Spatial structure of the modified Coulomb potential in a superstrong   magnetic field
  The modification of the Coulomb potential due to the enhancement of loop corrections in a superstrong magnetic field is studied numerically. We calculate the modified potential with high precision and obtain the pattern of equipotential lines. The results confirm the general features known from previous studies, however we emphasize some differences in potential structure that can be important for problems with spatially distributed charges. 
S.I. Glazyrin, S.I. Godunov
hep-ph nucl-th