Why do you think the sun is blue in the STEREO spacecraft photo?

Question

See the picture of the "blue" sun here:

http://macrocosm-magbook.blogspot.com/

Answer 1

The blog describes the image as a "false-color image". This, to me, means that they have altered the color via computer. Most likely, the imagers on STEREO use visible light for some work, and other wavelengths for other work. Thus, since some images are created with wavelengths that are not visible to the eye, they then have to assign colors to them so we can view them.

Answer 2

I do believe that it is an single camera image of the sun using the xray portion of the spectrum. The color has been modified by nasa for easier viewing I believe. It would normaly be viewed as black and white. The different levels of blue might indicate the xray strenght. Thats what I think

Answer 3

Solar filter. Probably a mylar filter.

http://www.eclipse-chasers.com/safe.htm
There are two types of solar eclipse glasses on the market. One shows the sun in a blue color and the other provides a yellow-orange color. I recommend the yellow-orange style for most eclipse observers. The blue color filters appear silver in color while the yellow-orange color filters appear dark to the regular eye. The color produced by the filter is only visible when looking at the sun with the filters on.