日冕模拟中磁力线滑移率的计算
Calculation of Field Line Slippage Rates in Coronal Simulations
AI总结：
该研究推出通用滑移计算器USlip（通用磁力线追踪器UFiT的扩展），用于计算日冕模拟中的磁力线滑移率，经解析解和多平台模拟验证，可诊断动态系统的三维重联。
AI中文摘要：
我们推出通用滑移计算器（\ exttt{USlip}），它是通用磁力线追踪器（\ exttt{UFiT}）的扩展，可根据结构化网格上定义的输入磁场计算磁力线滑移率。滑移率是一种局部的、基于物理的非理想演化诊断工具，能直接量化与理想冻结运动的偏离。我们概述了理论公式并描述了高效的数值实现。该方法通过解析解进行验证，并应用于采用三种处理不同空间尺度的日冕代码的模拟，这些模拟均为\ exttt{USlip}的标准输入。在所有考虑的示例中，滑移率不仅能识别磁连通性变化发生的位置，还能准确重现观测到的磁力线滑移方向。解析测试和多个模拟平台间结果的一致性表明，\ exttt{USlip}是用于诊断动态演化系统中三维重联的强大且通用的工具。
英文摘要：
We present the Universal Slippage calculator (\texttt{USlip}), an extension of the Universal Fieldline Tracer (\texttt{UFiT}), that computes magnetic field line slippage rates from an input magnetic field defined on a structured grid. The slippage rate provides a local, physically grounded diagnostic of non-ideal evolution, directly quantifying departures from ideal frozen-in motion. We outline the theoretical formulation and describe an efficient numerical implementation. The method is validated against analytical solutions and applied to simulations using three coronal codes treating varying spatial scales, all of which are standard inputs for \texttt{USlip}. In all the examples considered, the slippage rate not only identifies where magnetic connectivity changes occur, but also accurately reproduces the observed direction of field-line slippage. The consistency of the results across analytical tests and multiple simulation platforms demonstrates that \texttt{USlip} is a robust and versatile tool for diagnosing three-dimensional reconnection in dynamically evolving systems.
