cycle for the time interval of 1970–1996. The cycle of the large-scale magnetic field (LSMF)
begins in the vicinity of maximum Wolf numbers, ie during the polar field reversal. At the
beginning of the LSMF cycle, the polar and mid-latitude magnetic field systems are
connected by a narrow bridge, but later they evolve independently. The polar field at the
latitudes above 60° has a completely open configuration and fills the whole area of the polar …