Magnetic conjugacy of northern and southern auroral beads

Magnetic conjugacy of northern and southern auroral beads
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南北极光珠的磁耦合

DOI:
10.1029/2012gl051599
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发表时间:
2012
期刊:
Geophys. Res., Lett
影响因子:
--
通讯作者:
K. Hosokawa and N. Sato
K. Hosokawa and N. Sato
中科院分区:
--
文献类型:
--
作者:
Motoba;T.;A. Kadokura;K. Hosokawa and N. Sato

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极光珠,即,像珍珠项链一样的方位角排列的亮点,最近作为极光亚暴的可能前兆引起了人们的注意。我们使用来自地磁共轭冰岛-Syowa站对的同步地面全天空相机观测来证明,波长为30-50 km的极光珠在北方和南半球同步演变,并且具有显着的半球间相似性。在两个半球:结果表明:(1)它们几乎同时出现;(2)它们的纵波数近似为300-400,对应的珠距为经度的0.01 °;(3)它们同时开始向更大尺度的螺旋形发展;(4)它们的传播速度和时间演化几乎相同。这些半球间的相似性提供了强有力的证据,有一个共同的驱动程序在磁尾赤道区,控制主要的时间演变的极光珠,因此,磁层中起着主要的作用,在结构的初始增亮弧在这个规模的大小。
Auroral beads, i.e., azimuthally arrayed bright spots resembling a pearl necklace, have recently drawn attention as a possible precursor of auroral substorms. We used simultaneous, ground‐based, all‐sky camera observations from a geomagnetically conjugate Iceland‐Syowa Station pair to demonstrate that the auroral beads, whose wavelength is ∼30–50 km, evolve synchronously in the northern and southern hemispheres and have remarkable interhemispheric similarities. In both hemispheres: 1) they appeared almost at the same time; 2) their longitudinal wave number was similar ∼300–400, corresponding bead separation being ∼1° in longitude; 3) they started developing into a larger scale spiral form at the same time; 4) their propagation speeds and their temporal evolution were almost identical. These interhemispheric similarities provide strong evidence that there is a common driver in the magnetotail equatorial region that controls the major temporal evolution of the auroral beads; thus, the magnetosphere plays a primary role in structuring the initial brightening arc in this scale size.
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