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It could just be a fly on the lens cap of the satellite.
Cosmic rays are very high energy particles which come from a variety of sources (e.g. solar flares, supernovae). They are of interest to lots of astronomers, but mostly just noise for us. We see lots of them in every image and occasionally, 3 or 4 of them hit the CCD in just the right places in consecutive images to fool us into believing there is a real object there. The cosmic rays can show up as points or as streaks. (helios.gsfc.nasa.gov...). Click on the image below to see typical examples of cosmic rays visible in LASCO images.