Impact Debris Particles from SL-9: Evolution and Transport After Two Years in Jupiter's Stratosphere

Details Impact Debris Particles from SL-9: Evolution and Transport After Two Years in Jupiter's Stratosphere Impact Debris Particles from SL-9: Evolution and Transport After Two Years in Jupiter's Stratosphere

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.2239w&link_type=abstract

American Astronomical Society, DPS meeting #28, #22.39; Bulletin of the American Astronomical Society, Vol. 28, p.1148

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Particles in Jupiter's stratosphere generated by the impacts from comet Shoemaker-Levy 9 are evident almost two years after the event in ultraviolet (255-nm) images of Jupiter obtained by the Hubble Space Telescope, whereas the haze signature has disappeared in the 889-nm methane band. Particles were transported rapidly (over several months) to latitude -20deg , with very little transport northward of -20deg over the past 1.5 year. The strong jet near latitude -20deg may inhibit mixing toward the equator in the lower stratosphere. The UV reflectivity of Jupiter's south polar region remains low compared to pre-impact imagery. An initial attempt to estimate the total volume of particles, based on the UV reflectivity alone and assuming particle radius (0.25 mu m) and refractive index did not change from estimates made shortly after impact (West et al., Science 267, 1296--1301, 1995) yielded a significant (factor of 3 or more) increase in the number of particles between 1994 and 1996. Most likely the particles have become more absorbing at UV wavelengths while the mean radius has become smaller, consistent with the disappearance at infrared wavelengths and expectations from evolution by sedimentation out of the stratosphere.

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