论文标题
耀斑电流纸的准周期脉动的微波成像
Microwave Imaging of Quasi-periodic Pulsations at Flare Current Sheet
论文作者
论文摘要
准周期性脉动（QPP）经常在太阳和恒星耀斑中检测到，但仍有潜在的物理机制可以确定。在这里，我们在太阳耀斑期间显示了微波炉QPP，该太阳耀斑起源于耀斑电流板上的准周期磁重新连接。它们显示为两个垂直分离但密切相关的来源，较亮的源位于耀斑环，沿拉伸电流纸较弱的来源。尽管两个微波源的亮度温度有很大差异，但它们的期间差异约为10--20 s和30--60 s。陀螺仪的微波光谱也呈现出准周期性软柔软的演变。这些结果表明，相关的高能电子通过准周期重新连接加速，这可能是由于当前纸内的磁岛调节而产生的，该磁岛通过2.5维磁性水力学模拟验证。
Quasi-periodic pulsations (QPPs) are frequently detected in solar and stellar flares, but the underlying physical mechanisms are still to be ascertained. Here, we show microwave QPPs during a solar flare originating from quasi-periodic magnetic reconnection at the flare current sheet. They appear as two vertically detached but closely related sources with the brighter ones located at flare loops and the weaker ones along the stretched current sheet. Although the brightness temperatures of the two microwave sources differ greatly, they vary in phase with periods of about 10--20 s and 30--60 s. The gyrosynchrotron-dominated microwave spectra also present a quasi-periodic soft-hard-soft evolution. These results suggest that relevant high-energy electrons are accelerated by quasi-periodic reconnection, likely arising from the modulation of magnetic islands within the current sheet as validated by a 2.5-dimensional magnetohydrodynamic simulation.
