Connection Between Solar Hemispheric Toroidal Cycles and Geomagnetic Variations

The solar activity has hemispheric asymmetries. The levels of activity are different on the two hemispheres on intermediate and longer time scales. During four Schwabe cycles the progress of the northern hemispheric activity precedes the southern one, while in the next four cycles the southern cycle takes over the preceding role (Murakozy and Ludmany, Mon. Not. Roy. Astron. Soc.419, 3624, 2012; Murakozy, Astrophys. J.826, 145, 2016). The interplanetary magnetic field is formed by the distribution of the solar magnetic fields and the outward-streaming solar wind. The present study intends to show how the solar-hemispheric predominance affects the interplanetary and geophysical magnetic field. The interplanetary and geophysical data sets have been chosen from various sources such as the components of the interplanetary magnetic field [B], cosmic-ray data, Ap, aa, and Dst geomagnetic indices, while the solar-hemispheric asymmetry has been examined by using sunspot data from Greenwich Photoheliographic Results (GPR) and Debrecen Photoheliographic Data (DPD).