Solar meridional motions derived from sunspot observations |
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| Authors: | M A Kambry J Nishikawa T Sakurai K Ichimoto E Hiei |
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| Institution: | (1) National Astronomical Observatory, 181 Mitaka, Tokyo, Japan;(2) Present address: Indonesian National Institute of Aeronautics and Space, Ionospheric Research and Development Center (LAPAN) Jl, Dr Junjunan 135, P.O. Box 26, 40173 Bandung, Indonesia;(3) Present address: Hiraiso Solar Terrestrial Research Center, Communications Research Laboratory, Ministry of Post and Telecommunication, Isozaki, Nakaminato, 311-12 Ibaraki, Japan |
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| Abstract: | Sunspot drawings obtained at the National Astronomical Observatory of Japan during the years 1954–1986 were used to determine meridional motions of the Sun. A meridional flow of a few ms–1 was found, which is equatorward in the latitude range from -20° to +15° and is poleward at higher latitudes in both hemispheres. A northward flow of 0.01° day–1 or 1.4 ms–1 at mid-latitudes (between 10° and 20°) was also detected. From our limited data-set of three solar cycles, an indication of solar-cycle dependence of meridional motions was found. |
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