Re: Sunlight
Re: Sunlight
- Subject: Re: Sunlight
- From: Roger Breton <email@hidden>
- Date: Sun, 18 Nov 2007 18:27:27 -0500
Hi David,
No, I did not point the spectro at the sun although, at one point, out of
suspicion, I did. The recommended procedure is to measure the illumination
'indirectly' by aiming it at some surface of know spectral reflectance.
Well, this idea that the amount of UV changes thoughout the season is
something new to me and worth investigating, as you noted, with NASA or
other public sources of sun's irradiance data on the internet.
Thank's so much for your kind help.
>
> I think that the depression of blue and UV may have to do with the seasonal
> variation due to the fact that the sunlight is reaching you through a greater
> angle, going through more atmosphere. There is typically much less UV in the
> Winter season and it probably takes some of the blue too. I'm pretty sure that
> NOAA or NASA would have such studies published.
>
> Did you point your Spectro directly at the sun? Would that be safe for the
> instrument?
>
> Regards,
>
> David
Roger Breton
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| | >Re: Sunlight (From: David Scharf <email@hidden>) |