Determination of the Rotation Periods of Solar Active Longitudes |
| |
| Authors: | L A Plyusnina |
| |
| Institution: | 1.Institute of Solar-Terrestrial Physics,Irkutsk,Russia |
| |
| Abstract: | There are two types of active longitudes (ALs) in terms of the distribution of sunspot areas: long-lived and intra-cyclic
ALs. The rotation period of the long-lived ALs has been determined by a new method in this paper. The method is based on the
property of ALs to be maintained over several cycles of solar activity. The daily values of sunspot areas for 1878 – 2005
are analyzed. It is shown that the AL positions remain almost constant over a period of about ten cycles, from cycle 13 to
cycle 22. The rotation period was found to be 27.965 days during this period. The dispersion in AL positions is about 26°
from cycle to cycle, which is half of the dispersion observed in the Carrington system. The ALs in the growth phase of the
activity cycle are more stable and pronounced. The excess in solar activity in the ALs over adjacent longitudinal intervals
is about 12 – 14%. It is shown that only one long-lived AL can be observed at one time on the Sun, as a rule. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
