摘要: Interplanetary magnetic field data obtained by Mariner 10 between November 1973 and March 1974 are examined. Though large variations in the due to effects of high speed streams stream-stream interactions were observed, on average scale interplanetary radial component was found have a distance dependence r minus 2.0 plus or 0.3, while azimuthal vary as 1.3 0.4, 1.4 0.6 for normal solar equatorial plane. A close correspondence stream signatures persistent but evolving coronal hole regions sun, clear pattern southward fields interaction levels fluctuations within high-speed detected.