Submerged Sources of Transient Acoustic Emission from Solar Flares
Submerged Sources of Transient Acoustic Emission from Solar Flares
复制标题
太阳耀斑瞬态声发射的水下源
DOI：
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发表时间：
2020
影响因子：
7.9
通讯作者：
A. Donea
中科院分区：
文献类型：
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作者：
C. Lindsey;J. Buitrago;J. M. Martínez Oliveros;D. Braun;Angel D. Martínez;Valeria Quintero Ortega;B. Calvo;A. Donea
我们报告的超脉冲声发射的发现，从太阳耀斑，发射与地震签名，表明其源大约一毫米以下的活动区域，举办耀斑的光球淹没。就在二十多年前，V.V. G.赫维切夫发现了第一个由太阳耀斑释放到太阳内部的声学瞬变。这些声波在释放后向上折射到太阳表面，形成明显的多普勒波纹，从耀斑区域向外传播，告诉我们很多关于它们的来源。驱动这些瞬变的机制一直顽固地逃避我们的理解。例如，一些震源区域在震源区域的外部大气中没有次级多普勒、磁或热扰动，这些扰动将表示外部大气中强烈地震瞬变的驱动因素。在这项研究中，我们应用日震全息，诊断基于标准波光学，重建的3D图像的声波源发出的M9.3级耀斑的2011年7月30日。这些图像包含一个源组件，它被淹没在活动区光球下面一个完整的Mm。在太阳内部如此深处的声源的特征为耀斑产生的瞬态声发射的物理学以及可能的耀斑物理学开辟了新的思路。我们开发的类比地震活动远程触发的震动从遥远的地震，并考虑新的洞察力的架构下耀斑活动区的磁通量的前景。
We report the discovery of ultra-impulsive acoustic emission from a solar flare, emission with a seismic signature that indicates submersion of its source approximately a Mm beneath the photosphere of the active region that hosted the flare. Just over two decades ago V. V. Zharkova and A. G. Kosovichev discovered the first acoustic transient released into the Sun’s interior by a solar flare. These acoustic waves, refracted back upward to the solar surface after their release, make conspicuous Doppler ripples spreading outward from the flaring region that tell us a lot about their sources. The mechanism by which these transients are driven has stubbornly eluded our understanding. Some of the source regions, for example, are devoid of secondary Doppler, magnetic, or thermal disturbances in the outer atmosphere of the source regions that would signify the driving agent of an intense seismic transient in the outer atmosphere. In this study, we have applied helioseismic holography, a diagnostic based upon standard wave optics, to reconstruct a 3D image of the sources of acoustic waves emanating from the M9.3-class flare of 2011 July 30. These images contain a source component that is submerged a full Mm beneath the active-region photosphere. The signature of acoustic sources this deep in the solar interior opens new considerations into the physics that must be involved in transient acoustic emission from flares—and possibly of flare physics at large. We develop analogies to seismicity remotely triggered by tremors from distant earthquakes, and consider prospects of new insight into the architecture of magnetic flux beneath flaring active regions.