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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Prediction and understanding of the north-south displacement of the heliospheric current sheet
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Prediction and understanding of the north-south displacement of the heliospheric current sheet

机译：预测和了解日球电流片的南北向位移

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摘要

On the basis of Wilcox Solar Observatory observations of the photospheric magnetic field and the potential field-source surface model, we compare the solid angles occupied by the positive source surface field with that of the negative. We develop an algorithm to quantitatively estimate and understand the positive-negative displacement of the heliospheric current sheet (HCS) about Sun's magnetic dipole equator and the north-south displacement of the HCS about the heliographic equator. The north-south HCS displacement predicted using the algorithm quantitatively agrees with that observed by Ulysses and Wind in 1994–1995. The predicted positive-negative and north-south HCS displacement for 362 Carrington rotations between 1976 and 2001 show that in addition to the two long southward HCS displacement intervals that are consistent with earlier observations and statistical results, there are several short north-south HCS displacement intervals in the rising and early declining solar activity phases. All the positive-negative HCS displacements about the Sun's magnetic dipole equator determined for the 25 years can be understood using the positive-negative asymmetry in the characteristics of coronal holes or open field regions between two hemispheres, such as the area, field strength, or the outward expansion factor of the coronal holes. To understand the north-south HCS displacement about the heliographic equator, the effect of the Sun's magnetic dipole tilt angle relative to the Sun's rotation axis must be taken into consideration as well.
机译：基于Wilcox太阳观测站对光球磁场的观测和势场-源面模型，我们比较了正源面场和负源面场所占据的立体角。我们开发了一种算法，用于定量估计和了解太阳磁偶极赤道的日球电流表（HCS）的正负位移以及关于太阳赤道赤道的HCS的南北位移。使用该算法预测的南北向HCS位移定量地与Ulysses和Wind在1994–1995年观察到的位移一致。 1976年至2001年之间362次Carrington旋转所预测的HCS正负和北-南HCS位移显示，除了与早先的观测和统计结果一致的两个较长的南向HCS位移区间外，还有一些短的南北HCS位移太阳活动阶段上升和早期下降的时间间隔。可以使用两个半球之间的日冕孔或空场区域的特征（例如面积，磁场强度或磁场）的正负不对称性，来了解在25年内确定的有关太阳磁偶极赤道的所有HCS正负HCS位移。冠状孔的向外膨胀因子。为了了解关于赤道赤道的南北向HCS位移，还必须考虑太阳磁偶极子相对于太阳旋转轴的倾斜角的影响。

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