As expected, a CME hit Earth's magnetic field on Jan. 24th at approximately 1500 UT (10 am EST). Geomagnetic storms are likely in the hours ahead. If it's dark where you live, go outside and look for auroras.

In Lofoton, Norway, the CME's arrival produced a surge in ground currents outside the laboratory of Rob Stammes:

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© Rob Stammes

"The expected CME arrived and showed up on my instruments at 15.10 UTC--a fantastic shockwave followed by a magnetic storm," says Stammes. "This could be a happy day for many aurora watchers."