Jupiter; Planetary magnetospheres; aurora; Hubble space telescope; morphology; footprint; satellites
Abstract :
[en] Hubble Space Telescope (HST) Wide-Field Planetary Camera 2 (WFPC 2) images of Jupiter's aurora have been obtained close in time with Galileo ultraviolet spectrometer (UVS) spectra and in situ particles, fields, and plasma wave measurements between June 1996 and July 1997, overlapping Galileo orbits G1, G2, G7, G8, and C9. This paper presents HST images of Jupiter's aurora as a first step toward a comparative analysis of the auroral images with the in situ Galileo data. The WFPC 2 images appear similar to earlier auroral images, with the main ovals at similar locations to those observed over the preceding 2 years, and rapidly variable emissions poleward of the main ovals. Further examples have been observed of the equatorward surge of the auroral oval over 140-180° longitude as this region moves from local morning to afternoon. Comparison of the WFPC 2 reference auroral ovals north and south with the VIP4 planetary magnetic field model suggests that the main ovals map along magnetic field lines exceeding 15R[SUB]J[/SUB], and that the Io footprint locations have lead angles of 0-10° from the instantaneous magnetic projection. There was an apparent dawn auroral storm on June 23, 1996, and projections of the three dawn storms imaged with HST to date demonstrate that these appear consistently along the WFPC 2 reference oval. Auroral emissions have been consistently observed from Io's magnetic footprints on Jupiter. Possible systematic variations in brightness are explored, within factor of 6 variations in brightness with time. Images are also presented marked with expected locations of any auroral footprints associated with the satellites Europa and Ganymede, with localized emissions observed at some times but not at other times.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Clarke, John T
Ben Jaffel, Lotfi
Gérard, Jean-Claude ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Language :
English
Title :
Hubble Space Telescope imaging of Jupiter's UV aurora during the Galileo orbiter mission
Publication date :
01 September 1998
Journal title :
Journal of Geophysical Research
ISSN :
0148-0227
eISSN :
2156-2202
Publisher :
American Geophysical Union (AGU), Washington, United States
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Bibliography
Ajello, J.M., et al., Galileo orbiter ultraviolet observations of Jupiter's aurora, J. Geophys. Res., this issue.
Ballester, G.E., et al., Time-resolved observations of Jupiter's far-UV aurora: Comparison of WFPC2 and IUE, Science, 274, 409-413, 1996.
Baron, R., R.D. Joseph, T. Owen, J. Tennyson, S. Miller, and G.E. Ballester, Imaging Jupiter's aurorae from H3+ emissions in the 3-4 μm Band, Nature, 353, 539-542, 1991.
Belcher, J.W., The Jupiter-Io connection: An Alfven engine in space, Science, 238, 170-176, 1987.
Broadfoot, A.L., et al., Extreme ultraviolet observations from Voyager 1 encounter with Jupiter, Science, 204, 979-982, 1979.
Caldwell, J., A.T. Tokunaga, and F.C. Gillett, Possible infrared aurora on Jupiter, Icarus, 44, 667-675, 1980.
Caldwell, J., R. Halthore, G. Orton, and J. Bergstralh, Infrared polar brightenings on Jupiter, IV, Spatial properties of methane emission, Icarus, 74, 331-339, 1988.
Caldwell, J., B. Turgeon, and X.M. Hua, Hubble Space Telescope imaging of the north polar aurora on Jupiter, Science, 257, 1512-1515, 1992.
Carr, T.D., M.D. Desch, and J.K. Alexander, Phenomenology of magnetospheric radio emissions, in Physics of the Jovian Magnetosphere, edited by A.J. Dessler, pp. 226-284, Cambridge Univ. Press, New York, 1983.
Clarke, J.T., H.W. Moos, S.K. Atreya, and A.L. Lane, Observations from Earth orbit and variability of the polar aurora on Jupiter, Astrophys. J. Lett., 241, L179-L182, 1980.
Clarke, J.T., J. Caldwell, T. Skinner, and R. Yelle, The aurora and airglow of Jupiter, Time Variable Phenomena in the Jovian System, NASA Spec. Publ., SP-494, 211-220, 1989.
Clarke, J.T., J. Trauger, J. Holtzman, and the WFPC 2 Science Team, Far-ultraviolet imaging with the Hubble Space Telescope Wide Field Planetary Camera 2, in Calibrating Hubble Space Telescope, edited by A. Koratkar and C. Leitherer, p. 322-333, Space Telescope Sci. Inst., Baltimore, MD, 1995a.
Clarke, J.T. et al., Hubble Space Telescope far-ultraviolet imaging of Jupiter during the impacts of Comet Shoemaker-Levy 9, Science, 267, 1302-1307, 1995b.
Clarke, J.T. et al., Far-UV imaging of Jupiter's aurora with HST/WFPC 2, Science, 274, 404-409, 1996.
Connerney, J.E.P., Doing more with Jupiter's magnetic field, in Planetary Radio Emission, vol. 3, edited by H. Rucker, M.L. Kaiser, and S.J. Bauer, pp.13-33, Austrian Acad. of Sci. Press, Vienna, 1992.
Connerney, J.E.P., R. Baron, T. Satoh, and T. Owen, Images of excited H3+ at the foot of the Io flux tube in Jupiter's atmosphere, Science, 262, 1035-1038, 1993.
Connerney, J.E.P., T. Satoh, and R.L. Baron, Interpretation of auroral "lightcurves" with application to Jovian H3+ emissions, Icarus, 122, 24-35, 1996.
Connerney, J.E.P., M.H. Acuna, N.F. Ness, and T. Satoh, New model of Jupiter's magnetic field constrained by the Io flux tube footprint, Icarus, in press, 1998.
Crary, F.J., and F. Bagenal, Coupling the plasma interaction at Io to Jupiter, Geophys. Res. Lett., 24, 2135-2138, 1997.
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.
Drossart, P., B. Bezard, S.K. Atreya, J. Lacy, E. Serabyn, A. Tokunaga, and T. Encrenaz, Enhanced acetylene emission near the north pole of Jupiter, Icarus, 66, 610-618, 1986.
Drossart, P., Detection of H3+ on Jupiter, Nature, 340, 539-541, 1989.
Drossart, P., R. Prangé, and J.-P. Maillard, Morphology of infrared H3+ emissions in the auroral regions of Jupiter, Icarus, 97, 10-25, 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., et al., A remarkable auroral event on Jupiter observed in the ultraviolet with the Hubble Space Telescope, Science, 266, 1675-1678, 1994.
Gladstone, G.R., J.H. Waite Jr., and W.S. Lewis, Secular and local time dependence of Jovian X ray emissions, J. Geophys. Res., this issue.
Goertz, C.K., Io's interaction with the magnetosphere, J. Geophys. Res., 85, 2949-2954, 1980.
Goldreich, P., and D. Lynden-Bell, Io, a Jovian unipolar inductor, Astrophys. J., 156, 59-78, 1969.
Grodent, D., V. Dols, and J.C. Gérard, The equatorial boundary of the ultraviolet Jovian north aurora observed with multispectral Hubble Space Telescope images, J. Geophys. Res., 101, 2163-2168, 1996.
Harris, W.M., J.T. Clarke, M.A. McGrath, and G.E. Ballester, Analysis of Jovian auroral H Ly-α emission (1981-1990), Icarus, 23, 350-365, 1996.
Holtzman, J., et al., The performance and calibration of the WFPC 2, Publ. Astron. Soc. Pac., 107, 156-178, 1995.
Kim, S.J., P. Drossart, J. Caldwell, J.P. Maillard, T. Herbst, and M. Shure, Images of aurora on Jupiter from H3+ emission at 4 microns, Nature, 353, 536-539, 1991.
Kim, Y.H., S.J. Kim, J.A. Stuewe, J. Caldwell, and T.M. Herbst, Jovian auroral ovals inferred from infrared H3+ images, Icarus, 112, 326-336, 1994.
Kivelson, M.G., K.K. Khurana, C.T. Russell, D.J. Southwood, and R.J. Walker, Global measurements of Jupiter's magnetic field by Galileo (abstract), Eos Trans. AGU, 78, Spring Meet. Suppl., S292, 1997.
Kostiuk, T., M.J. Mumma, J.J. Hillman, D. Buhl, L.W. Brown, and J.L. Faris, NH3 spectral line measurements on Earth and Jupiter using a 10 μm superheterodyne receiver, Infrared Phys.,1, 431-439, 1977.
Livengood,T.A., H.W. Moos, G.E. Ballester, and R. M. Prangé, Jovian auroral activity, 1981-1991, Icarus, 97, 26-45, 1992.
Metzger, A., D.A. Gilman, J.L. Luthey, K.C. Hurley, H.W. Schnopper, F.D. Seward, and J.D. Sullivan, The detection of X rays from Jupiter, J. Geophys. Res., 88, 7731-7741, 1983.
Neubauer, F.M., Nonlinear standing Alfven wave current system at Io: Theory, J. Geophys. Res., 85, 1171-1181, 1980.
Prangé, R., P. Zarka, G.E. Ballester, T.A. Livengood, L. Denis, T. Carr, F. Reyes, S.J. Bame, and H.W. Moos, Correlated variations of UV and radio emissions during an outstanding Jovian auroral event, J. Geophys. Res., 98, 18,779-18,791, 1993.
Prangé, R., et al., Auroral signature of Comet Shoemaker-Levy 9 in the Jovian magnetosphere, Science, 267, 1317-1320, 1995.
Skinner, T.E., S.T. Durrance, P.D. Feldman, and H.W. Moos, IUE observations of longitudinal and temporal variations in the Jovian auroral emission, Astrophys. J., 278, 441-448, 1984.
Trafton, J.T., D.F. Lester, and K.L. Thompson, Unidentified emission lines in Jupiter's northern and southern 2 μm aurorae, Astrophys. J. Lett., 343, L73-L76, 1989.
Trauger, J.T., et al., The on-orbit performance of WFPC 2, Astrophys. J. Lett., 435, L3-L6, 1994.
Trauger, J.T., et al., Saturn's hydrogen aurora: Wide-field planetary camera 2 imaging observations from the Hubble Space Telescope, J. Geophys. Res., this issue.
Vasyliunas, V.M., Plamsa distribution and flow, in Physics of the Jovian Magnetosphere, edited by A. J. Dessler, pp. 395-453, Cambridge, Univ. Press, New York, 1983.
Waite, J.H., et al., ROSAT observations of the Jupiter aurora, J. Geophys. Res., 99, 14,799-14,809, 1994.
West, R.A., E. Karkoschka, A.J. Friedson, M. Seymour, K.H. Baines, and H.B . Hammel, Impact debris particles in Jupiter's stratosphere, Science, 267, 1296-1301, 1995.
Yung, Y.L., G.R. Gladstone, K.M. Chang, J.M. Ajello, and S.K. Shrivastava, H2 fluorescence spectrum from 1200 to 1700 Å by electron impact: Laboratory study and application to Jovian aurora, Astrophys. J. Lett., 254, L65-L69, 1982.
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