✦ LIBER ✦

Solar meridional motions derived from sunspot observations

✍ Scribed by M. A. Kambry; J. Nishikawa; T. Sakurai; K. Ichimoto; E. Hiei

Publisher: Springer
Year: 1991
Tongue: English
Weight: 395 KB
Volume: 132
Category: Article
ISSN: 0038-0938
DOI: 10.1007/bf00159128

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✦ Synopsis

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 -~ 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 i 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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