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Science 19 July 1996:
Vol. 273. no. 5273, pp. 341 - 343
DOI: 10.1126/science.273.5273.341
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Reports
Detection of Ozone on Ganymede
Keith S. Noll,
*
Robert E. Johnson,
Arthur
L. Lane,
Deborah L. Domingue,
Harold A. Weaver
An absorption band at 260 nanometers on the trailing hemisphere of
Ganymede, identified as the Hartley band of ozone
(O3), was measured with the Hubble Space Telescope.
The column abundance of ozone, 4.5 × 1016 per square
centimeter, can be produced by ion impacts or by photochemical
equilibrium with previously detected molecular oxygen (O2).
An estimated number density ratio of
[O3]/[O2]  10 4 to
103 requires an atmospheric density orders of magnitude
higher than upper limits from spacecraft occultation experiments.
Apparently, this O2-O3 "atmosphere" is
trapped in Ganymede's surface ice, an inference consistent with
the shift and broadening of the band compared with the gas-phase
O3 band.
K. S. Noll, Space Telescope Science Institute, 3700 San Martin
Drive, Baltimore, MD 21218, USA.
R. E. Johnson, University of Virginia, Nuclear Engineering and
Engineering Physics, Charlottesville, VA 22901, USA.
A. L. Lane, Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena,
CA 91109, USA.
D. L. Domingue, Lunar and Planetary Institute, 3600 Bay Area Boulevard,
Houston, TX 77058, USA.
H. A. Weaver, Johns Hopkins University, Department of Physics and
Astronomy, Baltimore, MD 21218, USA.
*
To whom correspondence should be addressed.
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