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Active region
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In solar physics and observation, an active region is a temporary feature in the Sun's atmosphere characterized by a strong and complex magnetic field. They are often associated with sunspots and are commonly the source of violent eruptions such as coronal mass ejections and solar flares. The number and location of active regions on the solar disk at any given time is dependent on the solar cycle.
An active region seen in visible light showing a group of sunspots.
An active region seen in visible light showing a group of sunspots.
Sunspot
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Sunspots are temporary spots on the Sun's surface that are darker than the surrounding area. They are regions of reduced surface temperature caused by concentrations of magnetic flux that inhibit convection. Sunspots appear within active regions, usually in pairs of opposite magnetic polarity. Their number varies according to the approximately 11-year solar cycle.
The Swedish 1-m Solar Telescope at Roque de los Muchachos Observatory on La Palma in the Canary Islands
The Swedish 1-m Solar Telescope at Roque de los Muchachos Observatory on La Palma in the Canary Islands
Image: NASA's SDO Observes Largest Sunspot of the Solar Cycle (15430820129)
Image: NASA's SDO Observes Largest Sunspot of the Solar Cycle (15430820129)
Image: Sunspots 1302 Sep 2011 by NASA
Image: Sunspots 1302 Sep 2011 by NASA
Image: 172197main NASA Flare Gband lg withouttext
Image: 172197main NASA Flare Gband lg withouttext