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False-colour image of the sun showing sunspots
Coloured image of the Sun, taken in the red light emitted by hydrogen atoms, showing sunspots (dark red dots), active regions (yellow areas) and filaments (red lines). Sunspots are pockets of cool, dark gas which occur in magnetically active regions, often in groups. A filament is a jet of hot gas reaching into the Sun's corona. Filaments occurring near the Sun's limb (edge) appear bright and are called prominences. The grainy appearance (granulation) of the Sun's surface is caused by pockets of hot gas (convection cells) rising and falling in the photosphere. **This picture may not be used to state/imply NOAO endorsement of a commercial product or service. **
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