The choices are probably just "sunny" colors, but there are three wavelengths present in this particular picture and I'm relatively certain each color represents one wavelength.
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Here is a caption I found regarding this picture: "A burst of solar material leaps off the left side of the sun in what's known as a prominence eruption. This image combines three images from NASA's Solar Dynamics Observatory captured on May 3, 2013, at 1:45 pm EDT, just as an M-class solar flare from the same region was subsiding. The images include light from the 131-, 171- and 304-angstrom wavelengths.
Credit: NASA/SDO/AIA"
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The website is https://svs.gsfc.nasa.gov/11262
Does anyone know how they choose the way the colour these images?
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Here is a caption I found regarding this picture: "A burst of solar material leaps off the left side of the sun in what's known as a prominence eruption. This image combines three images from NASA's Solar Dynamics Observatory captured on May 3, 2013, at 1:45 pm EDT, just as an M-class solar flare from the same region was subsiding. The images include light from the 131-, 171- and 304-angstrom wavelengths.
Credit: NASA/SDO/AIA"
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The website is https://svs.gsfc.nasa.gov/11262
Thank you so much, Jace!
Just thought I'd mention that.