Absence of an internal magnetic field at Callisto

K. K. Khurana, M. G. Kivelson, C. T. Russell, R. J. Walker and D. J. Southwood
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K. K. Khurana: University of California
M. G. Kivelson: University of California
C. T. Russell: University of California
R. J. Walker: University of California
D. J. Southwood: Imperial College of Science, Technology, and Medicine

Nature, 1997, vol. 387, issue 6630, 262-264

Abstract: Abstract Little is known about the internal properties of Callisto—the outermost of Jupiter's four large galilean moons—other than the average density (about 1.8gem-3). The recent unexpected discovery1–4 that Ganymede, and perhaps Io, has an internally generated magnetic field, combined with gravity results5,6 suggesting that both Ganymede and Io are internally differentiated with metallic cores and rocky mantles, has heightened anticipation of the results obtained by the Galileo spacecraft in its recent fly-by of Callisto. Here we report that the spacecraft, passing the moon at a distance of only ∼1,100 km from the surface, detected only a small enhancement of the field strength (∼7nT), which maybe related to changes in the jovian plasma environment caused by Callisto7. Callisto does not have an internally generated magnetic field.

Date: 1997
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DOI: 10.1038/387262a0

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