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arXiv 0811.4319astro-ph
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半影磁场的拓扑

A topology for the penumbral magnetic fields

J. Sanchez Almeida

摘要:

我们描述了太阳黑子磁场拓扑结构的情况下,可能占最近的观察半影区的上升流和下降流。根据我们的推测,短而窄的磁环充满了半影区。沿着这些场线的流动是造成Evershed效应和对流输送的原因。这种情况似乎是定性与大多数现有的观测,包括暗核心的半影灯丝报告Scharmer等人。每个明亮的灯丝与暗核心将是一个系统的两个成对的对流卷与暗核心跟踪车道的等离子体下沉。磁回路在其中一个明亮的灯丝上有一个热的足点,在黑暗的核心上有一个冷的足点。这种情况也符合我们大多数的理论偏见(沿磁力线的虹吸流,翻转对流的存在,下降气流对磁力线的拖曳等)。如果这一猜想被证明是正确的,那么在半影中观察到的温和的向上和向下的速度必须随着当前空间分辨率的提高而增加。这和其他观测测试,以支持或反驳提出的情况。

英文摘要:

We describe a scenario for the sunspot magnetic field topology that may account for recent observations of upflows and downflows in penumbrae. According to our conjecture, short narrow magnetic loops fill the penumbral volume. Flows along these field lines are responsible for both the Evershed effect and the convective transport. This scenario seems to be qualitatively consistent with most existing observations, including the dark cores in penumbral filaments reported by Scharmer et al. Each bright filament with dark core would be a system of two paired convective rolls with the dark core tracing the lane where the plasma sinks down. The magnetic loops would have a hot footpoint in one of the bright filament and a cold footpoint in the dark core. The scenario also fits in most of our theoretical prejudices (siphon flows along field lines, presence of overturning convection, drag of field lines by downdrafts, etc). If the conjecture turns out to be correct, the mild upward and downward velocities observed in penumbrae must increase upon improvement of the current spatial resolution. This and other observational tests to support or disprove the proposed scenario are put forward.

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