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Chromospheric Recurrent Jets in a Sunspot Group and Their Intergranular Origin

Abstract : We report on high-resolution observations of recurrent fan-like jets by the Goode Solar Telescope in multiple wavelengths inside a sunspot group. The dynamics behavior of the jets is derived from the Hα line profiles. Quantitative values for one well-identified event have been obtained, showing a maximum projected velocity of 42 km s-1 and a Doppler shift of the order of 20 km s-1. The footpoints/roots of the jets have a lifted center on the Hα line profile compared to the quiet Sun, suggesting a long-lasting heating at these locations. The magnetic field between the small sunspots in the group shows a very high resolution pattern with parasitic polarities along the intergranular lanes accompanied by high-velocity converging flows (4 km s-1) in the photosphere. Magnetic cancellations between the opposite polarities are observed in the vicinity of the footpoints of the jets. Along the intergranular lanes horizontal magnetic field around 1000 G is generated impulsively. Overall, all the kinetic features at the different layers through the photosphere and chromosphere favor a convection-driven reconnection scenario for the recurrent fan-like jets and evidence a site of reconnection between the photosphere and chromosphere corresponding to the intergranular lanes.
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Submitted on : Monday, July 4, 2022 - 3:46:42 PM
Last modification on : Friday, August 5, 2022 - 12:00:56 PM

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Jie Zhao, Jiangtao Su, Xu Yang, Hui Li, Brigitte Schmieder, et al.. Chromospheric Recurrent Jets in a Sunspot Group and Their Intergranular Origin. The Astrophysical Journal, 2022, 932, ⟨10.3847/1538-4357/ac6e3b⟩. ⟨insu-03713300⟩

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