No abstract

No abstract

Absolute intensities and wavelengths for 98 X-ray emission lines between 9 and 22.5 • are reported. The active region spectra were obtained with three rocket-borne crystal spectrometers. Identifications are proposed for 62 of the lines and a model of the emitting plasma is constructed from the intensities of the strongest lines. The emission measure (Ne z V) of the model peaks at 3 x 106 K with a value of 1.5 x 1047 cm -~ and decreases to 1046 cm -s at 5 x 106 K. Effective oscillator and collision strengths are calculated for the other transitions that are observed. The relative intensities of OvlIt and Ne ~x give an oxygen:neon abundance ratio of 8:1. The intensities of the satellite lines to helium-like lines are investigated and it is shown that these lines can be used with confidence in constructing active region models.

No abstract

No abstract