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D.M. Hassler (SwRI), F. Auchere (USRA/GSFC), B. Handy (MSU), L. Strachan (SAO), D. Slater (SwRI), T.N. Woods (CU/LASP)
We present results from the November 2, 1998 SwRI/LASP sounding rocket campaign with the dual purpose of providing inter-calibration for the SOHO/EIT and TRACE instruments and providing a measure of the coronal helium abundance by direct comparison of the coronal Ly-alpha lines of He II (304 angstroms) and H I (1216 angstroms). The sounding rocket payload provided full-disk solar images of Fe IX/X 171 and H I Ly-alpha 1216 for inter-calibration with the SOHO/EIT and TRACE instruments, respectively, as well as off-limb observations of the He II 304 line to be compared with off-limb SOHO/UVCS observations of the H I 1216 line to provide a constraint on the coronal helium abundance. This work has been funded in part by NASA under grant NAG5-5140 to Southwest Research Institute.