if the sun's corona were a black-body radiator, what color would it be? (is it black-body?)
I couldn't find a number for the average temperature of the corona. let's assume 1 million kelvin. Wien's displacement law gives 2.9 nm peak wavelength: soft X-rays. (I don't understand why peak frequency is different from peak wavelength.) the conventional cutoff for extreme ultraviolet is 10 nm, but there's probably a long tail extending through EUV.
is it safe to use Planck's black-body radiation formula on extremely high temperatures? thermal gamma rays seem theoretically possible but seem suspicious; typically only nuclear processes can produce gamma rays.
what explains the color (of lack thereof) of the corona as seen during total solar eclipses?
No comments:
Post a Comment