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Questions tagged [uv-light]

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3 votes
1 answer
84 views

Can clouds increase the level of UV-A radiations received on the earth surface? If so, by how much, and in which condition(s)?

The American Scientist article nicely explains that clouds sometimes increase the level of UV radiations received on the earth surface. However, all the papers they cite focused on UV-B radiations. ...
Franck Dernoncourt's user avatar
6 votes
2 answers
3k views

Does the amount of UVA radiations one receives depend on the day ot the year?

The following quotes seem to be contradictory. From skincancer.org, the amount of UVA radiations during daylight hours stays constant throughout the year: UVA accounts for up to 95 percent of the UV ...
Franck Dernoncourt's user avatar
4 votes
1 answer
337 views

Does the amount of UVA radiations one receives depend on the latitude one is located, and if so, to what extent?

I wonder whether the amount of UVA radiations one receives depends on the latitude one is located, and if so, to what extent? I looked at UV indices of different cities, but those are useless since ...
Franck Dernoncourt's user avatar
8 votes
2 answers
1k views

To what extent do the levels of UVA, UVB and UVC radiations on the earth surface increase during solar flares?

To what extent do the levels of UVA, UVB and UVC radiations on the earth surface increase during solar flares?
Franck Dernoncourt's user avatar
2 votes
1 answer
210 views

Why is the level of UVA radiations on the earth surface the same throughout the day, while the level of UVB significantly varies?

I read on https://www.uexpress.com/ask-the-doctors/2018/1/17/no-matter-the-time-of-day UVA maintains the same intensity all day, which makes dawn-to-dusk sunscreen use important Whereas on ...
Franck Dernoncourt's user avatar
6 votes
2 answers
398 views

Can I just walk around Greenland with a UV light and find rare Earth minerals on the ground?

The NPR.org news article and podcast Greenland Is Not For Sale. But It Has The Rare Earth Minerals America Wants is interesting, and it includes a few large GIFs (too large to post here) that appear ...
uhoh's user avatar
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