Incidence of Alfvenic SC pulse onto the conjugate ionospheres
A circuit analogy for magnetosphere - ionosphere current systems has two extremes: the voltage generator (when the ground magnetic response is proportional to the ionospheric conductance) and the current generator (when the ground magnetic response practically does not depend on the ionospheric cond...
Published in: | Journal of Geophysical Research: Space Physics |
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2020
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ftdtupubl:oai:pure.atira.dk:publications/ca2e8990-b3ba-42c2-ae1e-144b0657b3d7 2023-05-15T13:49:25+02:00 Incidence of Alfvenic SC pulse onto the conjugate ionospheres Pilipenko, Vyacheslav A. Fedorov, Evgeniy N. Xu, Zhonghua Hartinger, Michael D. Engebretson, Mark J. Edwards, Thom R. 2020 application/pdf https://orbit.dtu.dk/en/publications/ca2e8990-b3ba-42c2-ae1e-144b0657b3d7 https://doi.org/10.1029/2019ja027397 https://backend.orbit.dtu.dk/ws/files/210404931/2019JA027397.pdf eng eng info:eu-repo/semantics/openAccess Pilipenko , V A , Fedorov , E N , Xu , Z , Hartinger , M D , Engebretson , M J & Edwards , T R 2020 , ' Incidence of Alfvenic SC pulse onto the conjugate ionospheres ' , Journal of Geophysical Research: Space Physics , vol. 125 , no. 2 , e2019JA027397 . https://doi.org/10.1029/2019ja027397 article 2020 ftdtupubl https://doi.org/10.1029/2019ja027397 2022-08-14T08:36:34Z A circuit analogy for magnetosphere - ionosphere current systems has two extremes: the voltage generator (when the ground magnetic response is proportional to the ionospheric conductance) and the current generator (when the ground magnetic response practically does not depend on the ionospheric conductance). Non-steady field-aligned currents interact with the ionosphere in a different way depending on the ratio between the driver time scale τ and the Alfven field line eigenperiod T A . Sudden Commencement (SC) impulses at high latitudes correspond to the situation when τ << T A . This case of Alfven pulses propagating independently away from the equatorial plane is analytically examined with the magnetospheric plasma box model with thin asymmetric conjugate ionospheres. At high latitudes the amplitude ratio in conjugate ionospheres in general does not correspond directly to either the current or voltage regimes. Theoretical predictions are supported by examples of typical SC event observations at conjugate magnetometer sites in Greenland and Antarctica during summer and winter periods. Article in Journal/Newspaper Antarc* Antarctica Greenland Technical University of Denmark: DTU Orbit Greenland Journal of Geophysical Research: Space Physics 125 2 |
institution |
Open Polar |
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Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
description |
A circuit analogy for magnetosphere - ionosphere current systems has two extremes: the voltage generator (when the ground magnetic response is proportional to the ionospheric conductance) and the current generator (when the ground magnetic response practically does not depend on the ionospheric conductance). Non-steady field-aligned currents interact with the ionosphere in a different way depending on the ratio between the driver time scale τ and the Alfven field line eigenperiod T A . Sudden Commencement (SC) impulses at high latitudes correspond to the situation when τ << T A . This case of Alfven pulses propagating independently away from the equatorial plane is analytically examined with the magnetospheric plasma box model with thin asymmetric conjugate ionospheres. At high latitudes the amplitude ratio in conjugate ionospheres in general does not correspond directly to either the current or voltage regimes. Theoretical predictions are supported by examples of typical SC event observations at conjugate magnetometer sites in Greenland and Antarctica during summer and winter periods. |
format |
Article in Journal/Newspaper |
author |
Pilipenko, Vyacheslav A. Fedorov, Evgeniy N. Xu, Zhonghua Hartinger, Michael D. Engebretson, Mark J. Edwards, Thom R. |
spellingShingle |
Pilipenko, Vyacheslav A. Fedorov, Evgeniy N. Xu, Zhonghua Hartinger, Michael D. Engebretson, Mark J. Edwards, Thom R. Incidence of Alfvenic SC pulse onto the conjugate ionospheres |
author_facet |
Pilipenko, Vyacheslav A. Fedorov, Evgeniy N. Xu, Zhonghua Hartinger, Michael D. Engebretson, Mark J. Edwards, Thom R. |
author_sort |
Pilipenko, Vyacheslav A. |
title |
Incidence of Alfvenic SC pulse onto the conjugate ionospheres |
title_short |
Incidence of Alfvenic SC pulse onto the conjugate ionospheres |
title_full |
Incidence of Alfvenic SC pulse onto the conjugate ionospheres |
title_fullStr |
Incidence of Alfvenic SC pulse onto the conjugate ionospheres |
title_full_unstemmed |
Incidence of Alfvenic SC pulse onto the conjugate ionospheres |
title_sort |
incidence of alfvenic sc pulse onto the conjugate ionospheres |
publishDate |
2020 |
url |
https://orbit.dtu.dk/en/publications/ca2e8990-b3ba-42c2-ae1e-144b0657b3d7 https://doi.org/10.1029/2019ja027397 https://backend.orbit.dtu.dk/ws/files/210404931/2019JA027397.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Antarc* Antarctica Greenland |
genre_facet |
Antarc* Antarctica Greenland |
op_source |
Pilipenko , V A , Fedorov , E N , Xu , Z , Hartinger , M D , Engebretson , M J & Edwards , T R 2020 , ' Incidence of Alfvenic SC pulse onto the conjugate ionospheres ' , Journal of Geophysical Research: Space Physics , vol. 125 , no. 2 , e2019JA027397 . https://doi.org/10.1029/2019ja027397 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2019ja027397 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
125 |
container_issue |
2 |
_version_ |
1766251320516280320 |