[ASA Vet]

I read it in the 60's, don't know if it's still around.
The premise was that moving though the Earths magnetic field
effected the neutron flow thus inhibiting fission.
In the book a fission device could work only when stationary as in the "Trinity" test.
It claimed the two Japanese attacks were really not nukes.

[RadioAstronomer]

I will take a look in the used book stores. Thanks. :-)