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Diagnostics of active and eruptive prominences through hydrogen and helium lines modelling
Nicolas Labrosse, Jean-Claude Vial, Pierre Gouttebroze
In this study we show how hydrogen and helium lines modelling can be used to make a diagnostic of active and eruptive prominences. One motivation for this work is to identify the p…
O VI and H_2 Lines in Sunspots
Nicolas Labrosse, Huw Morgan, Shadia Rifai Habbal +1
Sunspots are locations on the Sun where unique atmospheric conditions prevail. In particular, the very low temperatures found above sunspots allow the emission of H_2 lines. In thi…
Spectral Diagnostics of Active Prominences
Nicolas Labrosse, Pierre Gouttebroze, Jean-Claude Vial
Active prominences exhibit plasma motions, resulting in difficulties with the interpretation of spectroscopic observations. These solar features being strongly influenced by the ra…
Plasma diagnostic of a solar prominence from hydrogen and helium resonance lines
N. Labrosse, J. -C. Vial, P. Gouttebroze
We present the first comparison of profiles of H et He resonance lines observed by SUMER with theoretical profiles computed with our non-LTE radiative transfer code. We use the H I…
The Helium spectrum in erupting solar prominences
Nicolas Labrosse, Pierre Gouttebroze, Jean-Claude Vial
Even quiescent solar prominences may become active and sometimes erupt. These events are occasionally linked to coronal mass ejections. However we know very little about the plasma…
Effect of motions in prominences on the helium resonance lines in the extreme ultraviolet
Nicolas Labrosse, Pierre Gouttebroze, Jean-Claude Vial
We aim at studying the effect of radial motions on the spectrum emitted by moving prominences in the helium resonance lines and at facilitating the interpretation of observations,…