Two types of expansion onsets in the Earth's two hemispheres

Vladimir Mishin1, Vilen M Mishin2, Matthias Foerster3, Marina Kurikalova1, Yuri Karavaev1 and Sergei Lunyushkin1, (1)Institute of Solar-Terrestrial Physics SB RAS, Irkutsk, Russia, (2)Inst Solar Terrestrial Physics, Irkutsk, Russia, (3)Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, German Research Centre for Geosciences, Potsdam, Germany