Analysis of a Series of Solar Flare X-Ray Spectra.

The solar coronal X-ray spectrum from 15.4 to 23.0 A - Lines from highly ionized calcium and chromium and their usefulness as plasma diagnostics

“…In the 1979 March 31 flare a maximum no -5x,0 1 0 cm -3 was measured at 2K06 K by using a ratio of 0 VII lines (McKenzie and Landecker 1981), while in the 1979 May 9 flare n e (2xi06 K) > lll 'cm 3 throughout the observations reported here (Dosechek et al 1981).…”