Even old Warbirds 1.9 and 2.0 had nice sun effects where the sun could actually be used to an advantage. AH finaly, after 2 years actually got this "put a plane in the middle of the sun and have a bit more touble seeing him" weird sun blinding wannabee thing.
No need for fancy effects IMO, just something that blind up and light the screen up.
Try and look at the sun a nice day (always nice day in AH) and you'll notice ya can't look anywhere near it withouth having to close your eyes pretty much and there is no way in hell you can see somebody coming in from the sun in an attack (in air combat, don't ask me who'd come in from the sun to attack me on the ground).