CO-ROTATING INTERACTION REGION
NOAA forecasters estimate a 35% chance of
polar geomagnetic storms on May 14th when a co-rotating interaction region
(CIR) is expected to hit Earth's magnetic field. CIRs are transition zones
between fast and slow solar wind streams. Solar wind plasma piles up in these
regions, producing density gradients and shock waves that do a good job of
sparking auroras.
From SpaceWeather.com
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