Аннотация:Experimental data on solar activity (sunspot number, induction of solar polar magnetic field Bp,
and others), characteristics of interplanetary space, and cosmic ray fluxes testify that the Sun has entered a
deep minimum of its activity similar to the Dalton minimum. An almost functional relationship was found
between maximum values of Bpmax observed in the solar activity minimum of the 11-year cycle and the previous sunspot maximum. Based on this relationship, a simple method of forecasting maximum number of
sunspots Rzmax and time course Rz(t) was developed. A forecast of the 25th solar cycle is given.