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dc.contributor.authorYamauchi, M
dc.contributor.authorSergiengko, Timothy
dc.contributor.authorEnell, Carl-Fredrik
dc.contributor.authorSchillings, A.
dc.contributor.authorSlapak, R.
dc.contributor.authorJohnsen, Magnar Gullikstad
dc.contributor.authorTjulin, A.
dc.contributor.authorNilsson, H.
dc.date.accessioned2019-01-17T08:01:57Z
dc.date.available2019-01-17T08:01:57Z
dc.date.issued2018-09-03
dc.description.abstractWe 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.en_US
dc.description.sponsorshipSwedish National Space Agencyen_US
dc.descriptionSource at <a href=https://doi.org/10.1029/2018SW001937> https://doi.org/10.1029/2018SW001937</a>.en_US
dc.identifier.citationYamauchi, 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. <i>Space Weather: The international journal of research and applications</i>, 16(9), 1437-1450. https://doi.org/10.1029/2018SW001937en_US
dc.identifier.cristinIDFRIDAID 1610966
dc.identifier.doi10.1029/2018SW001937
dc.identifier.issn1542-7390
dc.identifier.urihttps://hdl.handle.net/10037/14466
dc.language.isoengen_US
dc.publisherAmerican Geophysical Union (AGU)en_US
dc.relation.journalSpace Weather: The international journal of research and applications
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Mathematics and natural science: 400::Physics: 430::Astrophysics, astronomy: 438en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Astrofysikk, astronomi: 438en_US
dc.subjectEISCATen_US
dc.subjectSeptember 2017 eventen_US
dc.subjectX flareen_US
dc.subjectICMEen_US
dc.subjection outflowen_US
dc.subjectSEPen_US
dc.titleIonospheric Response Observed by EISCAT During the 6–8 September 2017 Space Weather Event: Overviewen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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