Аннотация:Several parameters, characterizing compactness of an active region, mean density of the magnetic flow, local gradients of the magnetic field show quasi-periodic oscillations with a period of about 48 hours. The oscillations of these parameters took place over a period of the flash-active phase of the active region. An empirical relationship has been found between the parameter, characterizing the magnetic moment of the group, and the flux of protons with the energy of 5 - 20 MeV.