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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >On the interplanetary magnetic field By control of substorm bulge expansion
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On the interplanetary magnetic field By control of substorm bulge expansion

机译：行星际磁场的控制亚暴膨胀扩张

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We investigate the azimuthal expansion/motion of auroral bulges in 27 large substorms using global auroral images acquired from the ultraviolet imager on board the Polar spacecraft. The region of each auroral bulge is first isolated using a region-growing image processing technique and the location of the auroral bulge is calculated and represented by its luminosity centroid position. It is found that eastward moving auroral bulges are as common as westward moving ones during the substorm expansion phase for the events studied. To exploit the possible cause of the east-west auroral bulge motion, we further correlate the azimuthal velocity of the auroral bulges with the dawn-dusk component (y-component in geocentric solar magnetic coordinates) of propagated interplanetary magnetic field (IMF) data from the Wind spacecraft. It is found that the centroid of the bulges during the expansion phase tends to move in the same direction as the y-component of IMF. We suggest that the asymmetry in the global magnetospheric/ionospheric convection associated with a nonzero value of IMF B y may be the cause of the azimuthal motion of auroral bulge.
机译：我们调查的方位/扩张运动使用全球极光凸起在27个,大亚暴极光图像获得的紫外线成像仪极地飞船。每个极光的膨胀首先是孤立的使用和区域增长图像处理技术极光凸起的位置和计算由其光度质心的位置。发现向东移动的极光凸起向西移动一样普遍的在吗研究了亚暴扩张阶段的事件。利用东西方的可能原因极光膨胀运动,我们进一步联系方位的极光膨胀速度在地心dawn-dusk组件(分量太阳磁场坐标)的传播行星际磁场(IMF)的数据风飞船。在扩张阶段倾向于凸起朝着同一个方向的分量国际货币基金组织(IMF)。磁层、电离层对流有关与一个非零值的货币基金组织B y可能会造成极光的方位运动隆起。

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