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Nonpotential Broadening of UV Lines Observed at the Limb of the Quiet Sun

Chae, Jongchul; Yun, Hong Sik; Lee, Hyunsook

We have done a spectroscopic study of the solar transition region using high resolution UV & EUV data obtained by SUMER) on board SOHO. Optically thin and conspicuous emission lines observed at the solar limb are carefully selected to acquire average values of physical parameters for the quiet region as a function of radial distance. Our main …

Steady Flow Model of a Magnetic Flux Tube Constrained to Observed Differential Emission Measure

Chae, Jongchul; Bong, Su-Chan; Yun, Hong Sik

We have investigated one dimensional steady flow model of a typical magnetic flux tube in the solar transition region constrained to observed Differential Emission Measure (DEM) for the average quiet-Sun deduced by Raymond & Doyle (1981) with a flux tube geometry conforming to Doppler shifts of UV lines measured by Chae, Yun & Poland (1998…