Reconfiguration timescales of ionospheric convection
Reconfiguration timescales of ionospheric convection
复制标题
电离层对流的重构时标
DOI：
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复制
发表时间：
2001
期刊：
影响因子：
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通讯作者：
W. Hughes
中科院分区：
文献类型：
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作者：
D. Murr;W. Hughes
电离层流动模式的变化提供了磁层-电离层系统如何与IMF耦合的直接观测。磁层顶重联的性质和位置被传送到电离层，电离层通过重新配置全球对流模式作出反应。我们调查的动态变化的全球电离层对流模式使用一个大的二维阵列的地面磁力计。我们已经发现，对于IMF的急剧北向南过渡，日侧电离层对流模式在全球范围内重新配置自己的时间尺度短至8分钟。我们发现，所有的本地时间最初都在电离层中第一个可检测到的响应的1 - 2分钟内响应。测量电离层从其初始状态过渡到其新状态所需的时间长度（初始开始后），我们称之为重新配置时间。IMF Bz向北到向南的过渡在当地中午附近有大约5分钟的重新配置时间，并且在距离中午的当地时间每3小时延长大约2分钟。
Changes in ionospheric flow patterns provide direct observations of how the magnetosphere‐ionosphere system is coupled to the IMF. The nature and location of reconnection on the magnetopause is communicated to the ionosphere, which responds by reconfiguring global convection patterns. We investigate the dynamics of the changing global ionospheric convection patterns using a large two‐dimensional array of ground magnetometers. We have found that for sharp north to south transitions of the IMF, dayside ionospheric convection patterns globally reconfigure themselves in timescales as short as 8 minutes. We find that all local times initially respond within 1‐2 minutes of the first detectable response in the ionosphere. The length of time (after the initial onset) required for the ionosphere to transition from its initial state to its new state, which we refer to as the reconfiguration time, is measured. IMF Bz northward to southward transitions have reconfiguration times near local noon of approximately 5 minutes and lengthen approximately 2 minutes for every 3 hours of local time away from noon.