R. G. Athay

TL;DR: In this paper, the authors computed profiles for Ha and Fei lines for a differentially moving atmosphere and showed that the profiles are asymmetric and that velocity measurements made in the Doppler cores will often lead to erroneous results when the velocity gradient is significant in the regions of the atmosphere where the core forms.

TL;DR: In this paper, the ionization and excitation equilibrium for hydrogen was determined from an exact treatment of the radiative transfer problem for the internally generated Ly-c field and the impressed chromospheric and coronal field.

TL;DR: Spectral line profiles of Si ii and Si iii are presented which were observed both at solar center and near the quiet solar limb with the Naval Research Laboratory EUV spectrograph of ATM/SKYLAB.

TL;DR: In this paper, the authors find that in addition to a depth varying source function, the ratio of the continuous absorption coefficient to the total absorption coefficient must also pass through a minimum in the mid-photosphere, consistent with inward increases of the Doppler width and damping constant in the upper photosphere.

TL;DR: In this paper, the authors show that the prominence eruption cannot be described by a self-similar expansion in which the expansion velocity is a function of radius and time only, but they cannot rule out possible selfsimilar solutions that allow the expansion velocities to be defined by angular direction, and they show that gradients derived by following individual features in their outward progression with time yield values that are consistent with limb observations usually exceed the values obtained from instantaneous distributions.