Planetary Sciences: Comets and Small Bodies: Magnetic fields and magnetism; Planetary Sciences: Solar System Objects: Jupiter; Magnetospheric Physics: Magnetosphere interactions with satellites and rings
Abstract :
[en] The determination of the internal magnetic field of Jupiter has been the object of many studies and publications. These models have been computed from the Pioneer, Voyager, and Ulysses measurements. Some models also use the position of the Io footprints as a constraint: the magnetic field lines mapping to the footprints must have their origins along Io's orbit. The use of this latter constraint to determine the internal magnetic field models greatly improved the modeling of the auroral emissions, in particular the radio ones, which strongly depends on the magnetic field geometry. This constraint is, however, not sufficient for allowing a completely accurate modeling. The fact that the footprint field line should map to a longitude close to Io's was not used, so that the azimuthal component of the magnetic field could not be precisely constrained. Moreover, a recent study showed the presence of a magnetic anomaly in the northern hemisphere, which has never been included in any spherical harmonic decomposition of the internal magnetic field. We compute a decomposition of the Jovian internal magnetic field into spherical harmonics, which allows for a more accurate mapping of the magnetic field lines crossing Io, Europa, and Ganymede orbits to the satellite footprints observed in UV. This model, named VIPAL, is mostly constrained by the Io footprint positions, including the longitudinal constraint, and normalized by the Voyager and Pioneer magnetic field measurements. We show that the surface magnetic fields predicted by our model are more consistent with the observed frequencies of the Jovian radio emissions than those predicted by previous models.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Hess, S. L. G.
Bonfond, Bertrand ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Zarka, P.
Grodent, Denis ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Language :
English
Title :
Model of the Jovian magnetic field topology constrained by the Io auroral emissions
Publication date :
2011
Journal title :
Journal of Geophysical Research. Space Physics
ISSN :
2169-9380
eISSN :
2169-9402
Publisher :
American Geophysical Union (AGU), Washington, United States - District of Columbia
Acuna, M. A., and N. F. Ness (1975), The Pioneer XI high field fluxgate magnetometer, Space Sci. Instrum., 1, 177-188.
Acuna, M. H., and N. F. Ness (1975), Jupiter's main magnetic field measured by Pioneer 11, Nature, 253, 327-328.
Behannon, K. W., M. H. Acuna, L. F. Burlaga, R. P. Lepping, N. F. Ness, and F. M. Neubauer (1977), Magnetic field experiment for Voyagers 1 and 2, Space Sci. Rev., 21, 235-257.
Bigg, E. K. (1964), Influence of the satellite Io on Jupiter's decametric emission, Nature, 203, 1008-1010.
Boischot, A., A. Lecacheux, M. L. Kaiser, M. D. Desch, J. K. Alexander, and J. W. Warwick (1981), Radio Jupiter after Voyager: An overview of the planetary radio astronomy observations, J. Geophys. Res., 86, 8213-8226.
Bonfond, B. (2010), The 3-D extent of the Io UV footprint on Jupiter, J. Geophys. Res., 115, A09217, doi:10.1029/2010JA015475.
Bonfond, B., D. Grodent, J.-C. Gérard, A. Radioti, J. Saur, and S. Jacobsen (2008), UV Io footprint leading spot: A key feature for understanding the UV Io footprint multiplicity?, Geophys. Res. Lett., 35, L05107, doi:10.1029/2007GL032418. (Pubitemid 351675985)
Bonfond, B., D. Grodent, J.-C. Gérard, A. Radioti, V. Dols, P. A. Delamere, and J. T. Clarke (2009), The IoUVfootprint: Location, inter-spot distances and tail vertical extent, J. Geophys. Res., 114, A07224, doi:10.1029/ 2009JA014312.
Branduardi-Raymont, G., R. F. Elsner, M. Galand, D. Grodent, T. E. Cravens, P. Ford, G. R. Gladstone, and J. H. Waite Jr. (2008), Spectral morphology of the X-ray emission from Jupiter's aurorae, J. Geophys. Res., 113, A02202, doi:10.1029/2007JA012600.
Burke, B. F., and K. L. Franklin (1955), Observations of a variable radio source associated with the planet Jupiter, J. Geophys. Res., 60, 213-217.
Carr, T. D., M. D. Desch, and J. K. Alexander (1983), Phenomenology of magnetospheric radio emissions, in Physics of the Jovian Magnetosphere, edited by A. J. Dessler, pp. 226-284, Cambridge Univ. Press, Cambridge, U. K.
Clarke, J. T., et al. (1996), Far-ultraviolet imaging of Jupiter's aurora and the Io "footprint," Science, 274, 404-409, doi:10.1126/science. 274.5286.404. (Pubitemid 26353351)
Clarke, J. T., et al. (2002), Ultraviolet emissions from the magnetic footprints of Io, Ganymede and Europa on Jupiter, Nature, 415, 997-1000. (Pubitemid 34193440)
Connerney, J. E. P. (1981), The magnetic field of Jupiter: A generalized inverse approach, J. Geophys. Res., 86, 7679-7693, doi:10.1029/ JA086iA09p07679.
Connerney, J. E. P. (1993), Magnetic fields of the outer planets, J. Geophys. Res., 98, 18,659-18,679, doi:10.1029/93JE00980.
Connerney, J. E. P. (2007), Planetary magnetism, in Treatise on Geophysics, vol. 10, Planets and Moons, edited by G. Schubert and T. Spohn, pp. 243-280, Elsevier, Oxford, U. K.
Connerney, J. E. P., and T. Satoh (2000), The H3+ ion: A remote diagnostic of the Jovian magnetosphere, in Astronomy, Physics and Chemistry of H3+, edited by E. Herbst et al., Philos. Trans. R. Soc. London, Ser. A, 358, pp. 2471-2483.
Connerney, J. E. P., M. H. Acuña, and N. F. Ness (1981), Modeling the Jovian current sheet and inner magnetosphere, J. Geophys. Res., 86, 8370-8384, doi:10.1029/JA086iA10p08370.
Connerney, J. E. P., R. Baron, T. Satoh, and T. Owen (1993), Images of excited H3+ at the foot of the Io flux tube in Jupiter's atmosphere, Science, 262, 1035-1038, doi:10.1126/science.262.5136.1035. (Pubitemid 24035551)
Connerney, J. E. P., M. H. Acuña, and N. F. Ness (1996), Octupole model of Jupiter's magnetic field from Ulysses observations, J. Geophys. Res., 101, 27,453-27,458, doi:10.1029/96JA02869.
Connerney, J. E. P., M. H. Acuña, N. F. Ness, and T. Satoh (1998), New models of Jupiter's magnetic field constrained by the Io flux tube footprint, J. Geophys. Res., 103, 11,929-11,939, doi:10.1029/97JA03726. (Pubitemid 128665247)
Delamere, P. A., F. Bagenal, R. Ergun, and Y.-J. Su (2003), Momentum transfer between the Io plasma wake and Jupiter's ionosphere, J. Geophys. Res., 108(A6), 1241, doi:10.1029/2002JA009530.
Ergun, R. E., L. Ray, P. A. Delamere, F. Bagenal, V. Dols, and Y. J. Su (2009), Generation of parallel electric fields in the Jupiter-Io torus wake region, J. Geophys. Res., 114, A05201, doi:10.1029/2008JA013968.
Genova, F., and M. G. Aubier (1985), Io-dependent sources of the Jovian decameter emission, Astron. Astrophys., 150, 139-150.
Gérard, J.-C., A. Saglam, D. Grodent, and J. T. Clarke (2006), Morphology of the ultraviolet Io footprint emission and its control by Io's location, J. Geophys. Res., 111, A04202, doi:10.1029/2005JA011327.
Grodent, D., J.-C. Gérard, J. Gustin, B. H. Mauk, J. E. P. Connerney, and J. T. Clarke (2006), Europa's FUV auroral tail on Jupiter, Geophys. Res. Lett., 33, L06201, doi:10.1029/2005GL025487.
Grodent, D., B. Bonfond, J.-C. Gérard, A. Radioti, J. Gustin, J. T. Clarke, J. Nichols, and J. E. P. Connerney (2008a), Auroral evidence of a localized magnetic anomaly in Jupiter's northern hemisphere, J. Geophys. Res., 113, A09201, doi:10.1029/2008JA013185.
Grodent, D., J.-C. Gérard, A. Radioti, B. Bonfond, and A. Saglam (2008b), Jupiter's changing auroral location, J. Geophys. Res., 113, A01206, doi:10.1029/2007JA012601.
Grodent, D., B. Bonfond, A. Radioti, J.-C. Gérard, X. Jia, J. D. Nichols, and J. T. Clarke (2009), Auroral footprint of Ganymede, J. Geophys. Res., 114, A07212, doi:10.1029/2009JA014289.
Hess, S., B. Cecconi, and P. Zarka (2008), Modeling of Io-Jupiter decameter arcs, emission beaming and energy source, Geophys. Res. Lett., 35, L13107, doi:10.1029/2008GL033656.
Hess, S., A. Petin, P. Zarka, B. Bonfond, and B. Cecconi (2010a), Lead angles and emitting electron energies of Io-controlled decameter radio arcs, Planet. Space Sci., 58, 1188-1198, doi:10.1016/j.pss.2010.04.011.
Hess, S. L. G., P. Delamere, V. Dols, B. Bonfond, and D. Swift (2010b), Power transmission and particle acceleration along the Io flux tube, J. Geophys. Res., 115, A06205, doi:10.1029/2009JA014928.
Higgins, C. A., T. D. Carr, and F. Reyes (1996), A new determination of Jupiter's radio rotation period, Geophys. Res. Lett., 23, 2653-2656, doi:10.1029/96GL02388. (Pubitemid 126673484)
Higgins, C. A., T. D. Carr, F. Reyes, W. B. Greenman, and G. R. Lebo (1997), A redefinition of Jupiter's rotation period, J. Geophys. Res., 102, 22,033-22,042, doi:10.1029/97JA02090.
Hill, T. W., and V. M. Vasyliunas (2002), Jovian auroral signature of Io's corotational wake, J. Geophys. Res., 107(A12), 1464, doi:10.1029/ 2002JA009514.
Jacobsen, S., F. M. Neubauer, J. Saur, and N. Schilling (2007), Io's nonlinear MHD-wave field in the heterogeneous Jovian magnetosphere, Geophys. Res. Lett., 34, L10202, doi:10.1029/2006GL029187. (Pubitemid 47064799)
Khurana, K. K. (1997), Euler potential models of Jupiter's magnetospheric field, J. Geophys. Res., 102, 11,295-11,306, doi:10.1029/97JA00563. (Pubitemid 127694348)
Khurana, K. K., and H. K. Schwarzl (2005), Global structure of Jupiter's magnetospheric current sheet, J. Geophys. Res., 110, A07227, doi:10.1029/2004JA010757. (Pubitemid 44116593)
Ness, N. F., M. H. Acuna, R. P. Lepping, L. F. Burlaga, K. W. Behannon, and F. M. Neubauer (1979a), Magnetic field studies at Jupiter by Voyager 1: Preliminary results, Science, 204, 982-987.
Ness, N. F., M. H. Acuna, R. P. Lepping, L. F. Burlaga, K. W. Behannon, and F. M. Neubauer (1979b), Magnetic field studies at Jupiter by Voyager 2: Preliminary results, Science, 206, 966-972.
Neubauer, F. M. (1980), Nonlinear standing Alfvén wave current system at Io: Theory, J. Geophys. Res., 85, 1171-1178.
Prangé, R., D. Rego, D. Southwood, P. Zarka, S. Miller, and W. Ip (1996), Rapid energy dissipation and variability of the Io-Jupiter electrodynamic circuit, Nature, 379, 323-325, doi:10.1038/379323a0. (Pubitemid 126554842)
Queinnec, J., and P. Zarka (1998), Io-controlled decameter arcs and Io-Jupiter interaction, J. Geophys. Res., 103, 26,649-26,666, doi:10.1029/98JA02435. (Pubitemid 128664952)
Ray, L. C., and S. Hess (2008), Modelling the Io-related DAM emission by modifying the beaming angle, J. Geophys. Res., 113, A11218, doi:10.1029/ 2008JA013669.
Russell, C. T., Z. J. Yu, K. K. Khurana, and M. G. Kivelson (2001a), Magnetic field changes in the inner magnetosphere of Jupiter, Adv. Space Res., 28, 897-902, doi:10.1016/S0273-1177(01)00513-0. (Pubitemid 34002409)
Russell, C. T., Z. J. Yu, and M. G. Kivelson (2001b), The rotation period of Jupiter, Geophys. Res. Let t . , 28, 1911-1912, doi:10.1029/ 2001GL012917. (Pubitemid 34043183)
Saur, J. (2004), A model of Io's local electric field for a combined Alfvénic and unipolar inductor far-field coupling, J. Geophys. Res., 109, A01210, doi:10.1029/2002JA009354.
Saur, J., F. M. Neubauer, J. E. P. Connerney, P. Zarka, and M. G. Kivelson (2004), Plasma interaction of Io with its plasma torus, in Jupiter: The Planet, Satellites, and Magnetosphere, edited by F. Bagenal, T. E. Dowling, and W. B. McKinnon, pp. 537-560, Cambridge Univ. Press, Cambridge, U. K.
Thomas, N., F. Bagenal, T. W. Hill, and J. K. Wilson (2004), The Io neutral clouds and plasma torus, in Jupiter: The Planet, Satellites, and Magnetosphere, edited by F. Bagenal, T. E. Dowling, and W. B. McKinnon, pp. 561-591, Cambridge Univ. Press, Cambridge, U. K.
Treumann, R. A. (2006), The electron cyclotron maser for astrophysical application, Astron. Astrophys. Rev., 13, 229-315, doi:10.1007/s00159- 006-0001-y. (Pubitemid 44079290)
Wu, C. S. (1985), Kinetic cyclotron and synchrotron maser instabilities- Radio emission processes by direct amplification of radiation, Space Sci. Rev., 41, 215-298.
Zarka, P. (1998), Auroral radio emissions at the outer planets: Observations and theories, J. Geophys. Res., 103, 20,159-20,194, doi:10.1029/ 98JE01323. (Pubitemid 128718567)
Zarka, P. (2004), Fast radio imaging of Jupiter's magnetosphere at lowfrequencies with LOFAR, Planet. Space Sci., 52, 1455-1467.
Zarka, P., J. Queinnec, and F. J. Crary (2001), Low-frequency limit of Jovian radio emissions and implications on source locations and Io plasma wake, Planet. Space Sci., 49, 1137-1149, doi:10.1016/S0032- 0633(01)00021-6. (Pubitemid 32735658)
Zarka, P., D. Langmayr, A. Gerbault, L. Denis, A. Coffre, and F. Korver (2002), Lead angle of Io-controlled radio emission: Alfvén wave or slow shock?, paper presented at Magnetospheres of the Outer Planets Conference, John Hopkins Univ., Columbia, Md.
