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Science 11 September 1992:
Vol. 257. no. 5076, pp. 1510 - 1512
DOI: 10.1126/science.257.5076.1510
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Articles

Imaging Obsearvations of Jupiter's Sodium Magneto-Nebula During the Ulysses Encounter

Michael Mendillo 1, Brian Flynn 1, and Jeffrey Baumgardner 1

1 Boston University, Center for Space Physics, 725 Commonwealth Avenue, Boston, MA 02215

Jupiter's great sodium nebula represents the largest visible structure traversed by the Ulysses spacecraft during its encounter with the planet in February 1992. Ground-based imaging conducted on Mount Haleakala, Hawaii, revealed a nebula that extended to at least ±300 Jovian radii (spanning sim50 million kilometers); it was somewhat smaller in scale and less bright than previously observed. Analysis of observations and results of modeling studies suggest reduced volcanic activity on the moon lo, higher ion temperatures in the plasma torus, lower total plasma content in the torus, and fast neutral atomic clouds along the Ulysses inbound trajectory through the magnetosphere. Far fewer neutrals were encountered by the spacecraft along its postencounter, out-of-ecliptic trajectory.

Submitted on May 29, 1992
Accepted on July 31, 1992

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Science. ISSN 0036-8075 (print), 1095-9203 (online)