MHD Seismology of a loop-like filament tube by observed kink waves

作     者：Vaibhav Pant Abhishek K Srivastava Dipankar Banerjee Marcel Goossens Peng-Fei Chen Navin Chandra Joshi Yu-Hao Zhou 

作者机构：Indian Institute of Astrophysics Department of PhysicsIndian Institute of Technology(BHU) Center of Excellence in Space Sciences Centre for Mathematical Plasma AstrophysicsDepartment of Mathematics School of Astronomy and Space ScienceNanjing University Key Lab of Modern Astronomy and AstrophysicsNanjing University School of Space ResearchKyung Hee University 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2015年第15卷第10期

页      面：1713-1724页

核心收录：

学科分类：0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 070401[理学-天体物理] 0704[理学-天文学] 0825[工学-航空宇航科学与技术] 

基　　金：support from KU Leuven via GOA/2009-009 support from the Interuniversity Attraction Poles Programme initiated by the Belgian Science Policy Office(IAP P7/08 Charm) supported by the Chinese foundations2011CB811402 the National Natural Science Foundation of China(Grant Nos.11025314,10933003 and 10673004) 

主　　题：Sun: oscillations    Sun: magnetic fields    Sun: filament 

摘      要：We report and analyze observational evidence of global kink oscillations in a solar filament as observed in Ha by instruments administered by National Solar Observatory （NSO）/Global Oscillation Network Group （GONG）. An M1.1-class flare in active region （AR） 11692 occurred on 2013 March 15 and induced a global kink mode in the filament lying towards the southwest of AR 11692. We find periods of about 61-67 minutes and damping times of 92-117 minutes at positions of three ver- tical slices chosen in and around the filament apex. We find that the waves are damped. From the observed period of the global kink mode and damping timescale using the theory of resonant absorption, we perform prominence seismology. We estimate a lower cut-off value for the inhomogeneity length scale to be around 0.34-0.44 times the radius of the filament cross-section.