maybe check out "lense flair", I guess there's something in the code archives. Additionally you can use a linepick to determine if you have to hide/unhide the suns corona, depending on its visibility.
Here comes the sun
it's allright
Da - dadada dadada dadada da da da da :°)
Here comes the sun
it's allright
Da - dadada dadada dadada da da da da :°)