Further, what about the spacecraft that either directly study the sun or get electricity through solar PV panels? If anything, they get somewhat greater solar flux (no atmospheric effects).

__________________
I say there is an invisible elf in my backyard. How do you prove that I am wrong?

Disclaimer: Avatar is not an official NASA image and does not imply any specific interplanetary or interstellar capability.

The Leif Ericson Cruiser