湍流侵蚀模型框架下慢衰减单极活动区寿命的估算
Estimation of the lifetime of slow-decaying unipolar active regions in the framework of the turbulent erosion model
AI总结：
本研究在湍流侵蚀模型框架下分析慢衰减单极太阳黑子，发现其磁结构半径恒定减小支持该模型，但部分案例衰减速度过低导致寿命和面积高估，并探讨了其他可能机制。
摘要：
我们在Petrovay和Moreno-Insertis（1997）提出的湍流侵蚀模型框架下，探讨了慢衰减单极太阳黑子群的性质和行为。该模型的基本概念是，强磁场会抑制磁通量管内部的湍流扩散率。因此，外部湍流等离子体主要从磁通量管的外边界剥离磁特征。磁通量管的半径以恒定速率向内推进。该模型预测较老的太阳黑子衰减较慢，这似乎非常有希望解释长寿单极太阳黑子群的缓慢衰减。通过分析与太阳黑子相关的磁结构，我们确实发现磁结构半径以恒定速率逐渐减小，这暗示了该模型的有效性。然而，在某些情况下，推导出的半径减小速度过低：我们的计算为这类太阳黑子的寿命和最大面积提供了不合理的高估。我们讨论了可能影响这类特殊太阳黑子衰减率的其他机制。
英文摘要：
We explore properties and behavior of slow-decaying unipolar sunspot groups in the framework of the turbulent erosion model suggested by Petrovay and Moreno-Insertis (1997). The basic concept of the model is the suppression of a turbulent diffusivity inside a magnetic flux tube by strong magnetic fields. As a result, the outer turbulent plasma detaches magnetic features primarily from the external border of a magnetic flux tube. The radius of the tube exhibits inward progression at a constant rate. The model predicts older sunspots to decay slower and it seems to be very promising to explain the slow decay of long-living unipolar sunspot groups. By analyzing the magnetic structure associated with a sunspot, we did reveal a gradual decrease of the magnetic structure radius at a constant rate implying the validity of the model. However, in some cases the derived velocity of the radius decrease was too low: our calculations provided implausibly high estimations for the lifetime and maximal area of such sunspots. We discuss possible additional mechanisms affecting the decay rate of such peculiar sunspots.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
