Solar meridional motions derived from sunspot observations

Details Solar meridional motions derived from sunspot observations Solar meridional motions derived from sunspot observations

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..132...41k&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 132, March 1991, p. 41-48.

Physics

8

Meridional Flow, Photosphere, Solar Cycles, Solar Rotation, Sunspot Cycle, Energy Transfer, Japan, Solar Observatories

Scientific paper

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 m/s was found, which is equatorward in the latitude range from -20 to + 15 deg and is poleward at higher latitudes in both hemispheres. A northward flow of 0.01 deg/day or 1.4 m/s at mid-latitudes (between 10 deg and 20 deg) was also detected. From the limited data-set of three solar cycles, an indication of solar-cycle dependence of meridional motions was found.

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