The Field Configuration of Magnetic Clouds and the Solar Cycle

摘要: By means of solar wind measurements from near-Earth spacecraft, the field structure magnetic clouds (MCs) for years 1965-1993 was investigated. A cycle variation appears in orientation clouds. From about time sunspot maximum 1981, example, most MCs had northward-directed fields leading southward-directed ones. Since 1991, have led northward MCs. Their axial are equally distributed between eastward-directed and westward-directed, there as many with right-hand rotating left-hand ones regardless phase cycle. The found to be associated Hα filament disappearances at Sun, their properties interpreted terms known fields, namely, that predominant direction each hemisphere reverses does overlying channels.