X-rays from the Sun

Sunspots are cooler than the surrounding solar surface because the magnetic fields that create them reduce convective heating from the Sun’s interior. However, sometimes regions in the corona above sunspots can be hundreds of times hotter. The Nuclear Spectroscopic Telescope Array (NuSTAR) satellite is being used to investigate this phenomenon. This false color image shows the Sun in ultraviolet light (red ) as seen by the orbiting Solar Dynamics Observatory . X-ray imagery (green and blue) detected by NuSTAR has been superimposed, highlighting regions of extremely high temperature.

Image Credit: NASA

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