The Zeldovich effect in a superstrong magnetic field

It follows from the analysis of the precision numerical calculations of the energy spectrum of a hydrogen atom in a static magnetic field that the Zeldovich effect (rearrangement of the atomic spectrum) in the spectrum of atomic levels is observed at superstrong magnetic fields $B\gtrsim 5\cdot 10^{11}$  G. Magnetic fields of such strengths are reached in neutron stars and magnetic white dwarfs. We established a lower bound $B_{\min}$ for the fields required for this effect to occur.