114 citations · 621 across the 19 of their papers we have counts for
3 papers · 1 filter
X-ray line coincidence photopumping in a solar flare
F. P. Keenan, K. Poppenhaeger, M. Mathioudakis +6
Line coincidence photopumping is a process where the electrons of an atomic or molecular species are radiatively excited through the absorption of line emission from another specie…
Intensity enhancement of O VI ultraviolet emission lines in solar spectra due to opacity
F. P. Keenan, J. G. Doyle, M. S. Madjarska +5
Opacity is a property of many plasmas, and it is normally expected that if an emission line in a plasma becomes optically thick, its intensity ratio to that of another transition t…
A search for line intensity enhancements in the far-UV spectra of active late-type stars arising from opacity
F. P. Keenan, D. J. Christian, S. J. Rose +1
Radiative transfer calculations have predicted intensity enhancements for optically thick emission lines, as opposed to the normal intensity reductions, for astrophysical plasmas u…