Similarity of the Jovian satellite footprints: spots multiplicity and dynamics

[en] In the magnetospheres of Jupiter and Saturn, the intense interaction of the satellites Io, Europa, Ganymede and Enceladus with their surrounding plasma environment leaves a signature in the aurora of the planet. Called satellite footprints, these auroral features appear either as a single spot (Europa and Enceladus) or as multiple spots (Io and Ganymede). Moreover, they can be followed by extended trailing tails in the case of Io and Europa, while no tail has been reported for Ganymede and Enceladus, yet. Here we show that all Jovian footprints can be made of several spots. Furthermore, the footprints all experience brightness variations on timescale of 2-3 minutes. We also demonstrate that the satellite location relative to the plasma sheet is not the only driver for the footprint brightness, but that the plasma environment and the magnetic field strength also play a role. These new findings demonstrate that the Europa and Ganymede footprints are very similar to the Io footprint. As a consequence, the processes expected to take place at Io, such as the bi-directional electron acceleration by Alfvén waves or the partial reflection of these waves on plasma density gradients, can most likely be extended to the other footprints, suggesting that they are indeed universal processes.

Research Center/Unit :

STAR - Space sciences, Technologies and Astrophysics Research - ULiège

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Bonfond, Bertrand ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)

Grodent, Denis ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)

Badman, S. V.

Saur, J.

Gérard, Jean-Claude ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)

Radioti, Aikaterini ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)

Language :

English

Title :

Similarity of the Jovian satellite footprints: spots multiplicity and dynamics

Publication date :

August 2017

Journal title :

Icarus

ISSN :

0019-1035

eISSN :

1090-2643

Publisher :

Elsevier, San Diego, United States - California

Volume :

292

Issue :

2017

Pages :

208–217

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://www.sciencedirect.com/science/article/pii/S0019103516304547

Funders :

BELSPO - Service Public Fédéral de Programmation Politique scientifique

Available on ORBi :

since 11 January 2017

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Bibliography

Badman, S.V., Bonfond, B., Fujimoto, M., Gray, R.L., Kasaba, Y., Kasahara, S., Kimura, T., Melin, H., Nichols, J.D., Steffl, A.J., Tao, C., Tsuchiya, F., Yamazaki, A., Yoneda, M., Yoshikawa, I., Yoshioka, K., Weakening of Jupiter's main auroral emission during january 2014. Geophys. Res. Lett. 43 (2016), 988–997, 10.1002/2015GL067366.
Bonfond, B., Morphology and Dynamics of the Io UV Footprint, 2009, Université de Liège Phd Thesis.
Bonfond, B., The 3-D extent of the Io UV footprint on Jupiter. J. Geophys. Res., 115(A14), 2010, A09217, 10.1029/2010JA015475.
Bonfond, B., Gérard, J.-C., Grodent, D., Saur, J., Ultraviolet Io footprint short timescale dynamics. Geophys. Res. Lett., 34, 2007, 6201, 10.1029/2006GL028765.
Bonfond, B., Grodent, D., Gérard, J.-C., Radioti, A., Saur, J., Jacobsen, S., UV Io footprint leading spot: a key feature for understanding the UV Io footprint multiplicity?. Geophys. Res. Lett., 35, 2008, 5107, 10.1029/2007GL032418.
Bonfond, B., Grodent, D., Gérard, J.-C., Stallard, T., Clarke, J.T., Yoneda, M., Radioti, A., Gustin, J., Auroral evidence of Io's control over the magnetosphere of Jupiter. Geophys. Res. Lett., 39, 2012, 1105, 10.1029/2011GL050253.
Bonfond, B., Hess, S., Bagenal, F., Gérard, J.-C., Grodent, D., Radioti, A., Gustin, J., Clarke, J.T., The multiple spots of the Ganymede auroral footprint. Geophys. Res. Lett. 40 (2013), 4977–4981, 10.1002/grl.50989.
Bonfond, B., Hess, S., Gérard, J.-C., Grodent, D., Radioti, A., Chantry, V., Saur, J., Jacobsen, S., Clarke, J.T., Evolution of the Io footprint brightness I: Far-UV observations. Planet. Space Sci. 88 (2013), 64–75, 10.1016/j.pss.2013.05.023.
Bonfond, B., Vogt, M.F., Gérard, J.-C., Grodent, D., Radioti, A., Coumans, V., Quasi-periodic polar flares at Jupiter: a signature of pulsed dayside reconnections?. Geophys. Res. Lett., 380, 2011, L02104, 10.1029/2010GL045981.
Chust, T., Roux, A., Kurth, W.S., Gurnett, D.A., Kivelson, M.G., Khurana, K.K., Are Io's Alfvén wings filamented? Galileo observations. Planet. Space Sci. 53 (2005), 395–412, 10.1016/j.pss.2004.09.021.
Clarke, J.T., Ajello, J., Ballester, G., Ben Jaffel, L., Connerney, J., Gérard, J.-C., Gladstone, G.R., Grodent, D., Pryor, W., Trauger, J., Waite, J.H., Ultraviolet emissions from the magnetic footprints of Io, Ganymede and Europa on Jupiter. Nature 415 (2002), 997–1000.
Clarke, J.T., Ballester, G.E., Trauger, J., Evans, R., Connerney, J.E.P., Stapelfeldt, K., Crisp, D., Feldman, P.D., Burrows, C.J., Casertano, S., Gallagher III, J.S., Griffiths, R.E., Hester, J.J., Hoessel, J.G., Holtzman, J.A., Krist, J.E., Meadows, V., Mould, J.R., Scowen, P.A., Watson, A.M., Westphal, J.A., Far-ultraviolet imaging of Jupiter's aurora and the lo ”Footprint”. Science 274 (1996), 404–409.
Connerney, J.E.P., Baron, R., Satoh, T., Owen, T., Images of excited H3+ at the foot of the Io flux tube in Jupiter's atmosphere. Science 262 (1993), 1035–1038.
Connerney, J.E.P., Satoh, T., The H3+ ion: a remote diagnostic of the jovian magneto sphere. Astronomy, physics and chemistry of H+3, 2000, 2471–+.
Dumont, M., Grodent, D., Radioti, A., Bonfond, B., Gérard, J.-C., Jupiter's equatorward auroral features: possible signatures of magnetospheric injections. J. Geophys. Res., 119, 2014, 10068, 10.1002/2014JA020527.
Gérard, J.-C., Bonfond, B., Grodent, D., Radioti, A., Clarke, J.T., Gladstone, G.R., Waite, J.H., Bisikalo, D., Shematovich, V.I., Mapping the electron energy in Jupiter's aurora: hubble spectral observations. J. Geophys. Res., 2014, 10.1002/2014JA020514 http://dx.doi.org/10.1002/2014JA020514.
Gérard, J.-C., Saglam, A., Grodent, D., Clarke, J.T., Morphology of the ultraviolet Io footprint emission and its control by Io's location. J. Geophys. Res. 111 (2006), 4202–+, 10.1029/2005JA011327.
Gladstone, G.R., Persyn, S.C., Eterno, J.S., Walther, B.C., Slater, D.C., Davis, M.W., Versteeg, M.H., Persson, K.B., Young, M.K., Dirks, G.J., Sawka, A.O., Tumlinson, J., Sykes, H., Beshears, J., Rhoad, C.L., Cravens, J.P., Winters, G.S., Klar, R.A., Lockhart, W., Piepgrass, B.M., Greathouse, T.K., Trantham, B.J., Wilcox, P.M., Jackson, M.W., Siegmund, O.H.W., Vallerga, J.V., Raffanti, R., Martin, A., Gérard, J.-C., Grodent, D.C., Bonfond, B., Marquet, B., Denis, F., The ultraviolet spectrograph on NASA's Juno mission. Space Sci. Rev., 2014, 10.1007/s11214-014-0040-z.
Goldreich, P., Lynden-Bell, D., Io, a jovian unipolar inductor. Astrophys. J. 156 (1969), 59–78.
Grodent, D., Bonfond, B., Gérard, J.-C., Radioti, A., Gustin, J., Clarke, J.T., Nichols, J., Connerney, J.E.P., Auroral evidence of a localized magnetic anomaly in Jupiter's northern hemisphere. J. Geophys. Res. 113:A12 (2008), 9201–+, 10.1029/2008JA013185.
Grodent, D., Bonfond, B., Radioti, A., Gérard, J.-C., Jia, X., Nichols, J.D., Clarke, J.T., Auroral footprint of Ganymede. J. Geophys. Res. 114 (2009), 7212–+, 10.1029/2009JA014289.
Grodent, D., Gérard, J.-C., Gustin, J., Mauk, B.H., Connerney, J.E.P., Clarke, J.T., Europa's FUV auroral tail on Jupiter. Geophys. Res. Lett. 33 (2006), 6201–+, 10.1029/2005GL025487.
Gustin, J., Bonfond, B., Grodent, D., Gérard, J.C., Conversion from HST ACS and STIS auroral counts into brightness, precipitated power and radiated power for h2 giant planets j. J. Geophys. Res., 117(A16), 2012, 7316, 10.1029/2012JA017607.
Gustin, J., Grodent, D., Ray, L.C., Bonfond, B., Bunce, E.J., Nichols, J.D., Ozak, N., Characteristics of north jovian aurora from STIS FUV spectral images. Icarus 268 (2016), 215–241, 10.1016/j.icarus.2015.12.048.
Hess, S., Bonfond, B., Chantry, V., Gérard, J.-C., Grodent, D., Jacobsen, S., Radioti, A., Evolution of the Io footprint brightness II: modeling. Planet. Space Sci., 2013.
Hess, S., Zarka, P., Mottez, F., Ryabov, V.B., Electric potential jumps in the Io-Jupiter flux tube. Planet. Space Sci. 57 (2009), 23–33, 10.1016/j.pss.2008.10.006.
Hess, S.G.P., Delamere, P.A., Dols, V., Ray, L.C., Comparative study of the power transferred from satellite-magnetosphere interactions to auroral emissions. J. Geophys. Res., 116, 2011, A01202, 10.1029/2010JA015807.
Hess, S.L.G., Bonfond, B., Delamere, P.A., How could the Io footprint disappear?. Planet. Space Sci. 89 (2013), 102–110, 10.1016/j.pss.2013.08.014.
Hess, S.L.G., Bonfond, B., Zarka, P., Grodent, D., Model of the Jovian magnetic field topology constrained by the Io auroral emissions. J. Geophys. Res., 116, 2011, A05217, 10.1029/2010JA016262.
Hess, S.L.G., Delamere, P., Dols, V., Bonfond, B., Swift, D., Power transmission and particle acceleration along the Io flux tube. J. Geophys. Res., 115, 2010, A06205, 10.1029/2009JA014928.
Jacobsen, S., Neubauer, F.M., Saur, J., Schilling, N., Io's nonlinear MHD-wave field in the heterogeneous Jovian magnetosphere. Geophys. Res. Lett. 34 (2007), 10202–+, 10.1029/2006GL029187.
Jacobsen, S., Saur, J., Neubauer, F.M., Bonfond, B., Gérard, J.-C., Grodent, D., Location and spatial shape of electron beams in Io's wake. J. Geophys. Res., 115, 2010, A04205, 10.1029/2009JA014753.
Jia, X., Kivelson, M.G., Khurana, K.K., Walker, R.J., Magnetic fields of the satellites of Jupiter and Saturn. Space Sci. Rev. 152 (2009), 271–305, 10.1007/s11214-009-9507-8.
Jia, X., Walker, R.J., Kivelson, M.G., Khurana, K.K., Linker, J.A., Three-dimensional MHD simulations of Ganymede's magnetosphere. J. Geophys. Res. 113 (2008), 6212–+, 10.1029/2007JA012748.
Jones, S.T., Su, Y.-J., Role of dispersive Alfvén waves in generating parallel electric fields along the Io-Jupiter fluxtube. J. Geophys. Res. 113 (2008), 12205–+, 10.1029/2008JA013512.
Mauk, B.H., Clarke, J.T., Grodent, D., Waite, J.H., Paranicas, C.P., Williams, D.J., Transient aurora on Jupiter from injections of magnetospheric electrons. Nature 415 (2002), 1003–1005.
Neubauer, F.M., Nonlinear standing Alfven wave current system at Io - Theory. J. Geophys. Res. 85 (1980), 1171–1178.
Payan, A.P., Rajendar, A., Paty, C.S., Crary, F., Effect of plasma torus density variations on the morphology and brightness of the Io footprint. J. Geophys. Res. 119 (2014), 3641–3649, 10.1002/2013JA019299.
Prangé, R., Rego, D., Southwood, D., Zarka, P., Miller, S., Ip, W., Rapid energy dissipation and variability of the Io-Jupiter electrodynamic circuit. Nature 379 (1996), 323–325, 10.1038/379323a0.
Pryor, W.R., Rymer, A.M., Mitchell, D.G., Hill, T.W., Young, D.T., Saur, J., Jones, G.H., Jacobsen, S., Cowley, S.W.H., Mauk, B.H., Coates, A.J., Gustin, J., Grodent, D., Gérard, J.-C., Lamy, L., Nichols, J.D., Krimigis, S.M., Esposito, L.W., Dougherty, M.K., Jouchoux, A.J., Stewart, A.I.F., McClintock, W.E., Holsclaw, G.M., Ajello, J.M., Colwell, J.E., Hendrix, A.R., Crary, F.J., Clarke, J.T., Zhou, X., The auroral footprint of Enceladus on Saturn. Nature 472 (2011), 331–333, 10.1038/nature09928.
Saur, J., Grambusch, T., Duling, S., Neubauer, F.M., Simon, S., Magnetic energy fluxes in sub-Alfvénic planet star and moon planet interactions. Astron. Astrophys., 552, 2013, A119, 10.1051/0004-6361/201118179.
Saur, J., Neubauer, F.M., Connerney, J.E.P., Zarka, P., Kivelson, M.G., Jupiter. The Planet, Satellites and Magnetosphere. 2004, Cambridge University Press Plasma interaction of Io with its plasma torus pp. 537-560.
Tao, C., Kimura, T., Badman, S.V., Murakami, G., Yoshioka, K., Tsuchiya, F., André, N., Yoshikawa, I., Yamazaki, A., Shiota, D., Tadokoro, H., Fujimoto, M., Variation of Jupiter's aurora observed by Hisaki/EXCEED: 1. Observed characteristics of the auroral electron energies compared with observations performed using HST/STIS. J. Geophys. Res. 121 (2016), 4041–4054, 10.1002/2015JA021271.
Vasavada, A.R., Bouchez, A.H., Ingersoll, A.P., Little, B., Anger, C.D., Team, T.G.S., Jupiter's visible aurora and Io footprint. J. Geophys. Res. 104 (1999), 27133–+.
Wannawichian, S., Clarke, J.T., Nichols, J.D., Ten years of Hubble Space Telescope observations of the variation of the Jovian satellites’ auroral footprint brightness. J. Geophys. Res, 115, 2010, A02206, 10.1029/2009JA014456.
Williams, D.J., Mauk, B.H., McEntire, R.E., Roelof, E.C., Armstrong, T.P., Wilken, B., Roederer, J.G., Krimigis, S.M., Fritz, T.A., Lanzerotti, L.J., Electron beams and lon composition measured at lo and in its Torus. Science 274 (1996), 401–403.