THE CME HAS ARRIVED: Arriving almost exactly on time, a CME hit Earth's magnetic field on July 23rd at 0315 UT. The impact sparked a minor G1-class geomagnetic storm with auroras in some northern-tier US states.

There are eight sunspot groups on the solar disk. All of them have stable magnetic fields that pose little threat for strong solar flares. Credit: SDO/AIA

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