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Detailed and simplified non-equilibrium helium ionization in the solar atmosphere
Thomas Peter Golding, Mats Carlsson, Jorrit Leenaarts
Helium ionization plays an important role in the energy balance of the upper chromosphere and transition region. Helium spectral lines are also often used as diagnostics of these r…
The Interface Region Imaging Spectrograph (IRIS)
B. De Pontieu, A. M. Title, J. Lemen +85
The Interface Region Imaging Spectrograph (IRIS) small explorer spacecraft provides simultaneous spectra and images of the photosphere, chromosphere, transition region, and corona…
The effect of isotopic splitting on the bisector and inversions of the solar Ca II 854.2 nm line
Jorrit Leenaarts, Jaime de la Cruz Rodríguez, Oleg Kochukhov +1
The Ca II 854.2 nm spectral line is a common diagnostic of the solar chromosphere. The average line profile shows an asymmetric core, and its bisector shows a characteristic invers…