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Aurora and Space Weather alert services...

DXrobot sends near real time VHF aurora alerts via email or to your mobile phone. The alerts are based on DX cluster reports.

Aurora Detection and Early Warning System sends email alerts when the Kp index eceeds your chosen limit.

AuroraWatch UK sends automated alerts from their magnetic activity monitor.

The Aurora Alarm alerts of visible aurora in two locations (northwest and midwest U.S.)

Aurora Alert Service from IPS (Australia). Also check their other alerts.

Sky & Telescope's AstroAlert service