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arXiv 0802.1971astro-ph
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利用自动边缘跟踪算法发现日冕环的空间周期性

Discovery of Spatial Periodicities in a Coronal Loop using Automated Edge-Tracking Algorithms

D. B. Jess, M. Mathioudakis, R. Erdelyi, G. Verth, R. T. J. McAteer, F. P. Keenan

摘要:

提出了一种新的自动冠状环跟踪方法,在空间和时间域。将这种技术应用于1998年7月14日使用171埃滤波器获得的TRACE数据,我们检测到一个经历270秒扭结模式振荡的日冕环,正如Aschwanden等人(1999)以前发现的那样。然而,我们也检测到耀斑引起的,以前没有注意到的,空间周期性的规模为3500公里,这发生在沿冠环边缘。此外,我们建立了一个减少这些空间周期性的振荡功率超过222秒的间隔为45%。我们将检测到的振荡功率的减少与这些环顶振荡的物理阻尼相关联。

英文摘要:

A new method for automated coronal loop tracking, in both spatial and temporal domains, is presented. Applying this technique to TRACE data, obtained using the 171 Angstrom filter on 1998 July 14, we detect a coronal loop undergoing a 270s kink-mode oscillation, as previously found by Aschwanden et al. (1999). However, we also detect flare-induced, and previously unnoticed, spatial periodicities on a scale of 3500km, which occur along the coronal-loop edge. Furthermore, we establish a reduction in oscillatory power for these spatial periodicities of 45% over a 222s interval. We relate the reduction in detected oscillatory power to the physical damping of these loop-top oscillations.

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