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Unmanned Spaceflight.com _ Sun _ Cool Solar Images
Posted by: um3k Aug 21 2005, 12:11 AM
At the TRACE picture of the day website:
http://vestige.lmsal.com/TRACE/POD/TRACEpod.html
Posted by: deglr6328 Aug 21 2005, 01:09 AM
Neat. What are all those floaty bits wafting by from left to right? I've looked at trace movies before but never noticed them. Does the ccd have some kind of moving plastic roll going over it like those racing cams? And then....why?
Posted by: um3k Aug 22 2005, 06:05 PM
Which movie do you see them in? (link please)
Posted by: deglr6328 Aug 25 2005, 07:25 AM
http://vestige.lmsal.com/TRACE/POD/movies/125209main_quiet_640x480.mpg one. 
Posted by: Patteroast Aug 25 2005, 07:40 AM
It seems that the camera is moving, and the motion of the spots is from keeping the image of the sun stationary.
Awesome videos. I haven't seen much of the sun like this.
Posted by: Mongo Aug 25 2005, 01:15 PM
It looks to me that the sunspot is moving from left to right across the FoV of the imager -- due to the Sun's rotation -- and the 'spots' are dead pixels on the CCD, which appear to move right to left, but are actually stationary. The image that we see would be a cropped portion of the entire image, tracking with the sunspot.
Bill
Posted by: um3k Aug 25 2005, 02:06 PM
Like Mongo said, those are most likely dead pixels, or dust on the sensor. They are moving because the images that make up the movie have been cropped and repositioned in order to keep the sunspots centered.
Posted by: edstrick Aug 26 2005, 07:27 AM
You can see the right edge of the orignial image field-of-view come into the animation from the right, moving exactly in synchrony with the dots. They clearly are in the camera system which was not actively tracking <at least not precisely> the coronal loops over the sunspots.
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