Observations of the Sun-Earth system within the CORONAS-F mission (July 31, 2001 to December 6, 2005)

The results of the study of solar active phenomena and their manifestations in the near-Earth space observed in the declining phase of the current activity cycle within the CORONAS-F space mission are presented. During its orbital operation from July 31, 2001 to December 6, 2005, the CORONAS-F satellite recorded a series of outstanding solar events and associated effects in solar cosmic rays in the Earth's magnetosphere. The paper contains a morphological description of outstanding solar events of November 4, 2001, October-November 2003, November 6-10, 2004, January and September 2005 and the related effects in the geospace such as detection of flare-generated gamma radiation, enhanced energetic particle fluxes, and solar neutrons; deformation of the magnetosphere; displacements of the polar cap boundary and penetration boundary of particles to small heights; changes of the boundary positions, maxima, and dynamics of the radiation belts during strong magnetic storms.