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- W2893130379 abstract "Abstract 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 10 13 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." @default.
- W2893130379 created "2018-10-05" @default.
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- W2893130379 date "2018-09-01" @default.
- W2893130379 modified "2023-10-14" @default.
- W2893130379 title "O<sup>+</sup> Escape During the Extreme Space Weather Event of 4–10 September 2017" @default.
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- W2893130379 doi "https://doi.org/10.1029/2018sw001881" @default.
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