On the rotation rates of sunspot groups |
| |
Authors: | G Godoli F Mazzucconi |
| |
Institution: | (1) Cattedra di Fisica Solare, Università di Firenze, Firenze, Italia;(2) Osservatorio Astrofisico di Arcetri, Firenze, Italia |
| |
Abstract: | The analysis of Greenwich sunspot data for cycle No. 18 shows: (1) higher rotation rates for the southern sunspot belt than for the northern belt, (2) lower rotation rates and a tendency to a more rigid rotation for greater sunspot groups, (3) lower rotation rates and a tendency to a more rigid rotation for older sunspot groups, (4) no dependence of rotation rates on the life-time of sunspot groups, (5) a tendency to a more rigid rotation at the activity minimum. Results Nos. 2, 3, and 5 could be interpreted in terms of the evolution and interplay of the active regions, as the regions age. If we assume that the sunspot group life-time is a function of their depth in the solar atmosphere, result No. 4 shows that rotation rates do not depend on the depth. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|