We investigate the heliographic latitude-longitude structure of solar wind speed between Sept. 1985 and Jan. 1987 through the analysis of the solar wind data obtained by Sakigake, Suisei, and IMP-8. Until Jan. 1986,both polar regians had a high-speed stream extended across the equatorial region. After Feb. 1986,high-speed streams were rarely seen on the equator and low-speed streams were ranged along the equator, although there remained a slight wavy pattern in the latitude-longitude structure. This wavy pattern has been stable till the end of 1986.
太陽風速度構造の惑星間空間多点観測
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