Peering though layers of the Sun

Using two STEREO instruments that view the Sun in extreme UV light, we can combine frames taken at about the same time and see features from both. The focus of interest here iss an active region coming around the edge of the Sun on February 23, 2008. We are comparing the emission which is most hot in 286 A and (mostly) relatively cool in 304 A so you can see their relative locations (one wavelength is represented by yellow in the movie, the other is represented by orange). Understanding why the sun is hot or cool in different locations is a big challenge in solar physics. This technique is a way to visualize how different solar features are revealed two of the four wavelengths of light taken by the EUVI instrument on STEREO.

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