The Bulletin of The Korean Astronomical Society (천문학회보)

The Korean Astronomical Society (한국천문학회)
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An Ellerman bomb-associated surge observed by the FISS/NST

  • Yang, Hee-Su (Department of Physics and Astronomy, Seoul National University) ;
  • Chae, Jong-Chul (Department of Physics and Astronomy, Seoul National University) ;
  • Kim, Yeon-Han (Korea Astronomy & Space Science Institute) ;
  • Cho, Il-Hyun (Korea Astronomy & Space Science Institute)
  • Published : 2012.04.03
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Abstract

We observed a surge associated with an Ellerman bomb using the Fast Imaging Solar Spectrograph(FISS) of the New Solar Telescope at Big Bear Solar Observatory. The surge was seen in absorption and varied rapidly both in H alpha and Ca II 8542 line. It originated from the Ellerman bomb, and was impulsively accelerated to 20km/s of the blueshift(upward) motion. Then the gradual change from blueshift of 20km/s to redshift of 40km/s occurred in 20 minutes. Based on the measured line-of-sight velocities, we estimated the material reached up to about 5,000km height. We inferred physical parameters of the surge by adopting the cloud model, and found that the temperature of the surge material was about 25,000K and the non-thermal velocity was about 10km/s. Our results suggest that the surge might be heated intensely after it was ejected from the Ellerman bomb.

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