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An Automated Algorithm for Identifying and Tracking Transverse Waves in Solar Images

机译:一种自动识别和跟踪太阳图像中横波的算法

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Recent instrumentation has demonstrated that the solar atmosphere supports omnipresent transverse waves, which could play a key role in energizing the solar corona. Large-scale studies are required in order to build up an understanding of the general properties of these transverse waves. To help facilitate this, we present an automated algorithm for identifying and tracking features in solar images and extracting the wave properties of any observed transverse oscillations. We test and calibrate our algorithm using a set of synthetic data, which includes noise and rotational effects. The results indicate an accuracy of 1%–2% for displacement amplitudes and 4%–10% for wave periods and velocity amplitudes. We also apply the algorithm to data from the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory and find good agreement with previous studies. Of note, we find that 35%–41% of the observed plumes exhibit multiple wave signatures, which indicates either the superposition of waves or multiple independent wave packets observed at different times within a single structure. The automated methods described in this paper represent a significant improvement on the speed and quality of direct measurements of transverse waves within the solar atmosphere. This algorithm unlocks a wide range of statistical studies that were previously impractical.
机译:最近的仪器显示,太阳大气层支持无处不在的横波,这可能在激发日冕中起关键作用。为了建立对这些横波的一般特性的理解,需要进行大规模研究。为了帮助实现这一点,我们提出了一种自动算法,用于识别和跟踪太阳图像中的特征并提取任何观察到的横向振荡的波特性。我们使用一组综合数据(包括噪声和旋转效应)测试和校准算法。结果表明,位移幅度的精度为1%–2%,波浪周期和速度幅度的精度为4%–10%。我们还将算法应用于太阳动力学天文台的大气成像组件的数据,并与先前的研究发现了很好的一致性。值得注意的是,我们发现观察到的羽流中有35%–41%具有多重波浪特征,这表明波浪的叠加或在单个结构中在不同时间观察到的多个独立波浪包。本文所述的自动方法代表了对太阳大气内横波直接测量的速度和质量的重大改进。此算法可以解锁以前不切实际的大量统计研究。

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