Ballester, GE; Harris, WM; Gladstone, GR; Clarke, JT; Prangé, R; Feldman, PD; Combi, MR; ... Liu, X; + view all Ballester, GE; Harris, WM; Gladstone, GR; Clarke, JT; Prangé, R; Feldman, PD; Combi, MR; Emerich, C; Strobel, DF; Talavera, A; Budzien, SA; Vincent, MB; Livengood, TA; Jessup, KL; McGrath, MA; Hall, DT; Ajello, JM; ben Jaffel, L; Rego, D; Fireman, G; Woodney, L; Miller, S; Liu, X; - view fewer (1995) Far‐UV emissions from the SL9 impacts with Jupiter. Geophysical Research Letters , 22 (17) 2425 - 2428. 10.1029/95GL02422.

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Abstract

Observations with the International Ultraviolet Explorer (IUE) during the impacts of the fragments of comet D/Shoemaker-Levy 9 with Jupiter show far-UV emissions from the impact sites within a similar to 10 min time scale. Positive detections of H-2 Lyman and Werner band (1230-1620 Angstrom) and H-Ly alpha emissions are made for impacts K and S, and marginally for P2. No thermal continuum is observed. The radiated far-UV output was >10(21) ergs. The H-2 spectrum is consistent with electron collisional excitation if significant CH4 absorption is included. Such emissions could result from plasma processes generated by the impacts. Non-thermal excitation by the high altitude entry and explosion shocks may also be relevant. Emissions by Al+ (1671 Angstrom) and C (1657 Angstrom) of cometary origin are tentatively identified.

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