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O+ Escape During th...
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Schillings, AudreyLuleå tekniska universitet,Rymdteknik,Swedish Institute of Space Physics, Kiruna, Sweden
(author)
O+ Escape During the Extreme Space Weather Event of 4–10 September 2017
- Article/chapterEnglish2018
Publisher, publication year, extent ...
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Blackwell Publishing,2018
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LIBRIS-ID:oai:DiVA.org:ltu-71026
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https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-71026URI
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https://doi.org/10.1029/2018SW001881DOI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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Validerad;2018;Nivå 2;2018-10-17 (johcin)
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We have investigated the consequences of extreme space weather on ion outflow from the polar ionosphere by analyzing the solar storm that occurred early September 2017, causing a severe geomagnetic storm. Several X-flares and coronal mass ejections were observed between 4 and 10 September. The first shock—likely associated with a coronal mass ejection—hit the Earth late on 6 September, produced a storm sudden commencement, and began the initial phase of the storm. It was followed by a second shock, approximately 24 hr later, that initiated the main phase and simultaneously the Dst index dropped to Dst = −142 nT and Kp index reached Kp = 8. Using COmposition DIstribution Function data on board Cluster satellite 4, we estimated the ionospheric O+ outflow before and after the second shock. We found an enhancement in the polar cap by a factor of 3 for an unusually high ionospheric O+ outflow (mapped to an ionospheric reference altitude) of 1013 m−2 s−1. We suggest that this high ionospheric O+ outflow is due to a preheating of the ionosphere by the multiple X-flares. Finally, we briefly discuss the space weather consequences on the magnetosphere as a whole and the enhanced O+ outflow in connection with enhanced satellite drag.
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Nilsson, HansLuleå tekniska universitet,Rymdteknik,Swedish Institute of Space Physics, Kiruna, Sweden(Swepub:ltu)hannil
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Slapak, R.EISCAT Scientific Association, Kiruna, Sweden
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Wintoft, P.Swedish Institute of Space Physics, Lund, Sweden
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Yamauchi, M.Swedish Institute of Space Physics, Kiruna, Sweden
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Wik, M.Swedish Institute of Space Physics, Lund, Sweden
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Dandouras, I.IRAP, Université de Toulouse, CNRS, UPS, CNES, France
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Carr, C.M.Department of Physics, Imperial College London, London, United Kingdom
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Luleå tekniska universitetRymdteknik
(creator_code:org_t)
Related titles
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In:Space Weather: Blackwell Publishing16:9, s. 1363-13761542-7390
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