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首页> 外文期刊>The Astrophysical journal >THE LOCAL HELIOSEISMOLOGY OF INCLINED MAGNETIC FIELDS AND THE SHOWERGLASS EFFECT
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THE LOCAL HELIOSEISMOLOGY OF INCLINED MAGNETIC FIELDS AND THE SHOWERGLASS EFFECT

机译：倾斜磁场的局部流变学和玻璃幕效应

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摘要

We present evidence for the dependence of helioseismic Doppler signatures in active regions on the line-of-sight angle in inclined magnetic fields. Using data from the Michelson Doppler Imager (MDI) on board the Solar and Heliospheric Observatory, we performed phase-sensitive holography in the penumbrae of sunspots over the course of several days as the spots traversed the solar disk. Control correlations, which comprise a correlation of the surface wave amplitude with the incoming acoustic wave amplitude from a surrounding region, were mapped. There is a direct dependence of control-correlation phase signatures on the line-of-sight angle in the plane defined by the vertical and magnetic field vectors. The phase shift of waves observed along directions close to the orientation of the magnetic field is smaller than the phase shift observed when the line of sight is at a significant angle with respect to the field orientation. These findings have important implications for local helioseismology. The variation in phase shift (or the equivalent acoustic travel-time perturbations) with line-of-sight direction suggests that a substantial portion of the phase shift occurs in the photospheric magnetic field. Observations of the vector components of the field may be used to develop a proxy to correct these phase perturbations (known as the acoustic showerglass) that introduce uncertainties in the signatures of acoustic perturbations below the surface.
机译：我们提供了倾斜区域中视线角上活动区域中的地震地震多普勒信号的依赖性的证据。利用太阳和日球天文台上的迈克尔逊多普勒成像仪（MDI）的数据，我们在太阳黑子的半影上经过了几天的过程，对它们进行了相敏感的全息照相，因为这些黑点穿过了太阳盘。绘制了控制相关性，其中包括表面波幅度与从周围区域传入的声波幅度的相关性。控制相关相位签名直接依赖于由垂直矢量和磁场矢量定义的平面中的视线角。沿接近磁场方向的方向观察到的波的相移小于视线相对于磁场方向成显着角度时观察到的相移。这些发现对当地的地震学具有重要意义。相移（或等效的声波传播时间扰动）随视线方向的变化表明，相移的大部分发生在光球磁场中。对该场的矢量分量的观察可用于开发代理来校正这些相位扰动（称为声淋浴玻璃），这些相位扰动会在表面以下的声扰动特征中引入不确定性。

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