  Solar magnetic synoptic charts obtained by NSO/Kitt Peak and SOHO/MDI are
analyzed for studying the appearance of bipolar magnetic regions (BMRs) during
solar minima. As a result, we find the emergence of long-lived BMRs has three
typical features. (1) BMRs' emerging rates of the new cycles increase about 3
times faster than those of the old cycles decrease. (2) Two consecutive solar
cycles have an overlapping period of near 10 Carrington rotations. During this
very short overlapping time interval, BMRs of two cycles tend to concentrate in
the same longitudes. (3) About 53% BMRs distribute with a longitudinal distance
of 1/8 solar rotation. Such phenomenon suggests a longitudinal mode of m=8
existing during solar minima.
