QUASI-BIENNIAL OSCILLATIONS OF THE SOLAR MAGNETIC FIELDS

摘要

Quasi-biennial oscillations (QBO) are mainly revealed in the structure of large-scale solar magnetic fields (LSMF). In the medium-scale fields, they are weak. QBO are well-pronounced in the time-latitude diagrams and correlograms, as well as in the spectra of the source-surface magnetic field sector structure. Thus, QBO are actually variations of the equatorial dipole and quadrupole. QBO are also clearly seen in the indices characterizing the asymmetry of the LSMF parameters. The QBO intensity in LSMF changes with time, being maximum in the middle of the 20th century. The relationship between QBO in LSMF and the cycle reference points is investigated.