Аннотация:Abstract The state of the magnetosphere is influenced by the effects driven from
the solar surface. The models of geomagnetic field are parametrized by the mag-
netopshere activity indices which are related to IMF and solar wind characteris-
tics. Cosmic rays could serve as a tool for ”remote sensing” of the redistribution
of IMF structure in interplanetary space and for checking validity of geomagnetic
field models with external current systems. The anisotropy of cosmic rays observed
on the ground is influenced by superposition of (a) interplanetary anisotropy due to
transitional effects and by (b) variable transmissivity of magnetosphere itself. The
possibilities to deconvolute the two dependences is discussed. Anisotropy observed
at neutron monitors and muon telescopes just before the onset of some geomag-
netic storms is reviewed. The changes of geomagnetic cut-off, structure of the trans-
missivity function and asymptotic directions for various geomagnetic field models
during strong geomagnetic storms are discussed. Low altitude polar orbiting satel-
lites with large geometric factors for high energy particles (e.g. CORONAS-F) are
suitable for (a) estimates of energy spectra of solar or interplanetary accelerated
particles by checking the outer zone boundary of trapping and for (b) checking how
the different geomagnetic field models are fitting the observed trapped particle pro-
files in different local time sectors. Independently on the state of magnetosphere,
the measurements of energetic ”neutral emissions” (gammas and neutrons) near the
Earth or on the ground, serve as indicator of acceleration processes on solar surface.