Relative Coronal Abundances Derived from X-Ray Observations of Sodium,Magnesium,Aluminum,Silicon,Sulfur,and Argon.

摘要

The authors observed the coronal spectrum between 3.5and 8.5 A and several levels of coronal activity,and determined absolute fluxes for 79lines and for the continuum. Identifications have been determined for the majority of the lines observed,and in particular for the resonance lines of Mg XI,Mg XII,Al XII,Al XIII,Si XIII,Si XIV, S XV and S XVI. The measured fluxes of these lines have been used to construct a model of the temperature dependence of the coronal emission measure between 1.5and 10 x 10to the 6th power K. This model is used to determine the relative abundances of Mg,Al,Si,and S. The relative abundances of Ar and Na were also computed,using the observed intensities of weak lines of these two elements. (Modified author abstract)