Re: flaring geo sat video on spaceweather

From: Rainer Kresken (
Date: Fri Apr 15 2011 - 10:59:50 UTC

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    Dear list,
    On 4/15/2011 11:46 AM, Greg Roberts wrote:
    > Morning Bob
    > In an email message just received Rainer Kresken solved the "puzzle" - the
    > camera was tracking the approximate azimuth of the antisolar point - I wasnt
    > aware of this, so all is clear now .
    > Very nice picture.
    I didnt mean to withold my posting from the list, I just clicked the wrong button!
    On 4/15/2011 10:05 AM, Greg Roberts wrote:
     > But what puzzles me is why what appears to be fixed horizon objects are
     > moving - a geo ,for most practical purposes is at a fixed az/el, neglecting
     > the objects inclination at this image scale so I would expect the horizon to
     > be static and some small variation in the geosats image,but instead there is
     > considerable horizon movement.
    the camera tracks approximately the azimuth of the antisolar point. This way, 
    the flares occur close to the horizontal center of the movie frames. If you pick 
    any flaring sat, you see that it doesn't move with respect to the horizon, just 
    as a good geosat is supposed to do.
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