NASA satellite image strangeness

I’ve set up a continuously updating satellite image of the earth as my gnome wallpaper. Every 3 hours it uses wget to ftp the latest image from world sunlight map over at die.net/earth. On Monday evening I noticed a strange artefact in the image. I haven’t noticed corruption in the images before but for a while there appeared to be a rather large contrail over north Australia:

If it’s a contrail it’s really big and really fast, not to mention covering several thousand miles. It’s most likely some glitch in the camera, but it doesn’t look like a digital error in the file.

I don’t know what it is. If anybody else does let me know.