The Bulletin of The Korean Astronomical Society (천문학회보)

The Korean Astronomical Society (한국천문학회)
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BITSE Preliminary Results

  • Bong, Su-Chan (Korea Astronomy and Space Science Institute) ;
  • Yang, Heesu (Korea Astronomy and Space Science Institute) ;
  • Lee, Jae-Ok (Korea Astronomy and Space Science Institute) ;
  • Kim, Yeon-Han (Korea Astronomy and Space Science Institute) ;
  • Cho, Kyung-Suk (Korea Astronomy and Space Science Institute) ;
  • Choi, Seonghwan (Korea Astronomy and Space Science Institute) ;
  • Baek, Ji-Hye (Korea Astronomy and Space Science Institute) ;
  • Park, Jongyeob (Korea Astronomy and Space Science Institute) ;
  • Kim, Jihun (Korea Astronomy and Space Science Institute) ;
  • Park, Young-Deuk (Korea Astronomy and Space Science Institute) ;
  • Kim, Rok-Soon (Korea Astronomy and Space Science Institute) ;
  • Lim, Eun-Kyung (Korea Astronomy and Space Science Institute) ;
  • Yashiro, Seiji (NASA Goddard Space Flight Center) ;
  • Makela, Pertti A. (NASA Goddard Space Flight Center) ;
  • Reginald, Nelson L. (NASA Goddard Space Flight Center) ;
  • Thakur, Neeharika (NASA Goddard Space Flight Center) ;
  • Gopalswamy, Natchimuthuk (Korea Astronomy and Space Science Institute) ;
  • Newmark, Jeffrey S. (Korea Astronomy and Space Science Institute) ;
  • Gong, Qian (Korea Astronomy and Space Science Institute)
  • Published : 2021.04.13
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Abstract

The Balloon-borne Investigation of Temperature and Speed of Electrons in the corona (BITSE) is a technology demonstration mission launched in 2019 to observe the solar corona from ~3 Rs to 15 Rs at four wavelengths (393.5, 405.0, 398.7, and 423.4 nm). Preliminary analysis shows that BITSE imaged the solar minimum corona with the equatorial streamers on the east and west limbs. The narrow streamers observed by BITSE are in good agreement with the geometric properties obtained by the Solar and Heliospheric Observatory (SOHO) coronagraphs in the overlapping physical domain. In spite of the small signal-to-noise ratio we were able to obtain the temperature and flow speed of the western steamer. In the heliocentric distance range 4 - 7 Rs on the western streamer, we obtained a temperature of ~ 1.0 ± 0.3 MK and a flow speed of ~ 260 km s-1 with a large uncertainty interval.

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