Probing the Sunspot Atmosphere with Three-Minute Oscillations
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DOI: 10.1007/s11207-017-1222-0
Abstract: We present a seismological method for probing the solar atmosphere above sunspot umbrae with three-minute oscillations. Our technique allows us to estimate both the vertical distance between atmospheric layers and the wave-propagation speed, without specifying… read more here.
Keywords: minute oscillations; distance; speed; sunspot umbrae ... See more keywords
Detection of emission in the Si I 1082.7 nm line core in sunspot umbrae
Sign Up to like & getrecommendations! Published in 2017 at "Astronomy and Astrophysics"
DOI: 10.1051/0004-6361/201731216
Abstract: Context. Determining empirical atmospheric models for the solar chromosphere is difficult since it requires the observation and analysis of spectral lines that are affected by non-local thermodynamic equilibrium (NLTE) effects. This task is especially difficult… read more here.
Keywords: line; scattered light; 1082 line; sunspot umbrae ... See more keywords