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global seeing maps

  • michaeloconnell
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global seeing maps was created by michaeloconnell

I'm wondering if there are global maps for seeing.
Anyone know if such charts exist?
Michael.
10 years 4 months ago #94497

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Replied by cathalferris on topic Re: global seeing maps

I know of a good few sites that will give reasonable seeing predictions locally at a point, but to my knowledge there are no maps generated using this data that cover Europe.

I use Meteoblue and I've found it to be close enough though it is very much an alpha product for the seeing.

The Clear Sky Clock and the Canadian met service do astronomy seeing maps but North America only
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10 years 4 months ago #94499

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  • michaeloconnell
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Replied by michaeloconnell on topic Re: global seeing maps

Thanks Cathal.

I was thinking of some sort of map that contained annual average or monthly average seeing charts.
I've never seen them but i presume they must exist in some form or other.
10 years 4 months ago #94504

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Replied by eansbro on topic Re: global seeing maps

Michael,

I don't know of any world maps for seeing. The only maps I have come across are regional ones for most of the major observatory sites.
However, I understand there are meteorological air mass maps which may be the closest to providing seeing conditions in all different regions of the world.
The air mass terms used would have to be translated into seeing data.
Royal Meteorological Society and Meteorological Office at Bracknell would have these maps.

On a regional basis,in particular in the North West here, I have been using for some years an STV CCD camera that generates a graph for the seeing conditions as a function of the FWHM of star images as sampled every 2/10ths of a second. The seeing function uses a Differential Image Motion Monitor (DIMM) technique. This is similar to what the professional astronomers use at the major sites. I have a few thousand readings going back some years. I find it most useful for long durations of observing where its useful to monitor the "seeing" simulataneously as one is exposing CCD frames. It provides a measurement assessment of your limiting magnitude.

Eamonn

Eamonn
10 years 4 months ago #94506

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