摘要
Prominence plumes are evacuated upflows that emerge from bubbles below prominences,whose formation mechanism is still unclear.Here we present a detailed study of plumes in a quiescent prominence using the high-resolution Hαfiltergrams at the line center as well as line wing at±0.4 A from the New Vacuum Solar Telescope.Enhancements of brightening,blue shifts,and turbulence at the fronts of plumes are found during their formation.Some large plumes split at their heads and finger-shaped structures are formed between them.Blue-shifted flows along the bubble-prominence interface are found before and during the plume formation.Our observations are consistent with the hypothesis that prominence plumes are related to coupled Kelvin-Helmholtz and Rayleigh-Taylor(KH/RT)instabilities.Plume splittings and fingers are evidence of RT instability,and the flows may increase the growth rate of KH/RT instabilities.However,the significant turbulence at plume fronts may suggest that the RT instability is triggered by the plumes penetrating into the prominence.In this scenario,extra mechanisms are necessary to drive the plumes.
作者
薛建朝
Jean-Claude Vial
Yang Su
Hui Li
Zhi Xu
Ying-Na Su
Tuan-Hui Zhou
Zhen-Tong Li
Jian-Chao Xue;Jean-Claude Vial;Yang Su;Hui Li;Zhi Xu;Ying-Na Su;Tuan-Hui Zhou;Zhen-Tong Li(Key Laboratory of Dark Matter and Space Astronomy,Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China;School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026,China;Institut d'strophysique Spatiale,CNRS/UniversitéParis-Sud,UniversitéParis-Saclay,Bâtiment 121,91405 Orsay Cedex,France;Yunnan Observatories,Chinese Academy of Sciences,Kunming 650216,China)
基金
supported by the National Natural Science Foundation of China(NSFC,Grant Nos.11427803,U1731241,U1631242 and 11820101002)
by CAS Strategic Pioneer Program on Space Science(Grant Nos.XDA15052200,XDA15320103,XDA15320300 and XDA15320301)
the Jiangsu Double Innovation Plan
NSFC(Grant No.11873091)
Yunnan Province Basic Research Plan(No.2019FA001)。