New light on an old problem of the cores of solar resonance lines
Philip Judge,
Lucia Kleint,
Jorrit Leenaarts
et al.
Abstract:We re-examine a 50+ year-old problem of deep central reversals predicted for strong solar spectral lines, in contrast to the smaller reversals seen in observations. We examine data and calculations for the resonance lines of H I, Mg II and Ca II, the self-reversed cores of which form in the upper chromosphere. Based on 3D simulations as well as data for the Mg II lines from IRIS, we argue that the resolution lies not in velocity fields on scales in either of the micro-or macro-turbulent limits. Macroturbulence… Show more
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