%0 Journal Article %T Asymmetry in occurrence of the leading and following polarities in the photospheric magnetic field at the early stage of active region formation %A Grigoryev, V.M. %A Ermakova, L.V. %A Khlystova, A.I. %K magnetic field, active regions %J Solnechno-Zemnaya Fizika %D 2020 %N 6 %P 6 %I INFRA-M Academic Publishing LLC.