This is a twitching lens flare, a compliment clip to the multi-element flare. Sometimes, for example, compositing over titles, you don't want a moving flare. You want a static one. A totally static image can be got via a freeze-frame - but that's the same. A little movement is good. Hence this clip.
You can download it in 1080p HD format from here:
I had to use h264 (but with the best quality it goes) to make it less than 200MB.
If you like this and want more then you can go to the whole archive of lens flares and light leaks here.
They are offered under creative commons. Read more here. If you are super kind and get something out of using these - or use them for commercial projects - then please donate a small amount and I can do some more -