of 3–4 and 30–15 km/s, respectively. Published 853-864 1A. Geomagnetismo e Paleomagnetismo JCR Journal restricted Article in Journal/Newspaper Antarc* Antarctic Geomagnetic Pole Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) Antarctic Mario Zucchelli ENVELOPE(164.123,164.123,-74.695,-74.695) Mario Zucchelli Station ENVELOPE(164.117,164.117,-74.700,-74.700) Advances in Space Research 52 5 853 864 |
institution |
Open Polar |
collection |
Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) |
op_collection_id |
ftingv |
language |
English |
topic |
Solar wind-magnetosphere interactions Polar cap phenomena MHD waves and instabilities 01. Atmosphere::01.03. Magnetosphere::01.03.03. Magnetospheric physics |
spellingShingle |
Solar wind-magnetosphere interactions Polar cap phenomena MHD waves and instabilities 01. Atmosphere::01.03. Magnetosphere::01.03.03. Magnetospheric physics Pietrolungo, M. Lepidi, S. Cafarella, L. Di Mauro, D. A statistical analysis of low frequency geomagnetic field pulsations at two Antarctic geomagnetic observatories in the polar cap region |
topic_facet |
Solar wind-magnetosphere interactions Polar cap phenomena MHD waves and instabilities 01. Atmosphere::01.03. Magnetosphere::01.03.03. Magnetospheric physics |
description |
The aim of this study is to investigate the characteristics of low frequency ( 0.5–5 mHz) geomagnetic field fluctuations as recorded at two Antarctic stations within the polar cap: the Italian observatory Mario Zucchelli Station (TNB) and the French–Italian observatory Dome C (DMC) in order to investigate the spatial extension and propagation characteristics of the phenomena observed at very high latitude. The stations have approximately the same geographic latitude, but a very different corrected geomagnetic latitude, being DMC close to the geomagnetic pole and TNB closer to the auroral oval. Our study focused on power spectra, coherence and phase difference between low frequency fluctuations analyzing the horizontal H component measured during the entire year 2006. The fluctuation power behavior during the day can be explained according to the positions of the stations with respect to the polar cap; indeed in the dayside sector it is higher in the cusp region, while in the nightside sector it is higher close to the geomagnetic pole. Furthermore the study of coherent fluctuations, focusing on their phase difference, indicated that the propagation direction within the cap is variable during the day: in the dayside and nightside regions it is from the auroral oval toward the geomagnetic pole, while in the magnetic local morning and afternoon sectors it is from the geomagnetic pole toward the dawn–dusk meridian. Finally the analysis of two individual pulsation events, consisting of short duration wave packets, is shown; it confirms the statistical considerations on the propagation direction and allows to estimate the wave number and apparent phase velocity, whose values are of the order of 3–4 and 30–15 km/s, respectively. Published 853-864 1A. Geomagnetismo e Paleomagnetismo JCR Journal restricted |
author2 |
Pietrolungo, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Lepidi, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Cafarella, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Di Mauro, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia |
format |
Article in Journal/Newspaper |
author |
Pietrolungo, M. Lepidi, S. Cafarella, L. Di Mauro, D. |
author_facet |
Pietrolungo, M. Lepidi, S. Cafarella, L. Di Mauro, D. |
author_sort |
Pietrolungo, M. |
title |
A statistical analysis of low frequency geomagnetic field pulsations at two Antarctic geomagnetic observatories in the polar cap region |
title_short |
A statistical analysis of low frequency geomagnetic field pulsations at two Antarctic geomagnetic observatories in the polar cap region |
title_full |
A statistical analysis of low frequency geomagnetic field pulsations at two Antarctic geomagnetic observatories in the polar cap region |
title_fullStr |
A statistical analysis of low frequency geomagnetic field pulsations at two Antarctic geomagnetic observatories in the polar cap region |
title_full_unstemmed |
A statistical analysis of low frequency geomagnetic field pulsations at two Antarctic geomagnetic observatories in the polar cap region |
title_sort |
statistical analysis of low frequency geomagnetic field pulsations at two antarctic geomagnetic observatories in the polar cap region |
publisher |
Elsevier Science Limited |
publishDate |
2013 |
url |
http://hdl.handle.net/2122/9802 https://doi.org/10.1016/j.asr.2013.05.001 |
long_lat |
ENVELOPE(164.123,164.123,-74.695,-74.695) ENVELOPE(164.117,164.117,-74.700,-74.700) |
geographic |
Antarctic Mario Zucchelli Mario Zucchelli Station |
geographic_facet |
Antarctic Mario Zucchelli Mario Zucchelli Station |
genre |
Antarc* Antarctic Geomagnetic Pole |
genre_facet |
Antarc* Antarctic Geomagnetic Pole |
op_relation |
Advances in space research /52 (2013) 0273-1177 1879-1948 http://hdl.handle.net/2122/9802 doi:10.1016/j.asr.2013.05.001 |
op_rights |
restricted |
op_doi |
https://doi.org/10.1016/j.asr.2013.05.001 |
container_title |
Advances in Space Research |
container_volume |
52 |
container_issue |
5 |
container_start_page |
853 |
op_container_end_page |
864 |
_version_ |
1766271562713923584 |