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Solar Ultraviolet Bursts in the Joint Footpoints of Multiple Transition Region Loops

Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, China
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Academic Editor: Eugene Oks
Symmetry 2021, 13(8), 1390; https://doi.org/10.3390/sym13081390
Received: 27 June 2021 / Revised: 21 July 2021 / Accepted: 27 July 2021 / Published: 31 July 2021
(This article belongs to the Special Issue Solar Physics and Plasma Physics: Topics and Advances)
Solar Ultraviolet bursts (UBs) associated with flux emergence are expected to help understand the physical processes of the flux emergence itself. In the present study, we analyse imaging and spectroscopic observations of a special group of UBs (including twelve of them) occurring in the joint footpoint regions of multiple transition region loops above the flux emerging regions. Consistent with previous studies of common UBs, we found that the spectral characteristics of this group of UBs are varied. Our results show that the responses of UBs in Ni ii, NUV continuum, Mg ii h and O i are originated from locations differ from that emits Si iv. The imaging data show that UBs have connections with the dynamics in the transition region loops. Brightenings starting from UB-regions and propagating along loops can be seen in SJ 1400/1330 Å and AIA 304 Å images and the corresponding time-space images. The apparent velocities are tens of kilometers per second in AIA 304 Å. For symmetry, the brightenings can propagate from the UB-regions towards opposite directions with similar apparent velocities in some cases. Given that these UBs are magnetic reconnection phenomena, we suggest that the propagating brightenings are the signals of the plasma flows resulted from heatings in the UB-regions. View Full-Text
Keywords: sun: atmosphere; sun: chromosphere; sun: transition region; sun: uv radiation; methods: observational sun: atmosphere; sun: chromosphere; sun: transition region; sun: uv radiation; methods: observational
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MDPI and ACS Style

Hou, Z.; Huang, Z.; Xia, L.; Fu, H.; Qi, Y.; Liu, D.; Tang, N. Solar Ultraviolet Bursts in the Joint Footpoints of Multiple Transition Region Loops. Symmetry 2021, 13, 1390. https://doi.org/10.3390/sym13081390

AMA Style

Hou Z, Huang Z, Xia L, Fu H, Qi Y, Liu D, Tang N. Solar Ultraviolet Bursts in the Joint Footpoints of Multiple Transition Region Loops. Symmetry. 2021; 13(8):1390. https://doi.org/10.3390/sym13081390

Chicago/Turabian Style

Hou, Zhenyong, Zhenghua Huang, Lidong Xia, Hui Fu, Youqian Qi, Dayang Liu, and Ning Tang. 2021. "Solar Ultraviolet Bursts in the Joint Footpoints of Multiple Transition Region Loops" Symmetry 13, no. 8: 1390. https://doi.org/10.3390/sym13081390

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