Forbush decreases of cosmic radiation and connected space weather events

Authors analyse in the paper the temporal evolution of 34 selected decreases (Forbush Decrease - FD) observed by the Neutron Monitor (NM) of the Institute of Experimental Physics SAS at Lomnicky stit in the period of 1995 - 2007. Evolution of the individual FDs is supplemented by data on the proton density and the magnetic field intensity in the interplanetary space according to measurements at the satellites WIND and ACE and by data on the magnetic field and the proton density with different energy in the Earth's magnetosphere according to measurements at the satellites GOES 8 - 11. Results of the analysis are summarized. It is shown that besides the known disturbance in the magnetic field of the Earth is the FD in the majority of events accompanied by an abrupt increase (up to 4 orders of magnitude) of the proton flux in the magnetosphere with energy of 0.4 - 4 MeV and by a contemporary decrease of the proton flux with energy of 165 - 500 MeV. (authors)