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Microwave imaging of quasi-periodic pulsations at flare current sheet View all abstracts by submitter

Xin Cheng   Submitted: 2022-12-15 02:52

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 1020 s and 3060 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.

Authors: Yuankun Kou, Xin Cheng, Yulei Wang, Sijie Yu, Bin Chen, Eduard P. Kontar & Mingde Ding
Projects: None

Publication Status: Nature Communications volume 13, Article number: 7680 (2022)
Last Modified: 2022-12-16 13:52
Go to main E-Print page  Numerical Simulations of Oscillations in Solar Corona Excited by Vortex Shedding  Interrogating Solar Flare Loop Models with IRIS Observations 2: Plasma Properties, Energy Transport, and Future Directions  Edit Entry  Download Preprint  Delete Entry 

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