Physics
Scientific paper
May 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...42....3s&link_type=abstract
Solar Physics, vol. 42, May 1975, p. 3-16. Research supported by the Deutsche Forschungsgemeinschaft.
Physics
31
Calcium, Chromosphere, Fine Structure, Meridional Flow, Solar Rotation, Angular Velocity, Metal Ions, Photosphere, Random Processes, Solar Atmosphere, Solar Spectra, Sunspots
Scientific paper
From high-precision computer-controlled tracings of bright Ca(+)-mottles, we investigated differential rotation, meridional motions, and random motions of these chromospheric fine structures. The equatorial angular velocity of the Ca(+)-mottles agrees well with that of sunspots (14.50 deg per day, sidereal) and is 5% higher than for the photosphere. The slowing down with increasing latitude is larger than for sunspots. Hence in higher latitudes Ca(+)-mottles rotate as fast as the photospheric plasma. A systematic meridional motion of about 0.1 km per sec for latitudes around 10 deg was found. The Ca(+)-mottles show horizontal random motions due to the supergranular flow pattern with an rms velocity of about 0.15 km per sec. We finally investigated the correctness of the solar rotation elements i and Omega derived by Carrington (1863).
Schroeter E. H.
Woehl Hubertus
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