论文标题
比较两种计算太阳电晕中磁性螺旋性的方法
Comparison of Two Methods for Calculating Magnetic Helicity in the Solar Corona
论文作者
论文摘要
二人组合大型磁性雷诺数，源自太阳内部的磁性螺旋性可以通过光球传递到电晕。然而，尚不清楚累积的磁性螺旋通量通过光球与磁性螺旋性之间的关系尚不清楚。通过在第23个太阳周期中选择36个新出现的活跃区域，我们使用光流方法通过使用顺序纵向磁力图通过Photosphere（$ h_m^p $）来得出累积的磁性螺旋，并使用顺序的纵向磁力图，使用非线性的无线磁场外推，以获得3D冠状磁场，并采用3D冠状磁场，并实现有限的磁场，并实现相对的磁场，并计算出计算的方法。 （$ h_m^c $）通过使用矢量磁图。 It is found that the local correlation tracking (LCT)-based $H_m^p$ is larger than $H_m^c$ in $1"$, and that the Differential Affine Velocity Estimator-based $H_m^p$ is more consistent with $H_m^c$ than the LCT-based $H_m^p$. $H_m^p$ is more consistent with $H_m^c$ in evaluation from $2"$ than from $ 1“ $。此外，$ h_m^c -h_m^p $系统地表现出与半球螺旋性规则（超过55 \％）的一致性，无论使用哪种分辨率和方法。这些估计表明，$ h_m^c $和$ h_m^p $的一致性部分依赖于大量方法和计算方法的分辨率。
Duo to the large magnetic Reynolds number, the magnetic helicity originating from the solar interior can be carried away through the photosphere into the corona. However, the relationship between the accumulated magnetic helicity flux through the photosphere and the magnetic helicity in the corona is still unclear. By selecting 36 newly emerging active regions in the 23rd solar cycle, we apply optical flow methods to derive the accumulated magnetic helicity through the photosphere ($H_m^p$) by using the sequential longitudinal magnetograms, use nonlinear force-free field extrapolation to obtain the 3D coronal magnetic field, and adopt finite volume methods to calculate the instantaneous relative magnetic helicity in the corona ($H_m^c$) by using vector magnetograms. It is found that the local correlation tracking (LCT)-based $H_m^p$ is larger than $H_m^c$ in $1"$, and that the Differential Affine Velocity Estimator-based $H_m^p$ is more consistent with $H_m^c$ than the LCT-based $H_m^p$. $H_m^p$ is more consistent with $H_m^c$ in evaluation from $2"$ than from $1"$. Moreover, $H_m^c - H_m^p$ systematically shows consistency with the Hemispheric Helicity Rule (over 55\%), no matter which resolution and method are used. These estimations suggest that the consistency of $H_m^c$ and $H_m^p$ is partly dependent on the resolution of the magnetograms and the calculation methods.
