Cosmic ray variation properties during Forbush effects associated with far western solar sources

By the data from neutron monitor network and relevant measurements of the solar wind parameters a set of Forbush effects have been studied, which occurred on the background of quite or unsettled interplanetary and geomagnetic conditions and are associated with the far western events on the Sun. These Forbush effects may be referred to a special subclass of events, with the characteristics closed to the event in July 2005 and incorporated by the common conditions: absence of a significant disturbance in the Earth vicinity; absence of the strong geomagnetic storm; slow decrease of cosmic ray intensity during the main phase of the Forbush effect. The general features and separate properties in behavior of density and anisotropy of 10 GeV cosmic rays for this subclass are investigated and compared with those during the Forbush effects from far eastern sources. (authors)