Inceoglu Fadil, Arlt Rainer
Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, USA.
National Centers for Environmental Information, National Oceanic and Atmospheric Administration, Boulder, CO, USA.
Sci Rep. 2024 Oct 8;14(1):23425. doi: 10.1038/s41598-024-74825-3.
In this study, we simulate 30,000 years of solar activity using turbulent-alpha (TA) and Babcock-Leighton (BL) mechanisms in a non-kinematic, nonlinear mean field flux-transport solar dynamo model. We evaluate their performances against observational data from proxies, like C, and direct solar observations. Both the TA and BL dynamos generate Schwabe-like variations, with the TA dynamo also generating periods that can be related to the QBOs and the Gleissberg cycle. The TA dynamo spends 13.3% (12.2%) of its time in a grand minimum (maximum) state, closely match the historical solar activity reconstructions from proxy records, while the BL dynamo underperforms. For the TA dynamo, the Schwabe cycle length variations during grand minima and the latitudinal and radial dependencies of the amplitude of variations both in Schwabe and QBO timescales align well with C data and solar observations, whereas the BL dynamo fails to reproduce these features.
在本研究中，我们在一个非运动学、非线性平均场通量传输太阳发电机模型中，使用湍流α（TA）和巴布科克 - 莱顿（BL）机制模拟了30000年的太阳活动。我们根据来自代理指标（如碳-14）的观测数据以及直接的太阳观测数据来评估它们的性能。TA和BL发电机都产生类似施瓦贝的变化，TA发电机还产生了与准两年振荡（QBO）和格利高里周期相关的周期。TA发电机有13.3%（12.2%）的时间处于大极小值（极大值）状态，与代理记录的历史太阳活动重建结果非常匹配，而BL发电机表现不佳。对于TA发电机，大极小值期间施瓦贝周期长度的变化以及施瓦贝和QBO时间尺度上变化幅度的纬度和径向依赖性与碳-14数据和太阳观测结果吻合良好，而BL发电机无法再现这些特征。
