Electric currents of a substorm current wedge on 24 February 2010
Electric currents of a substorm current wedge on 24 February 2010
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2010 年 2 月 24 日亚暴电流楔的电流
DOI：
10.1002/2014gl060604
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发表时间：
2014
影响因子：
5.2
通讯作者：
X. Chu
中科院分区：
文献类型：
--
作者：
M. Connors;R. McPherron;B. Anderson;H. Korth;C. Russell;X. Chu
三维“亚暴电流楔”(SCW)是由McPherron等人提出的假设。(1973)解释了亚暴磁扰动。然而，作为现代空间物理学这一重要范例的一个物理系统的起源和连贯性仍然不清楚，严重的抽样不足和数据反演的独特性问题阻碍了进展。作为安培(主动磁层和行星电动力学响应实验)空间派生的径向电流与地磁数据的补充，我们克服了福岛(1969,1994)确定的唯一性问题。对于2010年2月24日的亚风暴，我们从地面和空间数据一致地量化了SCW的发展。它向西的电喷流在极光椭圆形更偏北的部分携带0.5 MA，在跨越午夜的区域1(R1)意义上。晚间区域的电喷流也为其上行电流提供了能量。从而验证了SCW概念，并获得了定量研究亚暴所需的参数。
The three‐dimensional “substorm current wedge” (SCW) was postulated by McPherron et al. (1973) to explain substorm magnetic perturbations. The origin and coherence as a physical system of this important paradigm of modern space physics remained unclear, however, with progress hindered by gross undersampling, and uniqueness problems in data inversion. Complementing AMPERE (Active Magnetosphere and Planetary Electrodynamics Response Experiment) space‐derived radial electric currents with ground magnetic data allowing us to determine currents from the ionosphere up, we overcome problems of uniqueness identified by Fukushima (1969, 1994). For a substorm on 24 February 2010, we quantify SCW development consistently from ground and space data. Its westward electrojet carries 0.5 MA in the more poleward part of the auroral oval, in Region 1 (R1) sense spanning midnight. The evening sector electrojet also feeds into its upward current. We thus validate the SCW concept and obtain parameters needed for quantitative study of substorms.