Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...730...49l&link_type=abstract
The Astrophysical Journal, Volume 730, Issue 1, article id. 49 (2011).
Astronomy and Astrophysics
Astronomy
3
Sun: Activity, Sun: Rotation, Sunspots
Scientific paper
The continuous wavelet transformation is used to study the temporal variations of the rotational cycle length of daily sunspot numbers from 1849 January 1 to 2010 February 28, from a global point of view. The rotational cycle length of the Sun is found to have a secular trend, which statistically shows a linear decrease by about 0.47 days during the time interval considered. The empirical mode decomposition analysis of the temporal variations of the rotational cycle length shows an acceleration trend for the surface rotation rate from cycles 11 to 19, but a deceleration trend from the beginning of cycle 20 onward. We cannot determine whether the rotation rate around the maximum times of the Schwable cycles should be faster or slower than that around the minimum times, implying no Schwable cycle in the long-term variations of rotation. The results obtained are compared to those from the literature. It is inferred that the variation of the rotational cycle length may be related to the variation of sunspot activity in the long run.
Feng Wanxiang
Li Kai-Jun
Liang Hong-Fei
Shi Xiang-Jun
Xie Jin-Lin
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