Abstract Details
| Name: Rakesh Mazumder Affiliation: Center of Excellence in Space Sciences, India(CESSI), IISER KOLKATA Conference ID: ASI2017_510 Title : Simultaneous longitudinal and transverse oscillation in an active filament Authors and Co-Authors : Vaibhav Pant 1. Ding Yuan 3. Dipankar Banerjee 1,2. Abhishek K. Srivastava 4 · Yuandeng Shen 5. 1 Indian Institute of Astrophysics, Koramangala, Bangalore 560034. 2 Center of Excellence in Space Sciences, IISER Kolkata, Mohanpur 741246, West Bengal, India 3 Jeremiah Horrocks Institute, University of Central Lancashire, UK. 4 Indian Institute of Technology (BHU), Varanasi, India 5 Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China Abstract Type : Oral Abstract Category : Sun and the Solar System Abstract : We report on the co-existence of longitudinal and transverse oscilla- tions in an active filament. On March 15 th 2013, a M1.1 class flare was observed in the active region AR 11692. A CME was found to be associated with the flare. The CME generated a shock wave that triggered the oscillations in a nearby filament, situated at the south-west of the active region as observed from National Solar Observatory (NSO)Global Oscillation Network Group(GONG) Hα images. In this work we report the longitudinal oscillations in the two ends of the filament, co-existing with the transverse oscillations. We propose a sce- nario in which an incoming shock wave hits the filament obliquely and triggers both longitudinal and transverse oscillations. Using the observed parameters, we estimate the lower limit of the magnetic field strength. We use simple pendulum model with gravity as the restoring force to estimate the radius of curvature. We also calculate the mass accretion rate which causes the filament motions to damp quite fast. |