Giant planet renders one side of its moon deadly, the 'shadow side' habitable. How?

My project concerns a world "A", that is a moon of a gas giant "Jovi", in a solar system with no other planets to speak of and a host star much like our own.

"A" is Earth-sized, has no magnetic field of its own, and keeps an atmosphere that is Earth-like in composition and density. It is tidally locked to "Jovi".

"Jovi" has few decided properties apart from being a gas giant roughly the size of our Jupiter.

Now, for "A" I would like its 'antijovian' hemisphere (the hemisphere facing away from "Jovi") to be habitable for humans, while its 'subjovian' hemisphere (the hemisphere facing toward "Jovi") to be uninhabitable, and far too deadly to even cross unprotected on foot - all because of some type of radiation or other effect emanating from planet "Jovi". Problem is, I can't think of the right set of circumstances that would produce this specific division. What comes closest to what I want is Jupiter's moon Io, that is bombarded with radiation from Jupiter's radiation belts on its trailing hemisphere, in contrast to very different 'wheather' on its leading hemisphere. But I want a division specifically subjovian/antijovian AND specifically deadly/habitable respectively.

Could someone please come up with any kind of scientifically plausible properties of this planetary system, particularly properties of the gas giant "Jovi", that would result in the type of division of moon "A" between habitable and unhabitable hemispheres as I described?

Cheers

PS: I thought leaving "A" without its own magnetic field, and instead have it rely on Jovi's magnetic field, would make it easier to think of a way to have part of it be prone to deadly radiation

posted over 4 years ago

N. Bleac‭

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