The effect of nonequilibrium ionization on ultraviolet line shifts in the solar transition region

Abstract

view Abstract Citations (29) References (22) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Effect of Nonequilibrium Ionization on Ultraviolet Line Shifts in the Solar Transition Region Spadaro, D. ; Noci, G. ; Zappala, R. A. ; Antiochos, S. K. Abstract The line profiles and wavelength positions of all the important emission lines due to carbon were computed for a variety of steady state siphon flow loop models. For the lines from the lower ionization states (C II-C IV) a preponderance of blueshifts was found, contrary to the observations. The lines from the higher ionization states can show either a net red- or blueshift, depending on the position of the loop on the solar disk. Similar results are expected for oxygen. It is concluded that the observed redshifts cannot be explained by the models proposed here. Publication: The Astrophysical Journal Pub Date: May 1990 DOI: 10.1086/168768 Bibcode: 1990ApJ...355..342S Keywords: Line Spectra; Nonequilibrium Ionization; Radiative Transfer; Solar Corona; Solar Spectra; Ultraviolet Spectra; Emission Spectra; Magnetohydrodynamic Flow; Red Shift; Stellar Models; Solar Physics; ATOMIC PROCESSES; LINE PROFILES; RADIATIVE TRANSFER; SUN: CORONA; SUN: TRANSITION REGION full text sources ADS |