Plane Making a Ripple Across the Sun

Mick West

Administrator
Staff member
cak_colormap.jpg
https://www.nasa.gov/feature/ground-based-schlieren-technique-looks-to-the-sun-and-moon
Patent here actually references what we are seeing in the OP:
http://patft.uspto.gov/netacgi/nph-...9,599,497.PN.&OS=PN/9,599,497&RS=PN/9,599,497
The idea in the patent is relatively simple:
  • Video the sun with a calcium-K optical filter to get a nice textured image.
  • Stabilize the video
  • Use some kind of change detection algorithm to detect changes between a reference image (a frame of the sun with no plane or shock wave) and each frame of the video.
You could probably do a very simple version of the latter by just subtracting the reference frame from the video frame. We could do this with the OP videos.
 

Mick West

Administrator
Staff member
We could do this with the OP videos.
Done!
Source: https://www.youtube.com/watch?v=sCWRGM4YvNo


Not a huge improvement though. The atmospheric distortion is rippling the image a lot, so you get a flickery ring around the sun.

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Methodology:
  • Stabilize motion in Adobe After Effects using the sunspot as a reference point
  • In Photoshop, subtract a still frame from the video
  • Add a levels adjustment to brighten everything up
20170818-082224-fhwr3.jpg
 
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