  To study and forecast the solar activity data a quite perspective method of
singular spectrum analysis (SSA) is proposed. As known, data of the solar
activity are usually presented via the Wolf numbers associated with the
effective amount of the sunspots. The advantages and disadvantages of SSA are
described by its application to the series of the Wolf numbers. It is shown
that the SSA method provides a sufficiently high reliability in the description
of the 11-year solar cycle. Moreover, this method is appropriate for revealing
more long cycles and forecasting the further solar activity during one and a
half of 11-year cycle.
