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However, the transient (&lt;\u223c1\u00a0min) response of the ionosphere\u2010thermosphere system during an SC has been little studied due to limited temporal resolution in previous investigations. Here, we report observations of a global reversal of ionospheric vertical plasma motion during an SC on 24 October 2011 using \u223c6\u00a0s resolution Super Dual Auroral Radar Network ground scatter data. The dayside ionosphere suddenly moved downward during the magnetospheric compression due to the SC, lasting for only \u223c1\u00a0min before moving upward. By contrast, the post\u2010midnight ionosphere briefly moved upward then moved downward during the SC. Simulations with a coupled geospace model suggest that the reversed\n                    <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/grl64887-math-0001.png\" xlink:title=\"urn:x-wiley:00948276:media:grl64887:grl64887-math-0001\"\/>\n                    vertical drift is caused by a global reversal of ionospheric zonal electric field induced by magnetospheric compression during the SC.\n                  <\/jats:p>","DOI":"10.1029\/2022gl100014","type":"journal-article","created":{"date-parts":[[2022,9,22]],"date-time":"2022-09-22T01:57:33Z","timestamp":1663811853000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Geospace Concussion: Global Reversal of Ionospheric Vertical Plasma Drift in Response to a Sudden Commencement"],"prefix":"10.1029","volume":"49","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8425-8241","authenticated-orcid":false,"given":"Xueling","family":"Shi","sequence":"first","affiliation":[{"name":"Department of Electrical and Computer Engineering Virginia Tech  Blacksburg VA USA"},{"name":"High Altitude Observatory National Center for Atmospheric Research  Boulder CO USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2894-6677","authenticated-orcid":false,"given":"Dong","family":"Lin","sequence":"additional","affiliation":[{"name":"High Altitude Observatory National Center for Atmospheric Research  Boulder CO USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6287-4542","authenticated-orcid":false,"given":"Wenbin","family":"Wang","sequence":"additional","affiliation":[{"name":"High Altitude Observatory National Center for Atmospheric Research  Boulder CO USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6255-3039","authenticated-orcid":false,"given":"Joseph B. 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