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The relationship between cosmic ray intensity decreases and solar events isstill an open field of space research. In this work a complete study of solarevents occurred from January 2003 to December 2005, is considered. Thisthree-years time period characterized by an unexpected activity of the Sun wasdivided into 27-day intervals starting from BR 2313 (06.01.2003) to 2353(21.12.2005), generating diagrams of the cosmic ray intensity data recorded atthe Athens Neutron Monitor Station. This station is working at an altitude of260m and cut-off rigidity 8.53GV provided to the Internet high-resolution datain real-time. A mapping of all available solar and interplanetary events, suchas solar flares with importance M and X, coronal mass ejections (Halo andPartial) was done. As we are going down from the solar maximum to the decliningphase of the 23rd solar cycle, a statistical overview of the correspondingrelationship among these phenomena, the significant percentage of theconnection of Halo CMEs and solar flares and the respective connection toForbush decreases on yearly and monthly basis are discussed. The closeassociation, as well as a probable quantitative analysis, between solar eventsis being denoted. The role of extreme solar events occurred in October /November 2003 and January 2005 is also discussed. Obtained results may beuseful for predictions of transient solar events and space weather forecasting.

Mapping of the cosmic ray events related to the solar activity for the period 2003-2005