[en] Multispectral observations of the far ultraviolet Jovian aurora with the faint object camera (FOC) on board the Hubble Space Telescope are reported. They are used to describe and compare the morphology and the mean brightness of the H-2 Lyman and Werner bands observed at 153, 125, and 130 nm. It is shown that most of the emissions are confined inside the 6 R(J) O-6-GSFC auroral oval and fill a large fraction of the polar cap. During the similar to 50 hours time span of the observations following a very strong aurora, no bright are was observed along the oval mapping the 30 R(J) O-6 oval. Hydrogen emissions at 125 and 130 nm are observed down to 50 degrees N and somewhat below, a region not accessible to previous FOC observations at longer wavelengths. Temporal variations are also observed on timescales of hours to days.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Grodent, Denis ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Dols, V.
Gérard, Jean-Claude ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Rego, D.
Language :
English
Title :
The equatorial boundary of the ultraviolet Jovian north aurora observed with multispectral Hubble Space Telescope images
Publication date :
1996
Journal title :
Journal of Geophysical Research
ISSN :
0148-0227
eISSN :
2156-2202
Publisher :
American Geophysical Union (AGU), Washington, United States - District of Columbia
Ajello, J.M., D.E. Shemansky, and G.K. James, Cross sections for production of H(2p, 2s, 1s) by electron collisional dissociation of H2, Astrophys. J., 371, 422-431, 1991.
Broadfoot, A.L., et al., Extreme ultraviolet observations from Voyager 1 encounter with Jupiter, Science, 204, 979-982, 1979
Broadfoot, A.L., B.R. Sandel, D.E. Shemansky, J.C. McConnell, G.R. Smith, J.B. Holberg, S.K. Atreya, T.M. Donahue, D.F. Strobel, and J.L. Bertaux, Overview of the Voyager ultraviolet spectrometry results through Jupiter encounter, J. Geophys. Res., 86, 8259-8284, 1981.
Caldwell, J.A., B. Turgeon, and X.M. Hua, Hubble Space Telescope imaging of the north polar aurora on Jupiter, Science, 257, 1512-1515, 1992.
Clarke, J.T., L. Ben Jaffel, A. Vidal-Madjar, G.R. Gladstone, J.H. Waite, R. Prangé, J.C. Gérard, J. Ajello, and G. James, Hubble Space Telescope Goddard high-resolution spectrograph H2 rotational spectra of Jupiter's aurora, Astrophys. J., 430, L73-L76, 1994.
Clarke, J.T., et al., Hubble Space Telescope far-ultraviolet imaging of Jupiter during the impacts of comet Shoemaker-Levy 9, Science, 267, 1302-1306, 1995.
Connerney, J.E.P., Jupiter's magnetic field, in Planetary Radio Emission III, edited by H. Rucker, M.L. Kaiser, and S.J. Bauer, pp. Vienna, 13-33, Austrian Academy of Sciences Press, 1992.
Dols, V., J.C. Gérard, F. Paresce, R. Prangé and A. Vidal-Madjar, Ultraviolet imaging of the Jovian aurora with the Hubble Space Telescope, Geophys. Res. Lett., 19, 1803-1806, 1992.
Gérard, J.C., V. Dols, F. Paresce, and R. Prangé, Morphology and time variation of the Jovian far UV aurora : Hubble Space Telescope observations, J. Geophys. Res., 98, 18,793-18,801, 1993.
Gérard, J.C., D. Grodent, R. Prangé, J.H. Waite, G.R. Gladstone, V. Dols, F. Paresce, A. Storrs, L. Ben Jaffel, and K.A. Franke, A remarkable auroral event on Jupiter observed in ultraviolet with the Hubble Space Telescope, Science, 266, 1675-1677, 1994.
Gérard, J.C., V. Dols, R. Prangé, and F. Paresce, The morphology of the north Jovian ultraviolet aurora observed with the Hubble Space Telescope: A full longitudinal mapping, Planet. Space Sci., 42, 905-917, 1994b.
Trafton, L.M., J.C. Gérard, G. Munhoven, and J.H.Waite, High-resolution spectra of Jupiter's northern auroral ultraviolet emission with the Hubble Space Telescope, Astrophys. J., 421, 816-827, 1994.