Abstract


  SIMULTANEOUS LONGITUDINAL AND TRANSVERSE OSCILLATION SEEN IN A LOOP-LIKE FILAMENT

  R. Mazumder, IISER Kolkata, rakesh@iiap.res.in
  V. Pant, Indian Institute of Astrophysics, vaibhav@iiap.res.in
  D. Banerjee, Indian Institute of Astrophysics, dipu@iiap.res.in

On March 15th 2013 a M1.1 Class flare took place in active region AR11692. This flare creates shock wave which caused oscillation in the filament situated in south-west region of the active region which is observed from National Solar Observatory ({\it NSO})/Global Oscillation Network Group({\it GONG}) H$\alpha$ data. In this paper we are reporting longitudinal oscillations in two part of the filament. This is first observational evidence of coexistence of both longitudinal and transverse oscillations in same filament. We are proposing a scenario of incoming shock wave hits the filament in an oblique angle and hence it triggers both longitudinal and transverse oscillations in the filament. We estimate the minimum value of the magnetic field in the filament and the radius of curvature two magnetic deep in the filament with a simple model which consider gravity as a restoring force.