Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm12a0829j&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM12A-0829
Physics
2716 Energetic Particles, Precipitating, 2724 Magnetopause, Cusp, And Boundary Layers, 2740 Magnetospheric Configuration And Dynamics, 5443 Magnetospheres (2756)
Scientific paper
Magnetic field data from Pioneers 10 and 11 have been used to develop a model magnetosphere for Jupiter consisting of an offset, tilted planetary dipole, a bent and twisted current disc represented by an array of concentric current rings, a dayside tail-like dusk-dawn current sheet, and an image dipole (Jones et al, 1980; Jones et al., 1981, Thomas and Jones, 1984). Such a model also fits the Ulysses magnetic field data as well (Jones et al., 1993). In all cases, the magnetosphere has a low latitude cusp. In this paper we compare the model magnetosphere shape and cusp location with the location of periodic energetic particle bursts observed by outbound Pioneer 11 (Fillius, 1976). It is found that the observed peaks occur very near the model cusp field lines, suggesting that this is where energetic particles leave the magnetosphere to propagate on interplanetary magnetic field lines connecting Jupiter with the sun (Conlon et al., 1974). Moiroka and Tsuchiya (1996) have found that the release of energetic electrons is controlled by the solar wind at Jupiter, as expected if they are released at the cusps. D.L. Chenette, T. F. Conlon, and J. A. Simpson, Bursts of relativistic electrons from Jupiter observed in interplanetary space with the time variations of the planetary rotation period, J. Geophys. Res., 79, 3551-3558, 1974 D. E. Jones, J. G. Melville II, and M. L. Blake, Modeling Jupiter's current disc: Pioneer 10 outbound, J. Geophys. Res., 85, 3329, 1980. D. E. Jones, B. T. Thomas, Equatorial disk and dawn-dusk currents in the frontside magnetosphere of Jupiter: Pioneers 10 and 11, J. Geophys. Res., 86, 1738, 1981. B. T. Thomas and D. E. Jones, Modeling Jupiter's magnetospheric currents using Pioneer data: Evidence for a low-latitude cusp, J. Geophys. Res., 89, 6663, 1984. D. E. Jones, E. J. Smith, N. Murphy, D. Winterhalter, A. Balogh, and D. J. Southwood, A model Jovian magnetospheric current system based upon magnetic field data obtained by the Ulysses helium vapor magnetometer, EOS, 74, 529,1993. W. Filius, The trapped radiation belts of Jupiter, in Jupiter, edited by T.Gehrels, p. 896, University of Arizona Press, Tucson, 1976. F. Tsuchiya, A. Morioka, and H Misawa, Jovian electron modulations by the solar wind interaction with the magnetosphere, Earth Planets Space, 51, 987, 1996.
Jones Erica D.
Murphy Neil
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