This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Of, pertaining to, or happening within the magnetosphere

"And if they're talking about rem, this is presumably a measure of gamma radiation probably a secondary product from magnetospheric charged-particle bombardment of Jupiter's outer atmosphere, or Io's own feeble salt-and-sulfur atmosphere, and would indeed at the doses you've uncovered require significant shielding."

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