RE: The suns corona is visible in the Voyager 1 photograph because it is above the ecliptic, where there is no "light pollution from "dust" that exists along the ecliptic

[johan-nygren]

it's an hypothesis, the context was that stars appear larger than they are, and some of that could be attributed to the stellar corona being more luminescent that people have assumed (measurements are relative, all our measurements of our solar system is within the ecliptic, except for that Voyager 1 image, and maybe some more)