Quote:
Originally Posted by Shiraz
Hi Greg
re your question on how seeing varies, I did a couple of analyses on multi-night data from a couple of other targets (3 to 4 minute subs) - the attached data is HFR (in pixels as before) and shows how much and how quickly the seeing varies at this site. Hope it is interesting - it seems that short term fluctuations of around 0.2 pixels or more (or about 0.4 arcsec FWHM) are common, which is a fair bit really. Regards ray
edit: none of this data is normalised to remove the effect of elevation on seeing.
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Isn't this just the autoguiding log graphed? In which case it looks a lot like a PEC curve. So how do you extract the seeing from the PE?
I know Pempro has a calculation to do this. I am not sure what it would be other than its probably the outliers in otherwise repeating pattern.
Greg.