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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Asymmetry of solar polar fields and the southward shift of HCS observed by Ulysses
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Asymmetry of solar polar fields and the southward shift of HCS observed by Ulysses

机译：不对称的太阳能极地领域和向南转变的高碳钢观察尤利西斯

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摘要

We study the hemispheric asymmetry of high-latitude unipolar fields and the latitudinal shift of the heliospheric current sheet (HCS) using Ulysses magnetic field observations during the perihelion passes in 1994-1995, 2001-2002, and 2007. Using the cumulative flux density and the best fit lines to its high-latitude observations in the two hemispheres, we find that the absolute value of the high-latitude radial field of the Southern Hemisphere is larger than in the north during both minimum time scans in 1994-1995 and 2007. The hemispheric difference is about 0.2 nT during both scans, suggesting that the northern field area is some 5-10 (5-15) larger than the southern area and that the HCS is shifted southward by about -2° during both scans. The results resolve the discrepancy between earlier results in 1994-1995 and clarify similar observations in 2007 in the ecliptic. They also verify the southward shift of the HCS during the exceptional solar cycle 23. We also study the detailed structure of the equatorial region and find that generally the Ulysses observations compare favorably with simultaneous heliospheric magnetic field predictions given by Wilcox Solar Observatory synoptic maps. Using a simple HCS model, we find that even in case of southward shifted HCS, the highest peak of the cumulative flux density could be located above the equator. Thus, Ulysses observations around the heliographic equator cannot alone give an unambiguous information of the HCS shift, which emphasizes the importance of studying the high-latitude sections of Ulysses orbit.
机译：我们研究的半球不对称高纬度单极字段和纬向转变的日球电流片(高碳钢)使用尤利西斯磁场观测期间近日点通过1994 - 1995年,2001 - 2002,和2007年。最适合线高纬度地区观察在两个半球,我们发现高纬度径向的绝对值南半球大于领域在北方在最短时间扫描1994 - 1995年和2007年。约0.2元在扫描,说明北方场面积约5% -10% (5% - -15%)比南部地区,高碳钢移向南约2°两次扫描。解决差异的结果结果1994 - 1995年早些时候,明确相似观察2007年在黄道。验证中高碳钢的向南转移特殊的太阳周期23。赤道地区的详细结构发现一般尤利西斯观察优于同步日球Wilcox太阳磁场的预测天文台天气地图。模型中,我们发现,即使在向南移位的高碳钢,累积的最高峰通量密度可能是赤道上方的。因此,《尤利西斯》观察周围日面赤道不能单独给出高碳钢的明确信息转变,强调学习的重要性高纬度地区的部分尤利西斯轨道。

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