Magnetopause reconnection across wide local time
Magnetopause reconnection across wide local time
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DOI：
10.5194/angeo-29-1683-2011
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发表时间：
2011-01-01
影响因子：
1.9
通讯作者：
Carr, C.
中科院分区：
文献类型：
--
作者：
Dunlop, M. W.;Zhang, Q. -H.;Carr, C.
2007年4月至7月期间，10个航天器组合在一起，在各种当地时间对昼侧磁层顶进行了同时监测。由四个相距很远（10 000公里）的星团航天器组成的阵列正在穿越高纬度和低纬度的黎明侧磁层顶;五个THEMIS航天器通常以4 + 1组合的方式穿越低纬度的黄昏侧磁层，双星星星TC-1航天器位于THEMIS和星团轨道当地时间之间的赤道轨道上。我们在这里展示了所有10个航天器在磁层顶几乎同时会合的情况。一个合取标识了一个扩展的磁重联X线，倾斜在低纬度，太阳下的区域，它与活动的反平行重联网站一起存在，延伸到黎明侧侧翼的位置。所有航天器上都观察到Oppensary移动FTE，与最初较强的IMF条件和航天器的黄昏和黎明的中午的比较位置一致。与其他连接的磁层顶交叉，这也分布在广泛的当地时间，支持的结果，重联活动可能会发生在许多网站同时在太阳下和侧翼磁层顶，但连接到大规模（扩展）配置的合并线，广泛依赖于IMF的方向。因此，MR的发生本质上遵循“组件”驱动的场景，而与引导场条件无关。一些关联可以观测到全球磁层顶对IMF变化的响应，航天器的分布可以同时直接确定当地中午、黎明和黄昏侧的形状、运动和变形。
During April to July 2007 a combination of 10 spacecraft provided simultaneous monitoring of the dayside magnetopause across a wide range of local times. The array of four Cluster spacecraft, separated at large distances (10 000 km), were traversing the dawn-side magnetopause at high and low latitudes; the five THEMIS spacecraft were often in a 4 + 1 grouped configuration, traversing the low latitude, dusk-side magnetosphere, and the Double star, TC-1 spacecraft was in an equatorial orbit between the local times of the THEMIS and Cluster orbits. We show here a number of near simultaneous conjunctions of all 10 spacecraft at the magnetopause. One conjunction identifies an extended magnetic reconnection X-line, tilted in the low latitude, sub-solar region, which exists together with active anti-parallel reconnection sites extending to locations on the dawn-side flank. Oppositely moving FTE's are observed on all spacecraft, consistent with the initially strong IMF By conditions and the comparative locations of the spacecraft both dusk-ward and dawn-ward of noon. Comparison with other conjunctions of magnetopause crossings, which are also distributed over wide local times, supports the result that reconnection activity may occur at many sites simultaneously across the sub-solar and flank magnetopause, but linked to the large scale (extended) configuration of the merging line; broadly depending on IMF orientation. The occurrence of MR therefore inherently follows a "component" driven scenario irrespective of the guide field conditions. Some conjunctions allow the global magnetopause response to IMF changes to be observed and the distribution of spacecraft can directly confirm its shape, motion and deformation at local noon, dawn and dusk-side, simultaneously.