Jovian Stratospheric Hazes: The High Phase Angle View from Galileo

Details Jovian Stratospheric Hazes: The High Phase Angle View from Galileo Jovian Stratospheric Hazes: The High Phase Angle View from Galileo

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icar..139..211r&link_type=abstract

Icarus, Volume 139, Issue Icarus, pp. 211-226.

Physics

15

Scientific paper

High phase angle Galileo images of Jupiter's limb reveal the presence of stratospheric hazes in the equatorial region (latitude 9 degN) and the transition zone at the southern edge of the north polar region (60 degN). During orbit E4, images were taken in both violet and near-IR continuum filters, effectively probing Jupiter's stratosphere at two different altitudes. A discrete layer detached from the limb is present at 60 degN, 315 degW, but not 20 deg further east at 60 degN, 295 degW. Bright streaks running roughly north-south are also present on Jupiter's crescent at 60 degN. No such discrete features have been seen previously in high phase angle images of the giant planets. Nor are such features seen at 9 degN, where the haze appears to be more uniformly distributed in height and longitude. Radial intensity profiles across the limb are inverted to give vertical extinction profiles over ~200 km in Jupiter's stratosphere. These show that extinction in the discrete haze layer is enhanced by a factor of ~2 over its surroundings in the violet filter, with less pronounced variation in the near-IR filter. Haze distribution models were found for both latitudes in which the near-IR images constrain the haze properties near or above the 100-mbar pressure level, where the mean particle radius is about 0.45 μm and the haze number density is near 0.15 cm^-3. In these models the violet images constrain the haze properties about 25 km higher in the atmosphere, near or above the 20-mbar pressure level, where the haze particle size is 0.32+/-0.01 μm at 9 degN and 0.27+/-0.01 μm at 60 degN. At this altitude, the haze number density increases by almost an order of magnitude between the equator and the polar transition region-from 0.1 cm^-3 at 9 degN to 0.7 cm^-3 at 60 degN. An alternative solution is possible at 60 degN, in which the haze is placed near 1 mbar in both filters, with mean particle sizes of 0.6 μm in the violet and 1.3 μm in the near IR.

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