The Sun
Real-time images of the Sun from NASA's SDO observatory, sunrise and sunset times, twilight for your location and current geomagnetic activity.
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The Sun now
What you are looking at
NASA's Solar Dynamics Observatory (SDO) images the Sun at different wavelengths: each channel reveals its own layer of the atmosphere — from the chromosphere to the corona, flares and coronal holes. The Kp index tracks Earth's geomagnetic activity: at Kp ≥ 5 magnetic storms begin and auroras reach mid-latitudes.
The AstroTools app keeps solar activity and the aurora forecast in your pocket — with Kp spike notifications, astro weather and the night score.
Plan your observing with AstroTools
Weather, the Moon, light pollution and satellite passes — in one app.