coolhanduke Loc: Redondo Beach, CA

Were you using a solar filter, I hope?
What was your settings?
I used 1/1000 f/8
Got good orange pics.

profbowman Loc: Harrisonburg, VA, USA

Some of Thousand Oaks filter sheets are also Mylar or a similar plastic. The color will depend upon the transmission spectra for the material from which the filter is made.

Solar Radiation as it comes to Earth a sea level is nealy white. The attached graph shows various solar spectra.
The one we are interested in is the inner most one in the visible region. So, the orange color often seen of the solar disc is really artificial. --Richard

(Download)

petrochemist Loc: UK

The colour of sunlight reaching the earths surface depends on how much atmosphere the light has travelled through. It is distinctly redder when low in the sky as can be vouched for by just about anyone who has seen a sunset :)
I suspect the lower trace in your illustration is either noon or average daytime, at this point about 1/3 of the blue at the edge of the atmosphere is lost, while the red has only lost about 1/5. Towards sunset the light will pass through at least twice as much atmosphere, dropping the blue by another third, while the red only looses a fifth of the plotted intensity.

Of course the colour recorded by a camera will also depend on the white balance being used in processing, as potentially well as being affected by the lens & the camera body. there are many more variables than just the filter!