Vol 18, No 2

Statistical analysis of dynamic fibrils observed from NST/BBSO observations

Thambaje Gopalan Priya, Jiang-Tao Su, Jie Chen, Yuan-Yong Deng, Debi Prasad Choudhury


Abstract We present the results obtained from the analysis of dynamic fibrils in NOAA active region (AR) 12132, using high resolution Hα observations from the New Solar Telescope operating at Big Bear Solar Observatory. The dynamic fibrils are seen to be moving up and down, and most of these dynamic fibrils are periodic and have a jet-like appearance. We found from our observations that the fibrils follow almost perfect parabolic paths in many cases. A statistical analysis on the properties of the parabolic paths showing an analysis on deceleration, maximum velocity, duration and kinetic energy of these fibrils is presented here. We found the average maximum velocity to be around 15 km s−1 and mean deceleration to be around 100 m s−2. The observed deceleration appears to be a fraction of gravity of the Sun and is not compatible with the path of ballistic motion due to gravity of the Sun. We found a positive correlation between deceleration and maximum velocity. This correlation is consistent with simulations done earlier on magnetoacoustic shock waves propagating upward.


Keywords Sun: sunspots-oscillation — Sun: magnetic fields — Sun: chromosphere

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