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We present the results of an investigation of the relation betweenspace-weather parameters and cosmic ray (CR) intensity modulation usingalgorithm-selected Forbush decreases (FDs) from Moscow (MOSC) and Apatity(APTY) neutron monitor (NM) stations during solar cycle 23. Our FD locationprogram detected 408 and 383 FDs from MOSC and APTY NM stations respectively. Acoincident computer code employed in this work, detected 229 FDs that wereobserved at the same universal Time (UT) at the two stations. Out of the 229simultaneous FDs, we formed a subset of 139 large FDs(\%) $\leq-4$ at Moscowstation. We peformed a two dimensional regression analysis between the FDmagnitudes and the space-weather data on the two samples. We find that therewere significant space-weather disturbances at the time of the CR fluxdepressions. The correlation between the space-weather parameters and galacticcosmic ray (GCR) intensity decreases at the two NM stations are statisticallysignificant. The implications of the present space-weather data on cosmic ray(CR) intensity depressions are highlighted.

research in astronomy and astrophysics/research in astronomy and astrophysics

Investigation of the Relation between Space-Weather Parameters and  Forbush Decreases Automatically Selected from Moscow and Apatity Cosmic Ray  Stations during Solar Cycle 23