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Aurora Alert Tonight And Tuesday Sept. 10-11

10 Sep 2018, 15:21 UTC
Aurora Alert Tonight And Tuesday Sept. 10-11
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Tonight’s forecast looks good for northern lights. Watch the northern sky after dark for signs of greenish arcs and possibly rays. James Schaff
Cross your fingers. The space weather forecast looks promising with a moderate G2 geomagnetic storm expected to develop overnight. Northern lights could surge as far south as the the upper Midwest, New York, Idaho and Washington. The action is expected to begin early this evening with minor storming (G1) at nightfall blooming into a more extensive display between 10 p.m. and 1 a.m. Central Time.
Minor storms are forecast for Tuesday night too. In my experience G1 auroras are modest, appear low in the northern sky and need dark skies to really appreciate. G2s are brighter and livelier and can fill the northern sky. Our last good aurora occurred about two weeks ago at full moon — not exactly optimum conditions! Tonight, the moon is just past new, making this about as optimum as you can get.
A huge coronal hole photographed by the Solar Dynamics Observatory in extreme ultraviolet light on Tuesday this week. The loopy magnetic field that normally holds back a fast solar wind is drawn in as the white squiggles. NASA/SDO
Solar ...

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