Search for Predictors of Forbush Decreases

Anisotropy of cosmic rays (CR) before a lot of Forbush decreases (FDs) was investigated by methods of the global survey and the “station ring” (SR) using the data of the world wide neutron monitor (NM) network. It has been found that predecreases and preincreases precede to the majority of FD onsets. They are anisotropic and characterized by the nonharmonical directional distribution. The longitudinal dependence change abruptly near the field line and depends on a character of the disturbance and its source. Appeared for a long time before FDs (up to day) these effects may be considered as the predictors of FDs.