INVESTIGATION OF THICKNESS AND ELECTRICAL RESISTIVITY OF THE CURRENT SHEETS IN SOLAR ERUPTIONS
INVESTIGATION OF THICKNESS AND ELECTRICAL RESISTIVITY OF THE CURRENT SHEETS IN SOLAR ERUPTIONS
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DOI：
10.1088/0004-637x/693/2/1666
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发表时间：
2009-03
期刊：
影响因子：
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通讯作者：
J. Lin;J. Li;Y. Ko;J. Raymond
中科院分区：
文献类型：
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作者：
J. Lin;J. Li;Y. Ko;J. Raymond
在2007年，林等人对太阳爆发时电流片厚度d的讨论导致了有效电阻率ηe的估算值非常大。在此，我们讨论该文件提出的一些问题。我们应用临边天气图技术，发现d在5.0 × 104和4.6 × 105 km之间，随时间和高度增加。研究了由投影效应引起的大视d和ηe的可能性，并排除了这种可能性。我们推导出与d和其他观测量相关的理论标度律，这些标度律证实了这一结论，从而有助于将d和ηe限制在合理的范围内。我们的研究结果可能对现有的模型的粒子加速重联电流片的影响也进行了简要的讨论。
A discussion of the thickness of current sheets in solar eruptions, d, led Lin et al. in 2007 to estimate very large values for the effective resistivity, ηe. Here, we address some questions raised by that paper. We apply the limb synoptic map technique and find d between 5.0 × 104 and 4.6 × 105 km, increasing with both time and altitude. The possibility that large apparent d and ηe result from projection effects is examined and rejected. We derive theoretical scaling laws relating d to other observables that corroborate this conclusion and thus help confine both d and ηe to a reasonable range. The possible impact of our results on the existing models of particle acceleration in reconnecting current sheets is also briefly discussed.