What thickness of atmosphere and strength of magnetosphere would I need for a planet to have a deadly daytime and a hospitable nighttime?

What thickness of atmosphere, and strength of magnetosphere, would I need for a planet to have a deadly daytime and a hospitable nighttime?

I'm wanting a planet in which humans can survive on as long as they come outside at night. The Sun's UV light is lethal, and so no human can come out during the day; but the night is non-lethal.

The Sun in question is a main sequence G-type star, about 4.6/4.7 billion years old; and the orbit is close enough to an AU to say, essentially, an identical orbit to Earth. Not the actual solar system, but very similar.

What would have to happen to magentosphere, ozone layer, air density and composition, etc?

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What thickness of atmosphere and strength of magnetosphere would I need for a planet to have a deadly daytime and a hospitable nighttime?

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