太阳噪声风暴源参数相关演化的发现：微耀斑期间磁场动力学的见解
Discovery of correlated evolution in solar noise storm source parameters: Insights on magnetic field dynamics during a microflare
摘要：
太阳I型噪声暴是由活动区产生的加速粒子束经过磁场重组而产生的。它们的强度在亚秒和亚兆赫尺度内按数量级变化。但是，这些源的形态演变没有在这些尺度上进行研究，由于缺乏所需的成像节奏和保真度在米波段。利用Murchison宽场阵列（MWA）的数据，这项工作探讨了与弱微耀斑相关的噪声风暴源的大小，天空方向和强度的共同演化。这项工作提出了两个相关的源参数的演变模式的发现：香肠一样的\s \模式的源强度和大小显示反相关的演变;和扭转一样的\T \模式的源大小和天空方向显示相关的演变。耀斑介导的模式转换，观察到从\T \到\s \的第一次在这些来源。这些结果支持的想法，建立了磁应力能量的编织活动区环，后来去不稳定，导致耀斑和粒子加速，直到他们放松到最低限度的编织状态。所发现的模式转换可以是对这种活动区域现象的未来诊断。
英文摘要：
A solar type-I noise storm is produced by accelerated particle beams generated at active regions undergoing magnetic field restructuring. Their intensity varies by orders of magnitude within sub-second and sub-MHz scales. But, the morphological evolution of these sources are not studied at these scales, due to the lack of required imaging cadence and fidelity in metrewave bands. Using data from the Murchison Widefield Array (MWA), this work explores the co-evolution of size, sky-orientation and intensity of a noise storm source associated with a weak microflare. The work presents the discovery of two correlated modes of evolution in the source parameters: a sausage like \s\ mode where the source intensity and size shows an anti-correlated evolution; and a torsional like \T\ mode where the source size and sky-orientation shows a correlated evolution. A flare mediated mode conversion is observed from \T\ to \s\ for the first time in these sources. These results support the idea of build up of magnetic stress energy in braided active region loops, which later go unstable causing flares and particle acceleration until they relax to a minimally braided state. The discovered mode conversion can be a future diagnostic to such active region phenomena.
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