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- W2952367385 abstract "Abstract The emergence of active regions (ARs) leads to various dynamic activities. Using high-resolution and long-lasting H α observations from the New Vacuum Solar Telescope, we report the dynamics of NOAA AR 12700 in its emerging phase on 2018 February 26 in detail. In this AR, constant interchange reconnections (IRs) between emerging fibrils and preexisting ones were detected. Driven by the flux emergence, small-scale fibrils observed in H α wavelength continuously emerged at the center of the AR and reconnected with the ambient preexisting fibrils, forming new longer fibrils. We investigate three IR scenarios that occurred over two hours. Specially, the third scenario of reconnection resulted in the formation of longer fibrils that show pronounced rotation motion. To derive the evolution of the magnetic structure during the reconnections, we perform nonlinear force-free field extrapolations. The extrapolated three-dimensional magnetic fields clearly depict a set of almost potential emerging loops, two preexisting flux ropes at 03:00 UT before the second reconnection scenario, and a set of newly formed loops with less twist at 03:48 UT after the third reconnection scenario. All of these extrapolated structures are consistent with the fibrils detected at the H α wavelength. The aforementioned observations and extrapolation results suggest that the constant IRs resulted in the magnetic twist being redistributed from preexisting flux ropes toward the newly formed system with longer magnetic structure and weaker twist." @default.
- W2952367385 created "2019-06-27" @default.
- W2952367385 creator A5033343897 @default.
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- W2952367385 date "2019-05-01" @default.
- W2952367385 modified "2023-09-24" @default.
- W2952367385 title "The Dynamics of AR 12700 in Its Early Emerging Phase. I. Interchange Reconnection" @default.
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- W2952367385 doi "https://doi.org/10.3847/1538-4357/ab1083" @default.
- W2952367385 hasPublicationYear "2019" @default.
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