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The suns infrared output

Posted: Thu Dec 26, 2013 12:35 pm
by stephenprudence
I notice today that the sun feels much warmer than I can remember at this time of year. It genuinely does feel warm. Can the infrared output of the sun vary? Or is it constant? ( ie am I simply imagining the sun feels warmer than I previously remember ?

Re: The suns infrared output

Posted: Thu Dec 26, 2013 2:35 pm
by cordyman
Went on a 2 hour walk with the hoss this morning and was pretty warm in the sun. Not a patch on 2 week ago though when it was 12*c and sunny, as opposed to 1*c and sunny as it was today :lol:

So I think the overall daytime highs skewed my perception today!

Re: The suns infrared output

Posted: Thu Dec 26, 2013 3:00 pm
by Yorkshire Kris
Frost was still on the grass but the sun did feel warm. icon_sunny

Re: The suns infrared output

Posted: Thu Dec 26, 2013 5:24 pm
by fern Rob
I have been for a walk in Clumber Park today, one of the small lakes was completely iced over.

Re: The suns infrared output

Posted: Thu Dec 26, 2013 9:00 pm
by Conifers
stephenprudence wrote:I notice today that the sun feels much warmer than I can remember at this time of year. It genuinely does feel warm. Can the infrared output of the sun vary? Or is it constant? ( ie am I simply imagining the sun feels warmer than I previously remember ?
Doubt solar IR varies significantly. So much more depends on so many other factors, notably wind speed, but also thin high cloud, humidity, mental state of the observer, gumidity, alcohol consumption, ferrets, etc., etc., etc.

Re: The suns infrared output

Posted: Thu Dec 26, 2013 9:04 pm
by Dave Brown
I was inside the local hospice all day, as my mother in law is very near the end of her fight against cancer. The sun shone through the windows from about 8am, and the clarity of the atmosphere made it pleasantly warm, but when I came out briefly at lunchtime, looks were very deceptive, as it was freezing cold.

You can detect quite small changes in sunlight quality and strength, but mostly it is relative to the few days previously. For instance today it was still light (just) at 4pm where as it has been dark by 3:30pm for a few days.

Pic from hospice room this morning

Re: The suns infrared output

Posted: Thu Dec 26, 2013 10:18 pm
by Tom2006
Not here as only got to 4c!

Re: The suns infrared output

Posted: Fri Dec 27, 2013 9:06 am
by Dave Brown
Tom2006 wrote:Not here as only got to 4c!
only reached 4.6C here Tom

Re: The suns infrared output

Posted: Fri Dec 27, 2013 10:45 am
by Nigel
Stephen I was outside in a T-shirt at lunchtime yesterday, around mid-day the sun did indeed feel unusually warm , but i think thats because their was no wind and we have warm air over us.