Differential rotation, meridional and random motions of the solar Ca+network

✍ Scribed by E. H. Schröter; H. Wöhl

• Publisher: Springer
• Year: 1975
• Tongue: English
• Weight: 724 KB
• Volume: 42
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00153278

✦ Synopsis

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.~ per day, sidereal) and is 5 700 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 Q derived by Carrington (1863).