Ionospheric Response Observed by EISCAT During the 6–8 September 2017 Space Weather Event: Overview
Source at https://doi.org/10.1029/2018SW001937 . We present ionospheric plasma conditions observed by the EISCAT radars in Tromsø and on Svalbard, covering 68°–81° geomagnetic latitude, during 6–8 September 2017. This is a period when X2.2 and X9.3 X‐ray flares occurred, two interplanetary coronal m...
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American Geophysical Union (AGU)
2018
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Online Access: | https://hdl.handle.net/10037/14466 https://doi.org/10.1029/2018SW001937 |
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ftunivtroemsoe:oai:munin.uit.no:10037/14466 2023-05-15T16:04:32+02:00 Ionospheric Response Observed by EISCAT During the 6–8 September 2017 Space Weather Event: Overview Yamauchi, M Sergiengko, Timothy Enell, Carl-Fredrik Schillings, A. Slapak, R. Johnsen, Magnar Gullikstad Tjulin, A. Nilsson, H. 2018-09-03 https://hdl.handle.net/10037/14466 https://doi.org/10.1029/2018SW001937 eng eng American Geophysical Union (AGU) Space Weather: The international journal of research and applications Yamauchi, M., Sergiengko, T., Enell, C.-F., Schillings, A., Slapak, R., Johnsen, M.G., . Nilsson, H. (2018). Ionospheric response observed by EISCAT during the September 6‐8, 2017, space weather event: overview. Space Weather: The international journal of research and applications , 16(9), 1437-1450. https://doi.org/10.1029/2018SW001937 FRIDAID 1610966 doi:10.1029/2018SW001937 1542-7390 https://hdl.handle.net/10037/14466 openAccess VDP::Mathematics and natural science: 400::Physics: 430::Astrophysics astronomy: 438 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Astrofysikk astronomi: 438 EISCAT September 2017 event X flare ICME ion outflow SEP Journal article Tidsskriftartikkel Peer reviewed 2018 ftunivtroemsoe https://doi.org/10.1029/2018SW001937 2021-06-25T17:56:16Z Source at https://doi.org/10.1029/2018SW001937 . We present ionospheric plasma conditions observed by the EISCAT radars in Tromsø and on Svalbard, covering 68°–81° geomagnetic latitude, during 6–8 September 2017. This is a period when X2.2 and X9.3 X‐ray flares occurred, two interplanetary coronal mass ejections (ICMEs) arrived at the Earth accompanied by enhancements of MeV‐range energetic particle flux in both the solar wind (SEP event) and inner magnetosphere, and an AL < −2,000 substorm took place. (1) Both X flares caused enhancement of ionospheric electron density for about 10 min. The X9.3 flare also increased temperatures of both electrons and ions over 69°–75° geomagnetic latitude until the X‐ray flux decreased below the level of X‐class flares. However, the temperature was not enhanced after the previous X2.2 flare in the prenoon sector. (2) At around 75° geomagnetic latitude, the prenoon ion upflow flux slightly increased the day after the X9.3 flare, which is also after the first ICME and a SEP event, while no outstanding enhancement was found at the time of these X flares. (3) The upflow velocity sometimes decreased when the interplanetary magnetic field (IMF) turned southward. (4) Before the first ICME arrival after the SEP event under weak IMF with Bz ~0 nT, a substorm‐like expansion of the auroral arc signature took place without local geomagnetic signature near local midnight, while no notable change was observed after the ICME arrival. (5) AL reached <−2,000 nT only after the arrival of the second ICME with strongly southward IMF. Causality connections between the solar/solar wind event and the ionospheric responses remain unclear. Article in Journal/Newspaper EISCAT Svalbard Tromsø University of Tromsø: Munin Open Research Archive Svalbard Tromsø Space Weather 16 9 1437 1450 |
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Open Polar |
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University of Tromsø: Munin Open Research Archive |
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ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Physics: 430::Astrophysics astronomy: 438 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Astrofysikk astronomi: 438 EISCAT September 2017 event X flare ICME ion outflow SEP |
spellingShingle |
VDP::Mathematics and natural science: 400::Physics: 430::Astrophysics astronomy: 438 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Astrofysikk astronomi: 438 EISCAT September 2017 event X flare ICME ion outflow SEP Yamauchi, M Sergiengko, Timothy Enell, Carl-Fredrik Schillings, A. Slapak, R. Johnsen, Magnar Gullikstad Tjulin, A. Nilsson, H. Ionospheric Response Observed by EISCAT During the 6–8 September 2017 Space Weather Event: Overview |
topic_facet |
VDP::Mathematics and natural science: 400::Physics: 430::Astrophysics astronomy: 438 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Astrofysikk astronomi: 438 EISCAT September 2017 event X flare ICME ion outflow SEP |
description |
Source at https://doi.org/10.1029/2018SW001937 . We present ionospheric plasma conditions observed by the EISCAT radars in Tromsø and on Svalbard, covering 68°–81° geomagnetic latitude, during 6–8 September 2017. This is a period when X2.2 and X9.3 X‐ray flares occurred, two interplanetary coronal mass ejections (ICMEs) arrived at the Earth accompanied by enhancements of MeV‐range energetic particle flux in both the solar wind (SEP event) and inner magnetosphere, and an AL < −2,000 substorm took place. (1) Both X flares caused enhancement of ionospheric electron density for about 10 min. The X9.3 flare also increased temperatures of both electrons and ions over 69°–75° geomagnetic latitude until the X‐ray flux decreased below the level of X‐class flares. However, the temperature was not enhanced after the previous X2.2 flare in the prenoon sector. (2) At around 75° geomagnetic latitude, the prenoon ion upflow flux slightly increased the day after the X9.3 flare, which is also after the first ICME and a SEP event, while no outstanding enhancement was found at the time of these X flares. (3) The upflow velocity sometimes decreased when the interplanetary magnetic field (IMF) turned southward. (4) Before the first ICME arrival after the SEP event under weak IMF with Bz ~0 nT, a substorm‐like expansion of the auroral arc signature took place without local geomagnetic signature near local midnight, while no notable change was observed after the ICME arrival. (5) AL reached <−2,000 nT only after the arrival of the second ICME with strongly southward IMF. Causality connections between the solar/solar wind event and the ionospheric responses remain unclear. |
format |
Article in Journal/Newspaper |
author |
Yamauchi, M Sergiengko, Timothy Enell, Carl-Fredrik Schillings, A. Slapak, R. Johnsen, Magnar Gullikstad Tjulin, A. Nilsson, H. |
author_facet |
Yamauchi, M Sergiengko, Timothy Enell, Carl-Fredrik Schillings, A. Slapak, R. Johnsen, Magnar Gullikstad Tjulin, A. Nilsson, H. |
author_sort |
Yamauchi, M |
title |
Ionospheric Response Observed by EISCAT During the 6–8 September 2017 Space Weather Event: Overview |
title_short |
Ionospheric Response Observed by EISCAT During the 6–8 September 2017 Space Weather Event: Overview |
title_full |
Ionospheric Response Observed by EISCAT During the 6–8 September 2017 Space Weather Event: Overview |
title_fullStr |
Ionospheric Response Observed by EISCAT During the 6–8 September 2017 Space Weather Event: Overview |
title_full_unstemmed |
Ionospheric Response Observed by EISCAT During the 6–8 September 2017 Space Weather Event: Overview |
title_sort |
ionospheric response observed by eiscat during the 6–8 september 2017 space weather event: overview |
publisher |
American Geophysical Union (AGU) |
publishDate |
2018 |
url |
https://hdl.handle.net/10037/14466 https://doi.org/10.1029/2018SW001937 |
geographic |
Svalbard Tromsø |
geographic_facet |
Svalbard Tromsø |
genre |
EISCAT Svalbard Tromsø |
genre_facet |
EISCAT Svalbard Tromsø |
op_relation |
Space Weather: The international journal of research and applications Yamauchi, M., Sergiengko, T., Enell, C.-F., Schillings, A., Slapak, R., Johnsen, M.G., . Nilsson, H. (2018). Ionospheric response observed by EISCAT during the September 6‐8, 2017, space weather event: overview. Space Weather: The international journal of research and applications , 16(9), 1437-1450. https://doi.org/10.1029/2018SW001937 FRIDAID 1610966 doi:10.1029/2018SW001937 1542-7390 https://hdl.handle.net/10037/14466 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1029/2018SW001937 |
container_title |
Space Weather |
container_volume |
16 |
container_issue |
9 |
container_start_page |
1437 |
op_container_end_page |
1450 |
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1766400130803564544 |