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Cool Solar Images, and videos
um3k
post Aug 21 2005, 12:11 AM
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At the TRACE picture of the day website:
http://vestige.lmsal.com/TRACE/POD/TRACEpod.html
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deglr6328
post Aug 21 2005, 01:09 AM
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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?
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um3k
post Aug 22 2005, 06:05 PM
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QUOTE (deglr6328 @ Aug 20 2005, 09:09 PM)
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?
*

Which movie do you see them in? (link please)
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deglr6328
post Aug 25 2005, 07:25 AM
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This one. huh.gif
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Patteroast
post Aug 25 2005, 07:40 AM
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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.
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Mongo
post Aug 25 2005, 01:15 PM
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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
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um3k
post Aug 25 2005, 02:06 PM
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QUOTE (deglr6328 @ Aug 25 2005, 03:25 AM)
This one.  huh.gif
*

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.
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edstrick
post Aug 26 2005, 07:27 AM
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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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