Systematic regularity of solar coronal rotation during the time interval 1939-2019
Systematic regularity of solar coronal rotation during the time interval 1939-2019
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1939-2019年期间太阳日冕自转的系统规律
DOI：
10.1093/mnras/stz3136
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发表时间：
2020-01-01
影响因子：
4.8
通讯作者：
Wang, F.
中科院分区：
文献类型：
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作者：
Deng, L. H.;Zhang, X. J.;Wang, F.
日冕自转的时间变化似乎非常复杂，其与11年太阳活动周期的关系尚不清楚。利用改进的日冕指数，研究了1939年1月1日至2019年5月31日太阳日冕旋转的系统规律。我们的主要发现如下。(1)从全球角度看，在小于64天的周期尺度上，滑水日冕旋转周期为27.5 d是唯一有意义的周期。(2)日冕自转周期在考虑的时间间隔内呈现明显的减小趋势，说明日冕在长期内加速了其全球自转速率。(3)日冕自转存在3.25、6.13、9.53和11.13年的显著周期，说明日冕自转与准两年周期振荡、11年太阳周期和22年Hale周期（即地磁活动逆转）有关。(4)日冕自转周期与太阳磁活动的相位关系不仅具有时变关系，而且具有频率关系。在11年周期带附近的一个小范围内，相位存在系统的趋势，该带的一个小的失配会导致相位漂移。讨论了上述分析结果的可能机理。
The temporal variation of solar coronal rotation appears to be very complex and its relevance to the 11-year solar activity cycle is still unclear. Using the modified coronal index for the time interval from 1939 January 1-2019 May 31, the systematic regularities of solar coronal rotation are investigated. Our main findings are as follows. (1) From a global point of view, the synodic coronal rotation period with a value of 27.5 days is the only significant period at periodic scales shorter than 64 days. (2) The coronal rotation period exhibits an obvious decreasing trend during the time interval considered, implying that the solar corona accelerates its global rotation rate in the long run. (3) Significant periods of 3.25, 6.13, 9.53 and 11.13 years exist in coronal rotation, providing evidence that coronal rotation should be connected with the quasi-biennial oscillation, the 11-year solar cycle and the 22-year Hale cycle (or magnetic activity reversal). (4) The phase relationship between the coronal rotation period and solar magnetic activity is not only time-dependent but also frequency-dependent. For a small range around the 11-year cycle band, there is a systematic trend in phase and a small mismatch in this band causes the phase to drift. The possible mechanism for the above analysis results is discussed.