Si xii X‐Ray Satellite Lines in Solar Flare Spectra

The temperature dependence of the Si XII n = 3 and 4 dielectronic satellite line features at 5.82 and 5.56 Å, respectively, near the Si XIII 1 s 2 -1 s 3 p and 1 s 2 -1 s 4 p lines (5.681 and 5.405 Å), is calculated using atomic data presented here. The resulting theoretical spectra are compared with solar flare spectra observed by the RESIK spectrometer on the CORONAS-F spacecraft. The satellites, like the more familiar n = 2 satellites near the Si XIII 1 s 2 -1 s 2 p lines, are formed mostly by dielectronic recombination, but unlike the n = 2 satellites, are unblended. The implications for similar satellite lines in flare Fe spectra are discussed.