Nothing ever impacts the rate of radioactive decay. That's basic school physics.
This isn't radioactive products of the explosion itself (that is, gamma quants and beta particles produced by decay of fission products). They probably had no impact at all on any of the satellites (prompt radiation - neutrons produced in fission reaction itself - of course could and probably had some impact - but it lasts milliseconds to seconds).
What they are speaking is impact on Earth natural radiation belts with the electrons produced in the explosion. Electrons of course, do not decay at all. After that it was due to natural processes in the Earth's magnetic field to return things back to normal. This is a geophysical process that has nothing to do with the radioactive decay of any of the fission products produced.
This isn't radioactive products of the explosion itself (that is, gamma quants and beta particles produced by decay of fission products). They probably had no impact at all on any of the satellites (prompt radiation - neutrons produced in fission reaction itself - of course could and probably had some impact - but it lasts milliseconds to seconds).
What they are speaking is impact on Earth natural radiation belts with the electrons produced in the explosion. Electrons of course, do not decay at all. After that it was due to natural processes in the Earth's magnetic field to return things back to normal. This is a geophysical process that has nothing to do with the radioactive decay of any of the fission products produced.