Signatures of wedgelets over Fennoscandia during the St Patrick s Day Storm 2015
During the long main phase of the St Patrick's Day storm on March 17, 2015, we found three separate enhancements of the westward electrojet. These enhancements are observed in the ionospheric equivalent currents computed using geomagnetic data over Fennoscandia. Using data from the IMAGE magnet...
Published in: | Journal of Space Weather and Space Climate |
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Umeå universitet, Institutionen för fysik
2023
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Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-212096 https://doi.org/10.1051/swsc/2023018 |
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ftumeauniv:oai:DiVA.org:umu-212096 2023-12-10T09:38:51+01:00 Signatures of wedgelets over Fennoscandia during the St Patrick s Day Storm 2015 Schillings, Audrey Palin, Laurianne Bower, Gemma E. Opgenoorth, Hermann J. Milan, Steve E. Kauristie, Kirsti Juusola, Liisa Reeves, Geoff D. Henderson, Mike G. Paxton, Larry J. Lester, Mark Hamrin, Maria Van De Kamp, Max 2023 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-212096 https://doi.org/10.1051/swsc/2023018 eng eng Umeå universitet, Institutionen för fysik School of Physics and Astronomy, University of Leicester, United Kingdom Thales Alenia Space, Toulouse, France Finnish Meteorological Institute, Dynamicum Erik Palménin aukio 1, Helsinki, Finland Space Science and Applications Group, Los Alamos National Laboratory, NM, Los Alamos, United States Johns Hopkins University Applied Physics Laboratory, Laurel, United States Journal of Space Weather and Space Climate, 2023, 13, orcid:0000-0001-6968-5405 orcid:0000-0001-7573-5165 orcid:0000-0002-2043-4442 http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-212096 doi:10.1051/swsc/2023018 ISI:001010354000001 Scopus 2-s2.0-85163322164 info:eu-repo/semantics/openAccess Ionospheric equivalent currents St Patrick s Day storm Substorm Wedgelets Westward electrojet Fusion Plasma and Space Physics plasma och rymdfysik Article in journal info:eu-repo/semantics/article text 2023 ftumeauniv https://doi.org/10.1051/swsc/2023018 2023-11-15T23:36:29Z During the long main phase of the St Patrick's Day storm on March 17, 2015, we found three separate enhancements of the westward electrojet. These enhancements are observed in the ionospheric equivalent currents computed using geomagnetic data over Fennoscandia. Using data from the IMAGE magnetometer network, we identified localised field-aligned current (FAC) systems superimposed on the pre-existing ionospheric current system. We suggest that these localised current systems are wedgelets and that they can potentially contribute to a larger-scale structure of a substorm current wedge (SCW). Each wedgelet is associated with a negative BX spike. Each spike is recorded at a higher latitude than the former one and all three are very localised over Fennoscandia. The first spike occurred at 17:34 UT and was observed at Lycksele, R rvik and Nurmij rvi, the second spike was recorded at 17:41 UT and located at Lycksele and R rvik, whereas the last spike occurred at 17:47 UT and was observed at Kevo and Abisko. Simultaneous optical auroral data and electron injections at the geosynchronous orbit indicate that one or more substorms took place in the polar ionosphere at the time of the wedgelets. This study demonstrates the occurrence of small and short-lived structures such as wedgelets at different locations over a short time scale, 15 min in this case. Article in Journal/Newspaper Abisko Fennoscandia Umeå University: Publications (DiVA) Abisko ENVELOPE(18.829,18.829,68.349,68.349) Kevo ENVELOPE(27.020,27.020,69.758,69.758) Journal of Space Weather and Space Climate 13 19 |
institution |
Open Polar |
collection |
Umeå University: Publications (DiVA) |
op_collection_id |
ftumeauniv |
language |
English |
topic |
Ionospheric equivalent currents St Patrick s Day storm Substorm Wedgelets Westward electrojet Fusion Plasma and Space Physics plasma och rymdfysik |
spellingShingle |
Ionospheric equivalent currents St Patrick s Day storm Substorm Wedgelets Westward electrojet Fusion Plasma and Space Physics plasma och rymdfysik Schillings, Audrey Palin, Laurianne Bower, Gemma E. Opgenoorth, Hermann J. Milan, Steve E. Kauristie, Kirsti Juusola, Liisa Reeves, Geoff D. Henderson, Mike G. Paxton, Larry J. Lester, Mark Hamrin, Maria Van De Kamp, Max Signatures of wedgelets over Fennoscandia during the St Patrick s Day Storm 2015 |
topic_facet |
Ionospheric equivalent currents St Patrick s Day storm Substorm Wedgelets Westward electrojet Fusion Plasma and Space Physics plasma och rymdfysik |
description |
During the long main phase of the St Patrick's Day storm on March 17, 2015, we found three separate enhancements of the westward electrojet. These enhancements are observed in the ionospheric equivalent currents computed using geomagnetic data over Fennoscandia. Using data from the IMAGE magnetometer network, we identified localised field-aligned current (FAC) systems superimposed on the pre-existing ionospheric current system. We suggest that these localised current systems are wedgelets and that they can potentially contribute to a larger-scale structure of a substorm current wedge (SCW). Each wedgelet is associated with a negative BX spike. Each spike is recorded at a higher latitude than the former one and all three are very localised over Fennoscandia. The first spike occurred at 17:34 UT and was observed at Lycksele, R rvik and Nurmij rvi, the second spike was recorded at 17:41 UT and located at Lycksele and R rvik, whereas the last spike occurred at 17:47 UT and was observed at Kevo and Abisko. Simultaneous optical auroral data and electron injections at the geosynchronous orbit indicate that one or more substorms took place in the polar ionosphere at the time of the wedgelets. This study demonstrates the occurrence of small and short-lived structures such as wedgelets at different locations over a short time scale, 15 min in this case. |
format |
Article in Journal/Newspaper |
author |
Schillings, Audrey Palin, Laurianne Bower, Gemma E. Opgenoorth, Hermann J. Milan, Steve E. Kauristie, Kirsti Juusola, Liisa Reeves, Geoff D. Henderson, Mike G. Paxton, Larry J. Lester, Mark Hamrin, Maria Van De Kamp, Max |
author_facet |
Schillings, Audrey Palin, Laurianne Bower, Gemma E. Opgenoorth, Hermann J. Milan, Steve E. Kauristie, Kirsti Juusola, Liisa Reeves, Geoff D. Henderson, Mike G. Paxton, Larry J. Lester, Mark Hamrin, Maria Van De Kamp, Max |
author_sort |
Schillings, Audrey |
title |
Signatures of wedgelets over Fennoscandia during the St Patrick s Day Storm 2015 |
title_short |
Signatures of wedgelets over Fennoscandia during the St Patrick s Day Storm 2015 |
title_full |
Signatures of wedgelets over Fennoscandia during the St Patrick s Day Storm 2015 |
title_fullStr |
Signatures of wedgelets over Fennoscandia during the St Patrick s Day Storm 2015 |
title_full_unstemmed |
Signatures of wedgelets over Fennoscandia during the St Patrick s Day Storm 2015 |
title_sort |
signatures of wedgelets over fennoscandia during the st patrick s day storm 2015 |
publisher |
Umeå universitet, Institutionen för fysik |
publishDate |
2023 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-212096 https://doi.org/10.1051/swsc/2023018 |
long_lat |
ENVELOPE(18.829,18.829,68.349,68.349) ENVELOPE(27.020,27.020,69.758,69.758) |
geographic |
Abisko Kevo |
geographic_facet |
Abisko Kevo |
genre |
Abisko Fennoscandia |
genre_facet |
Abisko Fennoscandia |
op_relation |
Journal of Space Weather and Space Climate, 2023, 13, orcid:0000-0001-6968-5405 orcid:0000-0001-7573-5165 orcid:0000-0002-2043-4442 http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-212096 doi:10.1051/swsc/2023018 ISI:001010354000001 Scopus 2-s2.0-85163322164 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1051/swsc/2023018 |
container_title |
Journal of Space Weather and Space Climate |
container_volume |
13 |
container_start_page |
19 |
_version_ |
1784899462720651264 |