The time variation of the galactic cosmic rays (GCR) (1958–2006) is described using solar activity indices in the form $Z^\alpha$, $Z^\alpha\,\textbf{exp}[-(\varphi/\varphi_0)^\beta]$, where $Z$ and $\varphi$ are one of the solar activity indices and the heliolatitude of sunspots; $\alpha$, $\beta$ and $\varphi_0$ are the optimum parameters found by the least-squares method. The time variation of the GCR flux is satisfactorily described, the role of the active region heliolatitude in the index in relation to the cosmic ray modulation is revealed.
Institute of Nuclear Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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