Trailspotter
Senior Member.
While looking for examples of contrails on NASA Worldview, I encountered an unusual cloud pattern above Indian Ocean near the Australian coast in the EOSDIS satellite images taken on August 27, 2014:

The approximate coordinates of the pattern's centre point are 25° S, 107° E. The Terra image on the left was taken at 03:25 UTC, the Aqua image on the right was taken nearly three hours later, at 06:10 UTC. During this time interval the pattern moved 70 miles (100 km) South. It retained almost all old lines and acquired a few new ones. Zooming into the images show the pattern's fine structure - its south and north wings are made of parallel dotted lines, like if it were made with a giant dotted printer:
This pattern does not appear to be a natural formation. Giving its geographical location, I guess it could have resulted from some large scale operation related to the search for missing MH370, but I have not checked yet if there was such an activity in that area on that day.
Edit:
Here is a comparison of the Terra and Aqua images of the pattern made by larger streaks (ship trails?). The latter was scaled and rotated a bit to improve the match:
The approximate coordinates of the pattern's centre point are 25° S, 107° E. The Terra image on the left was taken at 03:25 UTC, the Aqua image on the right was taken nearly three hours later, at 06:10 UTC. During this time interval the pattern moved 70 miles (100 km) South. It retained almost all old lines and acquired a few new ones. Zooming into the images show the pattern's fine structure - its south and north wings are made of parallel dotted lines, like if it were made with a giant dotted printer:


This pattern does not appear to be a natural formation. Giving its geographical location, I guess it could have resulted from some large scale operation related to the search for missing MH370, but I have not checked yet if there was such an activity in that area on that day.
Edit:
Here is a comparison of the Terra and Aqua images of the pattern made by larger streaks (ship trails?). The latter was scaled and rotated a bit to improve the match:
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