AuroraWatch
Aurora alert
Aurora alert: CMEs from sunspot 4549 could bring G1–G2 storms on 11 and 12 October
A busy week on the Sun has sent several coronal mass ejections towards Earth. NOAA expects minor (G1) storming through 11 October and moderate (G2) storming early on 12 October UTC, with a new moon keeping skies dark.
News, with video
What causes the Aurora?
The aurora starts at the Sun. This short video follows the solar wind 150 million km to Earth, through our magnetic field and down to the gases that glow green, red and purple over both poles.
App update
AuroraWatch 3.6: private AI summaries, Siri and an Apple Watch app
Version 3.6 of AuroraWatch: Aurora Alerts is built for iOS 27. AI summaries can now be written privately on your iPhone, Siri answers aurora questions out loud, and Pro adds a live Apple Watch dashboard.
Guide
Bz and solar wind: what actually triggers the aurora
Kp tells you what already happened. Bz and solar wind speed tell you what is about to. How to read live solar wind data and catch aurora before Kp catches up.
Guide
How to photograph the aurora, on a phone or a camera
iPhone and camera settings for the Northern Lights and Aurora Australis, Night Mode tips, and the mistakes that ruin most first attempts.
Guide
What Kp index do you need to see the aurora?
What Kp you need for the Northern Lights and Aurora Australis, how latitude and Bz affect visibility, and how to use NOAA forecasts before you head out.
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