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首页> 外文期刊>The Astrophysical journal >RECONSTRUCTION OF AN INDUCTIVE VELOCITY FIELD VECTOR FROM DOPPLER MOTIONS AND A PAIR OF SOLAR VECTOR MAGNETOGRAMS
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RECONSTRUCTION OF AN INDUCTIVE VELOCITY FIELD VECTOR FROM DOPPLER MOTIONS AND A PAIR OF SOLAR VECTOR MAGNETOGRAMS

机译：从多普勒运动和一对太阳矢量磁象学重构感应速度场矢量

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摘要

We outline a general methodology to infer the inductive velocity field vector in solar active regions. For the first time, both the field-aligned and the cross-field velocity components are reconstructed. The cross-field velocity solution accounts for the changes of the vertical magnetic field seen between a pair of successive active region vector magnetograms via the ideal induction equation. The field-aligned velocity is obtained using the Doppler velocity and the calculated cross-field velocity. Solving the ideal induction equation in vector magnetograms measured at a given altitude in the solar atmosphere is an underdetermined problem. In response, our general formalism allows the use of any additional constraint for the inductive cross-field velocity to enforce a unique solution in the induction equation. As a result, our methodology can give rise to new velocity solutions besides the one presented here. To constrain the induction equation, we use a special case of the minimum structure approximation that was introduced in previous studies and is already employed here to resolve the 180° ambiguity in the input vector magnetograms. We reconstruct the inductive velocity for three active regions, including NOAA AR 8210, for which previous results exist. Our solution believably reproduces the horizontal flow patterns in the studied active regions but breaks down in cases of localized rapid magnetic flux emergence or submergence. Alternative approximations and constraints are possible and can be accommodated into our general formalism.
机译：我们概述了一种推断太阳活动区域中感应速度场矢量的通用方法。第一次，场校正和交叉场速度分量都被重建。跨场速度解考虑了通过理想感应方程在一对连续的活动区域矢量磁图之间看到的垂直磁场的变化。使用多普勒速度和计算出的交叉场速度获得场对准速度。解决在给定高度下在太阳大气中测量的矢量磁图中的理想感应方程是一个不确定的问题。作为回应，我们的一般形式主义允许对归纳交叉场速度使用任何其他约束，以在归纳方程中强制执行唯一解。结果，除了这里介绍的方法外，我们的方法还可以产生新的速度解。为了约束感应方程，我们使用了在先前研究中引入的最小结构近似的特殊情况，并已在这里用于解决输入矢量磁图中的180°歧义。我们重建了三个活动区域（包括NOAA AR 8210）的感应速度，对此存在先前的结果。我们的解决方案令人信服地再现了所研究的活动区域中的水平流动模式，但在局部快速磁通出现或浸没的情况下崩溃了。替代近似和约束是可能的，并且可以纳入我们的一般形式主义中。

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