SPOTLESS FLARE ACTIVITY

The distribution of spotless flares (SFs) covering the time interval b etween 1947 and 1990 was investigated. The (11-20-degrees) latitude zo ne was found as the most prolific region for the occurrence of SFs. Th e longitudinal distribution of SFs occurred most frequently at six or more places on the solar surface. In addition, the asymmetry of SF act ivity on the solar disk was also studied in this paper. The variation of the asymmetry was compared with other solar activity manifestations . The existence of secondary maxima of SFs appears to be an important result of our analysis. A one-year shift was found when the number of events was plotted versus the year.