The inference of minimum temperature of the solar atmosphere from the FISS data

  • Moon, Byeongha (Department of Earth Science Education, Chonnam National University) ;
  • Chae, Jongchul (Astronomy Program, Department of Physics and Astronomy, Seoul National University) ;
  • Kang, Juhyeong (Astronomy Program, Department of Physics and Astronomy, Seoul National University) ;
  • Oh, Suyeon (Department of Earth Science Education, Chonnam National University)
  • Published : 2018.10.10

Abstract

In the solar atmosphere, below the region of temperature minimum, temperature decreases with height and above it, temperature increases with height. Therefore the inference of temperature minimum is a basis of the study about the solar atmosphere and heating problem. The temperature of the temperature minimum region can be inferred from acoustic cutoff frequency. According to a recent study the acoustic cutoff frequency is related to the peak frequency of the power spectrum the chromospheric three-minute velocity oscillations. Using this relationship, we infer the temperature of temperature minimum. The three minute velocity oscillation and its power spectrum are obtained for a pore observed with the Fast Imaging Solar Spectrograph (FISS) $H{\alpha}$ band. We present the inferred temperature and compare it with the temperature of Maltby model. We also investigate the effect of the inclination of magnetic field on the temperature minimum.

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