H-Alpha disk

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Dates	click on astromovie for the full size 15x decimated version!		See explanations here !
20150323			Full size decimated GIF is 5 MB
	This astromovie is decimated 15x (meaning only 1 frame out of 15 from original movie has been kept) ! To download - full size with all frames - astromovie, click here (XVID 45MB)

Parameters and Explanations

AVI / GIF	Except otherwise posted, all movies are captured at Saint Rémy lès Chevreuse, France	Related still images
20150323 11:58 to 16:10 UT	This 4h astromovie is the side result of a live broadcast of the Sun in Halpha. Refresh was done every minute. FireCapture was running in autorun mode, taking 5 s videos and waiting 55s for the next. As!2 in monitoring mode was registering videos as soon as they were appearing in the monitored folder. Registered PNGs were backed up while original videos were deleted. Not as people do usually Registax5 was used to register the video by luminosity CG (center of gravity) using a reference frame where the Sun had been filled with plain white*. Then the Halpha structures were not taken into account by the registration but only the circle. You can also see some live phenomenons happening during that time including a small flare and at left a small erupting prominence. Fluorite Perl Vixen 102/900 refractor on LXD75 mount, Coronado SM90/BF30, Meade F/3.3 CCD focal reducer, ASI174MM USB3 camera. * This reference image is at right. It was filled with the paint pot in Irfanview as best as possible using tolerance. A nicer way - we are taking care - would be to use a high quality corono effect filled with white (instead of the usual black) ... If interested by this development, download the ZIP CORONO beta. A nice software to use here for the registration in Object/Planetary mode - as I was suggested today in FireCapture Yahoo group - would have been Pipp v2.5 (Planetary Imaging PreProcessor ) from Chris Garry.
20050511 10:51 to 17:30 UT First Sun full-disk astromovie	On the  20050511 I made a first trial to do a color astromovie of the full-disk. This is not easy work as instead of using the webcam, I have to use the Canon 10D. Genarally I was using the optical part of the 2X Meade barlow but as it is difficult to have it optically aligned with the only one screw on the Coronado diagonal, I used this time a kenko teleplus 300 1.4x. Moreover, the wield is wider and vignetting is not present. The late shading visible on the AVI is only because it was taken until not long before sunset.   Otherwise as usual : Perl-Vixen Fluo 102/900 in // on LX200-12", Coronado SM/TM90. The TC-80N3 remote was set to take unattended one image every 2 min. then it was done from 10:51 to 17:30 UT. Thereafter, the Sun disappeared behind trees...On that astromovie I selected just a mall part with a little flare in the C range on the top left spot. I appreciated very much the help of Guy Buhry for writing a special script to enhance nicely the original (shown here resized from 3072*2048) pictures (0.3s at 400ISO) in which only the green and blue layers are used to convey the disk and prominence information. See also the active prominences on the lower right. Those interested can look at the long version where you can see : the Sun rotation, prominences appearing on the right limb and vanishing on the west one. There is also a BW version processed to mimic the aspect of professional observations as seen at ISOON : Low contrast moving ghost seen especially on the center of the images are thin dust particules on the CCD of the Canon10D. They are moving because the telescope is not perfectly aiming at the same direction on long periods (PE etc.). Sorry but it is very difficult to clean throufully the CCD and the cost of professionnal cleaning is not affordable on a regular basis ! No flat fields have been done but one could be constructed from original images on demand.	During the flare ...