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Science 18 October 1996:
Vol. 274. no. 5286, pp. 396 - 398
DOI: 10.1126/science.274.5286.396
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Reports

Io's Interaction with the Plasma Torus: Galileo Magnetometer Report

M. G. Kivelson, K. K. Khurana, R. J. Walker, J. Warnecke, C. T. Russell, J. A. Linker, D. J. Southwood, C. Polanskey

Galileo magnetometer data at 0.22-second resolution reveal a complex interaction between Io and the flowing plasma of the Io torus. The highly structured magnetic field depression across the downstream wake, although consistent with a magnetized Io, is modified by sources of currents within the plasma that introduce ambiguity into the interpretation of the signature. Highly monochromatic ion cyclotron waves appear to be correlated with the local neutral particle density. The power peaks in the range of molecular ion gyrofrequencies, suggesting that molecules from Io can remain undissociated over a region of more than 15 Io radii around Io.

M. G. Kivelson, K. K. Khurana, R. J. Walker, J. Warnecke, C. T. Russell, Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, USA.
J. A. Linker, Science Applications International Corporation, San Diego, CA 92171, USA.
D. J. Southwood, Department of Physics, Imperial College of Science, Technology, and Medicine, London SW7 2BZ, UK.
C. Polanskey, Jet Propulsion Laboratory, Pasadena, CA 91109, USA.

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Detection of SO in Io's Exosphere.
C. T. Russell and M. G. Kivelson (2000)
Science 287, 1998-1999
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Far-Ultraviolet Imaging Spectroscopy of Io's Atmosphere with HST/STIS.
F. L. Roesler, H. W. Moos, R. J. Oliversen, R. C. Woodward Jr., K. D. Retherford, F. Scherb, M. A. McGrath, W. H. Smyth, P. D. Feldman, and D. F. Strobel (1999)
Science 283, 353-357
   Abstract »    Full Text »
Europa's Magnetic Signature: Report from Galileo's Pass on 19 December 1996 .
M. G. Kivelson, K. K. Khurana, S. Joy, C. T. Russell, D. J. Southwood, R. J. Walker, and C. Polanskey (1997)
Science 276, 1239-1241
   Abstract »    Full Text »
Magnetoconvection Dynamos and the Magnetic Fields of Io and Ganymede.
G. R. Sarson, C. A. Jones, K. Zhang, and G. Schubert (1997)
Science 276, 1106-1108
   Abstract »    Full Text »
Far-Ultraviolet Imaging of Jupiter's Aurora and the Io "Footprint".
J. T. Clarke, G. E. Ballester, J. Trauger, R. Evans, J. E. P. Connerney, K. Stapelfeldt, D. Crisp, P. D. Feldman, C. J. Burrows, S. Casertano, et al. (1996)
Science 274, 404-409
   Abstract »    Full Text »


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