Modification of interplanetary magnetic field by the Earth's magnetosphere a - SOLSPA 2001

We present an analytical solution for drapery around magnetosphere of interplanetary magnetic field which has an arbitrary direction far from the Earth. Extra assumptions about the manner of modification were used (i) the field is potential and (ii) there is no normal component on the magnetopause. The solution was constructed by selection of harmonics satisfying these conditions. The formula was used for estimations of maximums of Bz and B outside the surface depending on the direction and the value of initial field and for description of strong g/m storms of 1999-2000.