Abstract


  FIRST OBSERVATIONAL EVIDENCE OF TRAPPING OF FAST MODE EUV WAVES AT MAGNETIC SEPARATRIX

  R. Chandra, Kumaun university, Nainital, rchandra.ntl@gmail.com
  P. Chen, School of Astronomy and Space Science, Nanjing University, Nanjing - 210 023, China,
  A. Fulara, Department of Physics, DSB Campus, Kumaun University, Nainital- 263 001, India,
  A. Srivastava, Department of Physics, IIT (BHU), Varanasi - 221 005, India,
  W. Uddin, 4Aryabhatta Research Institute of Observational Sciences, Nainital - 263 001, India ,

We discuss here the multi-wavelength observations of a quiescent filament eruption, which is associated with a B-class flare and extreme ultraviolet (EUV) waves on 11 May 2011. The eruption is also associated with type-II radio bursts and coronal mass ejections (CME). The event is observed by Solar Dynamic Observatory (SDO) in different wavebands. The associated type-II radio bursts are observed by HiRAS radio spectrometer, whileas the CME is observed by Solar and Heliospheric Observatory (SOHO) and Solar Terrestrial Relations Observatory (STEREO) satellite. We observed two types of EUV waves propagating outward, while the two flare ribbons are localized near the magnetic polarity inversion line (PIL). The faster and slower EUV wave have a propagation speed of ~500 km/s and ~120 km/s respectively. We report for the first time that not only the slower EUV wave stops at magnetic separatrix, but also the faster EUV wave leave another stationary EUV front behind.