Only the second flare texture shows up when you're there and apparently it disappears if you load up the save and Self Delete to teleport to the spot, so the save idea is out
All you have to do is use the mission editor to set your camera speed to the max, set the timescale to 2, and fly towards the sun flare holding down the left mouse button to speed up even more
It will take quite some time, maybe 10 minutes or more, i wasn't keeping count
Basically you can't control it's size, color, or position but you can change it's texture, and it fades out if you move outside the range in which it's visible, so it can't be seen from all directions
Also, it appears that it's behind whatever object is around it even if the object is behind the sun
