Anomalies in the evolution of global and large-scale solar magnetic fields as the precursors of several upcoming low solar cycles

Astronomy Letters (Impact Factor: 1.3). 01/2009; 35(4):247-252. DOI: 10.1134/S1063773709040045

ABSTRACT Anomalies in the solar magnetic fields of various scales are studied. The polar magnetic field strength is shown to have decreased
steadily during the last three solar cycles. This is because the increase in the dipole magnetic moment observed from 1915
to 1976 has changed into a decrease in the last three cycles. At the same time, the medium scale magnetic fields (like those
of isolated coronal holes) have been unusually strong in the last cycle. As a result, the tilt of the heliospheric current
sheet is still about 30°. The large effective contribution from the medium scale fields to the total energy of the large-scale
fields is also confirmed by our calculations of the effective multipolarity index. The aa-index at the cycle minima is correlated
with the height of the succeeding maxima. The set of data considered may be indicative of the possible approach of a sequence
of low solar cycles.

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