Structure of the Heliospheric Current Sheet derived for the interval 1915-1916

Hα observations of solar large-scale fields were used to reconstruct the heliosphere structure for the time interval of 1915-1996. A special method of polar correction was developed. The expansion coefficients in Legendre polynomials were calculated. An atlas of the heliosphere structure was compiled. `Inferred' strength of the polar and equatorial field in 1915-1996 years was calculated. Cyclic variations of the polar field and the number of polar plages were compared to show a satisfactory agreement. The q parameter, characterizing the divergence of the polar plumes in the epochs of the solar minimum, was calculated and its quasi-periodic behaviour with a period of the order of 70years was revealed. Our calculations were tentatively compared with the interplanetary magnetic field structure.