A description of two possible mechanisms by which the earth's magnetic field might be excluded from a large region about a nuclear explosion. First, the Compton-recoil electrons generated by explosion gamma rays interact with the earth's magnetic field, producing a "back" field. Approximate calculations presented indicate that this mechanism does not exclude the field. The other possibility is that the field is excluded because of the blast-wave motion of heated (conducting) air. It is shown that this mechanism is effective and its magnitude is crudely estimated.
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