Coherent transmission of upstream waves to polar latitudes through magnetotail lobes
We studied the transmission of upstream waves to polar latitudes through the Earth’s magnetotail lobes, statistically examining the correspondence between magnetospheric waves detected by Cluster and geomagnetic fluctuations at Dome C, in Antarctica (λ ~ 88.84°S). The analysis was restricted to time...
Published in: | Journal of Geophysical Research: Space Physics |
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Online Access: | http://hdl.handle.net/2122/12106 https://doi.org/10.1002/2012JA018472 |
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ftingv:oai:www.earth-prints.org:2122/12106 2023-05-15T14:01:37+02:00 Coherent transmission of upstream waves to polar latitudes through magnetotail lobes Regi, M. Francia, P. De Lauretis, M. Glassmeier, K. H. Villante, U. #PLACEHOLDER_PARENT_METADATA_VALUE# 2013 http://hdl.handle.net/2122/12106 https://doi.org/10.1002/2012JA018472 en eng Journal of Geophysical Research-Space Physics /118 (2013) http://hdl.handle.net/2122/12106 doi:10.1002/2012JA018472 restricted article 2013 ftingv https://doi.org/10.1002/2012JA018472 2022-07-29T06:07:38Z We studied the transmission of upstream waves to polar latitudes through the Earth’s magnetotail lobes, statistically examining the correspondence between magnetospheric waves detected by Cluster and geomagnetic fluctuations at Dome C, in Antarctica (λ ~ 88.84°S). The analysis was restricted to time intervals when Cluster was in the southern magnetotail lobe, on field lines with footprints close to Dome C. During the day, the coherence between geomagnetic and magnetospheric signals is significantly high, indicating a common source, in the frequency range 20–35 mHz, at typical upstream wave frequencies, and particularly in the early morning sector, when a higher occurrence of upstream waves is typically expected, and Dome C is relatively unaffected by dayside phenomena. The highest coherence is observed between fluctuations in the horizontal components on the ground and transversal components of the magnetospheric field. Such results suggest that upstream waves, convected by the solar wind along the magnetosphere flanks and transmitted as compressional waves into the magnetotail lobes, are partially converted to shear Alfven waves and propagate, traveling along the open field lines, up to the polar cap. A case study provides explicit evidence of the proposed path. It shows that fluctuations in the D component are delayed with respect to the corresponding waves in the transversal field measured by Cluster; the delay time being consistent with the ground propagation of Alfven waves along the field line connected with the satellite position; the weak correspondence with the H component suggests that the local ionosphere does not rotate efficiently the magnetospheric signals. Published 6955-6963 1A. Geomagnetismo e Paleomagnetismo JCR Journal Article in Journal/Newspaper Antarc* Antarctica Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) Journal of Geophysical Research: Space Physics 118 11 6955 6963 |
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Open Polar |
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Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) |
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language |
English |
description |
We studied the transmission of upstream waves to polar latitudes through the Earth’s magnetotail lobes, statistically examining the correspondence between magnetospheric waves detected by Cluster and geomagnetic fluctuations at Dome C, in Antarctica (λ ~ 88.84°S). The analysis was restricted to time intervals when Cluster was in the southern magnetotail lobe, on field lines with footprints close to Dome C. During the day, the coherence between geomagnetic and magnetospheric signals is significantly high, indicating a common source, in the frequency range 20–35 mHz, at typical upstream wave frequencies, and particularly in the early morning sector, when a higher occurrence of upstream waves is typically expected, and Dome C is relatively unaffected by dayside phenomena. The highest coherence is observed between fluctuations in the horizontal components on the ground and transversal components of the magnetospheric field. Such results suggest that upstream waves, convected by the solar wind along the magnetosphere flanks and transmitted as compressional waves into the magnetotail lobes, are partially converted to shear Alfven waves and propagate, traveling along the open field lines, up to the polar cap. A case study provides explicit evidence of the proposed path. It shows that fluctuations in the D component are delayed with respect to the corresponding waves in the transversal field measured by Cluster; the delay time being consistent with the ground propagation of Alfven waves along the field line connected with the satellite position; the weak correspondence with the H component suggests that the local ionosphere does not rotate efficiently the magnetospheric signals. Published 6955-6963 1A. Geomagnetismo e Paleomagnetismo JCR Journal |
author2 |
#PLACEHOLDER_PARENT_METADATA_VALUE# |
format |
Article in Journal/Newspaper |
author |
Regi, M. Francia, P. De Lauretis, M. Glassmeier, K. H. Villante, U. |
spellingShingle |
Regi, M. Francia, P. De Lauretis, M. Glassmeier, K. H. Villante, U. Coherent transmission of upstream waves to polar latitudes through magnetotail lobes |
author_facet |
Regi, M. Francia, P. De Lauretis, M. Glassmeier, K. H. Villante, U. |
author_sort |
Regi, M. |
title |
Coherent transmission of upstream waves to polar latitudes through magnetotail lobes |
title_short |
Coherent transmission of upstream waves to polar latitudes through magnetotail lobes |
title_full |
Coherent transmission of upstream waves to polar latitudes through magnetotail lobes |
title_fullStr |
Coherent transmission of upstream waves to polar latitudes through magnetotail lobes |
title_full_unstemmed |
Coherent transmission of upstream waves to polar latitudes through magnetotail lobes |
title_sort |
coherent transmission of upstream waves to polar latitudes through magnetotail lobes |
publishDate |
2013 |
url |
http://hdl.handle.net/2122/12106 https://doi.org/10.1002/2012JA018472 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
Journal of Geophysical Research-Space Physics /118 (2013) http://hdl.handle.net/2122/12106 doi:10.1002/2012JA018472 |
op_rights |
restricted |
op_doi |
https://doi.org/10.1002/2012JA018472 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
118 |
container_issue |
11 |
container_start_page |
6955 |
op_container_end_page |
6963 |
_version_ |
1766271572434223104 |