38 citations · 56 across the 8 of their papers we have counts for
6 papers · 1 filter
On the Branching in the Emission Relations of Ca II lines in Solar Prominences
G. Stellmacher, E. Wiehr
We observe simultaneously the Ca II K, Ca II 8542 and H-beta emissions in solar prominences at high spatial and spectral resolution. We confirm a branching in the emission relation…
Dependence of the He/H8 emission ratio on brightness, temperature, and structuring of prominences
G. Stellmacher, E. Wiehr
We investigate the dependence of the He/H8 emission ratio on kinetic temperature and total Balmer brightness. The line pair He\,{\sc i}\,3888\,Å and H\,3889 has been observed s…
Observation of an Instability in a 'Quiescent' Prominence
G. Stellmacher, E. Wiehr
We present the detection of a bubble-like cavity traveling through a quiescent prominence. The H-alpha emission in the cavity is >16 times smaller than in its surroundings. The cav…
The Infrared Ca II lines in Sunspot Umbrae
W. Kollatschny, G. Stellmacher, E. Wiehr +1
We present an empirical working model for sunspot umbrae which equally describes observed continuum intensities and line profiles. The wings of the infrared Ca II lines depend sens…
Solar prominences with Na and Mg emissions and centrally reversed Balmer line
G. Stellmacher, E. Wiehr
We study spectral lines in exceptionally bright solar limb prominences with pronounced sodium and magnesium emission. We find that most prominences with significant NaD2 and Mgb2 e…
On the Origin of the Balmer and Lyman Emission Lines
G. Stellmacher, E. Wiehr
We show how the observed hydrogen Balmer and Lyman emission lines constrain the modeling of quiescent solar prominences. We compare space observations of Lyman lines with ground-ba…