根据LASCO观测对日冕物质抛射驱动激波的定量测量
Quantitative Measurements of CME-driven Shocks from LASCO Observations
摘要：
在本文中，我们证明了CME驱动的冲击可以检测到白光日冕图像，并在其中的属性，如密度压缩比和冲击方向可以测量。此外，它们的传播方向可以通过简单的建模来推导。我们专注于日冕物质抛射在上升阶段的太阳活动周期23时，大规模的日冕形态是简单的。我们选择的事件是很好的候选人，以驱动一个冲击，因为他们的高速度（V>1500公里/秒）。最终名单包括15个CME。对于每个事件，我们校准LASCO数据，构建过量质量图像，并在明亮的CME前沿之前寻找微弱和相对尖锐的前沿迹象。我们在86%（13/15）的事件中发现了这种特征，并测量了上游/下游密度以估计冲击强度。我们的值与理论预期一致，并显示出良好的相关性与CME的动能和动量。最后，我们使用一个简单的正演模拟技术来估计白光冲击特征的三维形状和方向。我们发现与观测到的密度分布和CME源区的位置非常吻合。我们的研究结果强烈表明，所观察到的亮度增强的结果，由于由CME驱动的弓激波结构的密度增强。
英文摘要：
In this paper, we demonstrate that CME-driven shocks can be detected in white light coronagraph images and in which properties such as the density compression ratio and shock direction can be measured. Also, their propagation direction can be deduced via simple modeling. We focused on CMEs during the ascending phase of solar cycle 23 when the large-scale morphology of the corona was simple. We selected events which were good candidates to drive a shock due to their high speeds (V>1500 km/s). The final list includes 15 CMEs. For each event, we calibrated the LASCO data, constructed excess mass images and searched for indications of faint and relatively sharp fronts ahead of the bright CME front. We found such signatures in 86% (13/15) of the events and measured the upstream/downstream densities to estimate the shock strength. Our values are in agreement with theoretical expectations and show good correlations with the CME kinetic energy and momentum. Finally, we used a simple forward modeling technique to estimate the 3D shape and orientation of the white light shock features. We found excellent agreement with the observed density profiles and the locations of the CME source regions. Our results strongly suggest that the observed brightness enhancements result from density enhancements due to a bow-shock structure driven by the CME.
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