Abstract
The Solar EUV Rocket Telescope and Spectrograph (SERTS) obtained spectra and images of active regions, quiet Sun areas, and other solar features during successful flights in 1989, 1991, 1993, and 1995. The availability of multiple emission lines from eight ionization stages of iron (1) furnishes line ratio temperature diagnostic tools which are independent of elemental abundance uncertainties, (2) enables verification of the instrumental photometric calibration and atomic physics parameters through density- and temperature-insensitive ratios, (3) provides a means of deriving plasma densities, and (4) supplies input for DEM analyses. Temperatures derived from seven different line ratios are shown in Figure 1. For ratios among the higher ionization stages of iron, the derived active region temperature is greater than that of the quiet Sun; for ratios among the lower ionization stages, the active region and quiet Sun temperatures converge. Differential emission measure distributions were derived using the procedure developed by Monsignori-Fossi & Landini for SOHO. An active region DEM is shown in Fig 2. Details are provided in a paper submitted to Astrophysical Journal.
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