Density and temperature diagnostics of solar emission lines from NA VII and AL IX

Abstract

Line intensity ratios of extreme ultraviolet (EUV) emission lines from Na VII and Al IX have been considered for electron density and temperature determinations within the chromosphere-corona transition region and the corona. The electron pressure within the emission region has been assumed to be a constant parameter. Theoretical line intensities for these ions have been computed using a model solar atmosphere and compared with the values as observed by the Apollo Telescope Mount (ATM) ultraviolet spectrometer. The observed intensities correspond to the average quiet-Sun conditions near solar minimum.