Structure of the heliospheric current sheet derived for the interval 1915-1916

H alpha observations of solar large-scale fields were used to reconstruct t he heliosphere structure for the time interval of 1915-1996. A special meth od of polar correction was developed. The expansion coefficients in Legendr e polynomials were calculated. An atlas of the heliosphere structure was co mpiled. 'Inferred' strength of the polar and equatorial field in 1915-1996 years was calculated. Cyclic variations of the polar field and the number o f polar plages were compared to show a satisfactory agreement. The q parame ter, characterizing the divergence of the polar plumes in the epochs of the solar minimum, was calculated and its quasi-periodic behaviour with a peri od of the order of 70 years was revealed. Our calculations were tentatively compared with the interplanetary magnetic field structure.