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arXiv 2303.08663astro-ph.SR
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日冕物质抛射激波运动学演化的参数化研究及其与耀斑活动的关系

Parametric study of the kinematic evolution of coronal mass ejection shock waves and their relation to flaring activity

Manon Jarry, Alexis P. Rouillard, Illya Plotnikov, Athanasios Kouloumvakos, Alexander Warmuth

AI总结:

本文基于SDO、SoHO和STEREO的多视角成像数据,对32个CME激波进行椭球几何重建和运动学参数化分析,研究其三维演化规律、投影效应及与相关耀斑软硬X射线活动的关系。

摘要:

日冕物质抛射(CMEs)产生的日冕和行星际激波是空间天气现象的主要驱动因素,会引起日光层辐射环境的重大变化,并直接扰动近地环境,包括其磁层。因此,更好地理解这些激波如何从日冕演化到行星际介质,有助于改进空间天气的临近预报和预报。这些激波的早期预警可以来自射电测量以及日冕仪观测,这些观测可用于表征这些结构的动力学演化。我们的目标是分析由太阳动力学天文台(SDO)、太阳和日光层天文台(SoHO)以及日地关系天文台(STEREO)获取的多点白光和紫外图像所导出的32个CME激波的几何学和运动学特性,以增进我们对CME爆发期间激波如何在三维空间中演化的理解。我们利用我们的目录来搜索激波的运动学特性与作为CME活塞底层起源的耀斑活动之间的关系。过去的研究表明,从多个观测视角观测到的激波可以用简单的椭球体在几何上恰当地再现。重建的激波目录提供了这些椭球参数随时间变化的演化。从这些参数中,我们推导出激波随时间演化的侧向和径向膨胀速度。我们将这些运动学特性与SoHO从单一视角获得的特性进行比较,以评估投影效应。最后,当相关耀斑在日面上被观测到时,我们通过考虑软X射线和硬X射线的测量来考察激波与相关耀斑之间的关系。

英文摘要:

Coronal and interplanetary shock waves produced by coronal mass ejections (CMEs) are major drivers of space-weather phenomena, inducing major changes in the heliospheric radiation environment and directly perturbing the near-Earth environment, including its magnetosphere. A better understanding of how these shock waves evolve from the corona to the interplanetary medium can therefore contribute to improving nowcasting and forecasting of space weather. Early warnings from these shock waves can come from radio measurements as well as coronagraphic observations that can be exploited to characterise the dynamical evolution of these structures. Our aim is to analyse the geometrical and kinematic properties of 32 CME shock waves derived from multi-point white-light and ultraviolet imagery taken by the Solar Dynamics Observatory (SDO), Solar and Heliospheric Observatory (SoHO), and Solar-Terrestrial Relations Observatory (STEREO) to improve our understanding of how shock waves evolve in 3D during the eruption of a CME. We use our catalogue to search for relations between the shock wave's kinematic properties and the flaring activity associated with the underlying genesis of the CME piston. Past studies have shown that shock waves observed from multiple vantage points can be aptly reproduced geometrically by simple ellipsoids. The catalogue of reconstructed shock waves provides the time-dependent evolution of these ellipsoidal parameters. From these parameters, we deduced the lateral and radial expansion speeds of the shocks evolving over time. We compared these kinematic properties with those obtained from a single viewpoint by SoHO in order to evaluate projection effects. Finally, we examined the relationships between the shock wave and the associated flare when the latter was observed on the disc by considering the measurements of soft and hard X-rays.

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