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Multi-spacecraft observations of heliographic structure of the solar wind speed |
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| Authors: | W. Miyake K. Kobayashi K. -I. Oyama and T. Mukai T. Abe T. Terasawa K. Yumoto and T. Saito K. Hirao A. J. Lazarus A. D. Johnstone |
| Affiliation: | Hiraiso Solar Terrestrial Research Center, Communications Research Laboratory, 3601 Isozaki, Nakaminato, Ibaraki 311-12, Japan Chiba Institute of Technology, Narashino-shi, Chiba 275, Japan Institute of Space and Astronautical Science, Yoshinodai, Sagamihara 229, Japan University of Electro-Communications, Chofu-shi, Tokyo 275, Japan Geophysical Institute, Kyoto University, Sakyo, Kyoto 606, Japan Onagawa Magnetic Observatory and Geophysical Institute, Tohoku University, Sendai 980, Japan Department of Aeronautics and Astronautics, Tokai University, Kitakaname, Hiratsuka, Kanagawa, Japan Massachusetts Institute of Technology, Cambridge, MA 02139, U.S.A. Mullard Space Science Center, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT, U.K. |
| Abstract: | Multi-spacecraft observations in the interplanetary space are used to build up a picture of the distribution of solar wind velocities in heliographic latitude and longitude. Analyses are made for the solar wind data obtained by Sakigake, Suisei, IMP-8 and Giotto between late 1985 and early 1987. Until Janaury 1986, high-speed streams were extended across the equator from the high latitudes of the heliosphere. After March 1986, high-speed streams were rarely seen on the equator. Although there remained a slight wavy pattern in latitude-longitude structure, low-speed streams were basically ranged along the equator. After January 1987, the amplitude of this wavy pattern was further diminished and low-speed regions were completely aligned to the equator. |
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