On the location of auroral arcs near substorm onsets
On the location of auroral arcs near substorm onsets
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关于亚暴爆发附近极光弧的位置
DOI：
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发表时间：
1978
期刊：
影响因子：
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通讯作者：
J. Burrows
中科院分区：
文献类型：
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作者：
A. Lui;J. Burrows
两个偶然的极地通行证的伊希斯2号卫星被用来检查极光弧的位置亚暴爆发附近的低空磁层等离子体边界。在一个案例中，极光弧在通过期间的亚暴开始时变亮。在另一种情况下，卫星在其变亮之后，但就在其向极扩张之前通过了弧。在这两种情况下，电弧都位于Winningham等人[1975]定义的中心等离子体层和边界等离子体层之间的过渡区附近。电弧位置也接近持久捕获的高能电子（E> 40 keV）的极向终端。因此，这些观察结果表明，亚暴触发过程发生在闭合的磁场线以及等离子体片的内外边缘。
Two fortuitous polar passes of the Isis 2 satellite are used to examine the location of auroral arcs near substorm onsets in relation to the low-altitude magnetospheric plasma boundaries. In one case the auroral arc was brightening at substorm onset during the pass. In the other case the satellite passed the arc after its brightening but just prior to its poleward expansion. In both cases the arcs are situated near the transition between the central plasma layer and the boundary plasma layer as defined by Winningham et al. [1975]. The arc location was also near the poleward termination of the durably trapped energetic electrons (E > 40 keV). Thus these observations suggest that the substorm triggering process occurs on closed magnetic field lines well within the outer and inner edges of the plasma sheet.