For clear-sky reference values you could look at https://www.openuv.io/
That site provides info dedicated for the location you ask:
info includes much more than UVI only.
For automatic extraction of info a script will be needed.
If you want automatic info on attenuation by clouds, then
https://www.ogimet.com/home.phtml.en is your friend:
look for it's octa-values for your location [=WMOID] through the url
"http://www.ogimet.com/cgi-bin/getsynop?block='..WMOID..'&begin='..UTC..'"
Or look for a weathersite in your area providing values for cloud-cover.
With that info [= 'clear-sky'+ 'octa'] you are able yourself to
calculate the expected practical UVI.
Op 8-2-2021 om 1:10 schreef [email protected]:
Hi!
I would like to know if these values are plausible for UV sensor here,
in Brazil.
I'm located in Ribeirao Preto, SP, Brazil (-21.1767, -47.8208) and the
sun is very 'hard' here. We are almost in tropical line and the sun
pass almost 90º degree above us at 12h00 pm......also, we are just in
the summer. So my question is: UV Index of 18~19 is a plausible value?
peak of 20.
I'm asking because i'm testing a new sensor in my station,
VEML6075....but I'm first trying it standalone using arduino and this
library ( https://github.com/adafruit/Adafruit_VEML6075 ). Acording to
this library,m the default values (calibration coefficient) are for
the sensor direct in the sunlight, without any protection. That's how
I tested today, sensor direct in the sunlight....but I'm thinking that
18~19 are too high, even with our 'brazilian sun'. It's very hot here,
about 38~40 in the shade.
If I use the sensor indoor at night (just using my LED home lights), I
got negative values in sensor (UVA and UVB, not index), but I think
that's right, since LEd doesn't emmite any UV light and sensor has
calibration values, right?
Here are the values that I got (just some samples). The lower value is
during the shade of a cloud, but still very bright.
3.jpg
1.jpg
2.jpg
4.jpg
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