Solar-Cycle-Related Variations in the Solar Differential Rotation and Meridional Flow: A Comparison |
| |
| Authors: | J Javaraiah R K Ulrich |
| |
| Institution: | (1) Indian Institute of Astrophysics, Bangalore, 560034, India;(2) Department of Physics and Astronomy, UCLA, 430 Portola Plaza, Los Angeles, CA, 90095-1547, U.S.A. |
| |
| Abstract: | We have analysed a large set of sunspot group data (1874 – 2004) and find that the meridional flow strongly varies with the
phase of the solar cycle, and the variation is quite different in the northern and the southern hemispheres. We also find
the existence of considerable cycle-to-cycle variation in the meridional velocity, and about a 11-year difference between
the phases of the corresponding variations in the northern and the southern hemispheres. In addition, our analysis also indicates
the following: (i) the existence of a considerable difference (about 180°) between the phases of the solar-cycle variations in the latitude-gradient terms of the northern and the southern hemispheres’
rotations; (ii) the existence of correlation (good in the northern hemisphere and weak in the southern hemisphere) between the mean solar-cycle
variations of meridional flow and the latitude-gradient term of solar rotation; (iii) in the northern hemisphere, the cycle-to-cycle variation of the mean meridional velocity leads that of the equatorial rotation
rate by about 11 years, and the corresponding variations have approximately the same phase in the southern hemisphere; and
(iv) the directions of the mean meridional velocity is largely toward the pole in the longer sunspot cycles and largely toward
the equator in the shorter cycles. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
