THEORETICAL RATIOS FOR THE EUV LINES OF AL-VIII IONS

Theoretical line ratios for the Al VIII ion have been investigated usi ng an atomic model including the first fifteen energy levels, and taki ng account of various physical processes. The line emissivities as a f unction of electron density have been computed. Density-dependent theo retical line ratios are presented and their diagnostic applications in the solar atmosphere are discussed with the help of theoretical line intensities computed using an atmospheric model for the quiet Sun.