论文标题
旋转对流区底部附近形成不稳定的通量管：低纬度的可能的解释
Flux-tubes forming instability near the base of the rotating convection zone: A possible explanation for low latitudes of sunspots
论文作者
论文摘要
从对流区的底部到太阳表面的磁场的升高已被证实是黑子形成的可能机制。然而，足够强度（〜10^5 g）的通量管的起源尚不确定。本文认为，由于对流热传输的磁抑制作用是通量管形成机构的候选，因此将大规模环形磁场的不稳定性引起。该考虑采用了涡流扩散对平均磁场水力动力学提供的磁场的分析依赖性。不稳定性倾向于在对流区的底部以100 mm的空间尺度产生田间强度提高的区域。与11年周期相比，不稳定性的特征增长时间短。不稳定性发作的阈值场强度从赤道附近的几百个高斯增加到中纬度的一些公斤高卢。不稳定干扰的增长率随纬度的降低。这些纬度趋势可能是观察到黑子活性与近乎赤道带的限制的原因。
The rise of flux-tubes with intense magnetic fields from the base of the convection zone to the solar surface has been substantiated as a probable mechanism for sunspot formation. The origin of flux-tubes of sufficient strength (~10^5 G) is however uncertain. This paper considers the instability of a large-scale toroidal magnetic field caused by the magnetic suppression of convective heat transport as a candidate for the flux tube forming mechanism. The consideration employs the analytical dependence of the eddy diffusion on the magnetic field supplied by mean-field magnetohydrodynamics. The instability tends to produce regions of increased field strength with spatial scales of an order of 100 Mm at the base of the convection zone. Characteristic growth times of the instability are short compared to the 11-year cycle. The threshold field strength for the onset of the instability increases from several hundred Gauss in the vicinity of the equator to some kilo-Gauss at middle latitudes. Growth rates of unstable disturbances decrease with latitude. These latitudinal trends can be the reason for the observed confinement of sunspot activity to a near-equatorial belt.
