  The cross section of dipole-magnetic photodisintegration of the negative
hydrogen ion has been calculated within the framework of an effective-range
theory. The dipole-magnetic cross section of photodetachment within the very
narrow range of energy near the process threshold dominates over the
dipole-electric one. It has been shown that in ultracold hydrogen plasma at
temperatures below kT=3.29.10-4 K the dipole-magnetic photo-recombination
becomes a main mechanism of electron capture by hydrogen atoms.
