On the Cause of the Discrepancy Between Groundbased and Spaceborne Lightcurves of Galilean Satellites of the Jupiter

Photometric observations of Jupiter's satellites were performed in the spectral band V in Scientific Research Institute “CrAO”. Their light curves were calculated to the phase angle of the Sun equal 6o. Comparison of data with other Earth observations showed good agreement. The cause of discrepancies with the data obtained with the spacecraft is the backscattering effect of sunlight, it depends on the Sun phase angle. The satellite Callisto has leading dark hemisphere due to the fact that at this distance the magnetic field of Jupiter diminished, and bodies of the interplanetary medium bomb out it.