UNEXPECTED SOLAR WIND GUST: A gust of solar wind buffeted Earth's magnetic field on Sept. 7th around 1400 UT. The sharp uptick in solar wind speed was unexpected, arriving too soon to be a CME from the B7-class solar flare only two days earlier. Whatever it was, the transient has set the stage for high-latitude auroras on the night of Sept. 7-8.

https://imgur.com/s9DSys4

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