LABORATORY IDENTIFICATION OF TEMPERATURE DIAGNOSTIC SI-VII AND S-IX LINES PRESENT IN THE SOLAR CORONAL SPECTRA MEASURED BY SUMER SOHO/

The solar coronal spectrum between 500 and 1610 Angstrom and at a heig ht of 21,000 km above the west equatorial limb has recently been recor ded by the SUMER instrument on SOHO. Using laboratory spectra obtained with the beam-foil technique, we report the identification of 32 line s observed in this spectrum as 2s(2)2p(3)3s-2s(2)2p(3)3p and 2s(2)2p(3 )3p-2s(2)2p(3)3d transitions in Si VII and S IX. Theoretical gA-values and branching ratios for the observed lines, obtained from semiempiri cal configuration interaction calculations, are also presented. Intens ity ratios between the 2s(2)2p(4)3P(1)-2s(2)2p(41)S(0) forbidden trans ition and transition from the newly identified high-excitation lines t hat appear in the same wavelength range are temperature sensitive. Cal culations of the intensity ratios between the forbidden line and the h igh-excitation lines for three temperatures are presented. A compariso n between the calculations and some of the SUMER observations is provi ded.