Abstract
From high precision computer controlled tracings of bright Ca+-mottles we investigated differential rotation, meridional and random motions of these chromospheric fine structures. The equatorial angular velocity of the Ca+-mottles agrees well with that of sunspots (14°.50 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 s−1 for latitudes around 10° was found. The Ca+-mottles show horizontal random motions due to the supergranular flow pattern with an rms velocity of about 0.15 km s−1. We finally investigated the correctness of the solar rotation elements i and Ω derived by Carrington (1863).
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Abetti, G.: 1932, in Handbuch der Astrophysik, Vol. IV, Berlin.
Astronomical Ephemeris for the Year 1974, London.
Busse, F. H.: 1970, Astrophys. J. 15, 629.
Carrington, R. C.: 1863, Observations of the Spots on the Sun from November 9, 1853, to March 24, 1861, made at Redhill, London.
Evershed, J.: 1935, Monthly Notices Roy. Astron. Soc. 95, 503.
Gilman, P. A.: 1974, in Annual Review of Astronomy and Astrophysics, Vol. 12, p. 47.
Hansen, R. T., Hansen, S. F., and Loomis, H. G.: 1969, Solar Phys. 10, 135.
Howard, R. and Harvey, J.: 1970, Solar Phys. 12, 23.
Kiepenheuer, K. O.: 1953 in G. P. Kuiper (ed.), The Sun, Chicago, p. 350.
Kiepenheuer, K. O.: 1963, in J. Rösch (ed.), ‘Site Testing’, IAU Symp. 19, 196.
Köhler, H.: 1971, Solar Phys. 13, 3.
Livingston, W. C.: 1969a, Solar Phys. 7, 144.
Livingston, W. C.: 1969b, Solar Phys. 9, 448.
Newton, H. W. and Nunn, M. L.: 1951, Monthly Notices Roy. Astron. Soc. 111, 413.
Piddington, J. H.: 1971, Solar Phys. 21, 4.
Plaskett, H. H.: 1952, Monthly Notices Roy. Astron. Soc. 112, 414.
Plaskett, H. H.: 1970, Monthly Notices Roy. Astron. Soc. 148, 149.
Schröter, E. H. and Wiehr, E.: 1968, Min. Astron. Ges. 25, 187.
Simon, G. W. and Noyes, R. W.: 1972, Solar Phys. 26, 8.
Tuominen, J.: 1955, Z. Astrophys. 37, 145.
Waldmeier, M.: 1955, Ergebnisse und Probleme der Sonnenforschung, 2nd ed., Leipzig, p. 43.
Ward, F.: 1966, Astrophys. J. 145, 416.
Wilcox, J. M.: 1972, in K. Schindler (ed.), Cosmic Plasma Physics, New York, p. 157.
Wilcox, J. M. and Howard, R.: 1970, Solar Phys. 13, 251.
Wöhl, H.: 1972, Min. Astron. Ges. 32, 164.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Schröter, E.H., Wöhl, H. Differential rotation, meridional and random motions of the solar Ca+ network. Sol Phys 42, 3–16 (1975). https://doi.org/10.1007/BF00153278
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00153278