A co-rotating interaction region (CIR) could hit Earth’s magnetic field on Jan. 29th, according to NOAA forecasters. CIRs are transition zones between slow- and fast-moving streams of solar wind. They contain shock waves and compressed magnetic fields that often do a good job sparking auroras. Think of them as mini-CMEs. If this one arrives as predicted, Arctic sky watchers might witness an outburst of lights this weekend.

Ydun Ritz (2022-01-27)