Density measurement from A1 IX λ385.03/λ392.42 line ratio

Abstract

A1 IX EUV line ratio λ385.03/λ392.42 has been found to be density sensitive. Using this, an electron density of 3.7 × 108 cm-9 is found in the quiet, Sun off-limb from Skylab observation reported by Vernazza and Reeves (1978). © 1991 Kluwer Academic Publishers.