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Quasi-biennial oscillation (QBO) of solar magnetic activities is intrinsic todynamo mechanism, but still far from fully understood. In this work, the phaseand amplitude asymmetry of solar QBO of Halpha flare activity in the northernand southern hemispheres is studied by the ensemble empirical modedecomposition, the cross-correlation analysis, and the wavelet transformtechnique. The following results are found: (1) solar QBO of Halpha flare indexin the two hemispheres has a complicated phase relationship, but does not showany systematic regularity; (2) the solar cycle mode of solar Halpha flare indexin the northern hemisphere generally leads that in the southern one by 9 monthsfor the time interval from 1966 to 2014. The possible origin of these resultsis discussed.

Phase and amplitude asymmetry in the quasi-biennial oscillation of solar Halpha flare activity