From our friend Jessie:
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BPEarthWatch
Published on Apr 1, 2016
Unusual Solar Geomagnetic Storm Warning.?
NOAA forecasters estimate a 60% chance of G2-class geomagnetic storms on April 2nd when a CIR is expected to hit Earth's magnetic field.
CIRs (co-rotating interaction regions) are transition zones between fast- and slow-moving solar wind streams.
Density gradients and shock waves inside CIRs often do a good job sparking auroras.