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Post by tommyFL on Feb 24, 2023 12:11:04 GMT -5
None of the UV data seen in any wikibox is real. They never take sunshine into account, they just use the latitude to find out the maximum possible UV index unde full sun and call it "average". Do you have an online source providing UV index and how to calculate it for a specific location? I know you've done a lot with sun hours/percentage at home. I've been curious as to how its done. Never really looked into it before, but my wife has had melanoma in the past and curious if its an easy quick calculation given sun angle, cloud percentage, elevation etc.
The EPA gives an example of how its done on their website but can't seem to figure out where they get their "strength" and "weight" values. Short answer: it can't be calculated without UV sensors that measure radiation at the right wavelength (100-400 nm). Typical solar radiation sensors/pyranometers only measure visible radiation, and I don't think UV radiation can be calculated from visible radiation since they're not exactly correlated. There may be a loose approximation, but I'm not familiar with one. |
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Post by Speagles84 on Feb 24, 2023 12:18:24 GMT -5
Do you have an online source providing UV index and how to calculate it for a specific location? I know you've done a lot with sun hours/percentage at home. I've been curious as to how its done. Never really looked into it before, but my wife has had melanoma in the past and curious if its an easy quick calculation given sun angle, cloud percentage, elevation etc.
The EPA gives an example of how its done on their website but can't seem to figure out where they get their "strength" and "weight" values. Short answer: it can't be calculated without UV sensors that measure radiation at the right wavelength (100-400 nm). Typical solar radiation sensors/pyranometers only measure visible radiation, and I don't think UV radiation can be calculated from visible radiation since they're not exactly correlated. There may be a loose approximation, but I'm not familiar with one. That was kind of my interpretation as well. I didn't really want to use a sensor as my property has so many trees, and in summer probably won't give an accurate reading. I guess I could put it in my garden, but its already pretty cluttered. Thanks anyway. |
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Post by Ethereal on Feb 25, 2023 1:56:08 GMT -5
E+ UV rays might make it feel warmer? Other than way too chilly and cloudy. UV rays don’t change the way you feel the temperature, infrared rays are what make it feel warmer. Also interesting how high the UV indexes are considering the cloudiness.Guessing when the sun hits the UV indexes will still be as they naturally were in that location. |
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Post by CRISPR on Feb 8, 2024 1:33:09 GMT -5
D+ for having not so warm, far too wet summers (even for me). Also, winter is rather cool, with average sunshine (despite lacking much rain)
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