Right ascension: 10:32:06.3 Magnitude: -2.4 Declination: 10:40:29 Image: Unarchived FES image; no number assigned Date: 1992 Apr 4 Exposure duration: 160 sec
Right ascension: 8:27:18.7 Magnitude: -2.5 Declination: 19:57:17 Image: SWP 40962 Date: 1991 Mar 1 12:49 UT Exposure duration: 15 min
The SWP spectrum is from Jupiter's equatorial region. Molecular hydrogen and Lyman alpha emission lines may be detected in the spectrum (but not in this one). IUE and Voyager found a concentration of ionized hydrogen - the Lyman alpha bulge - in the equatorial region. IUE also studies the surface of Io, the torus of matter ejected from Io's surface which encircles Jupiter, and the aurorae in the atmosphere of Jupiter itself.