Publications of The Korean Astronomical Society (천문학논총)

The Korean Astronomical Society (한국천문학회)
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STUDY OF DOPPLER VELOCITY DISTRIBUTION IN AN ACTIVE PROMINENCE

CCD 분광 관측에 의한 활동홍염의 도플러 시선속도분포 연구

  • PARK YOUNG DEUK (Bohyunsan Optical Astronomy Observatory, Korea Astronomy Observatory) ;
  • YUN HONG SIK (Department of Astronomy, Seoul National University) ;
  • MOON YONG-JAE (Bohyunsan Optical Astronomy Observatory, Korea Astronomy Observatory)
  • Published : 1998.12.01
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Abstract

To study kinematics of solar prominences, we have made Ha spectrographic study of an eruptive prominence which appeared on the 27th of August, 1992 with a position angle of 270 deg. The observation was carried out by a Littrow type spectrograph and a G1 CCD camera attached to the 25cm coronagraph at Norikura Coronal Station. In taking the spectral data the slit was placed in parallel to the solar limb at 7 different heights, each being separated by 5 arcsec with a time step of 30 sec. The observed eruptive prominence shows a wide range of line of sight Doppler velocity, spanning from $V_{dopp}=-17.5km/s\;to\;V_{dopp}=58.2km/s$. It is also found that the velocity increases with height at the rate of ${\Delta}V= 0.86 km/s/arcsec$.

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