Jovian Stratospheric Hazes --- the View from Galileo

Details Jovian Stratospheric Hazes --- the View from Galileo Jovian Stratospheric Hazes --- the View from Galileo

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997dps....29.1917r&link_type=abstract

American Astronomical Society, DPS meeting #29, #19.17; Bulletin of the American Astronomical Society, Vol. 29, p.1008

Astronomy and Astrophysics

Astronomy

Scientific paper

During the E4 orbit in December 1996, Galileo obtained eight images of Jupiter's limb --- at latitudes of 8deg N and 60deg N, at phase angles of 146deg and 157deg , and in violet (407 nm) and NIR continuum (756 nm) filters. Stratospheric hazes are present at both latitudes. The hazes at 8deg N are more or less uniformly mixed with the gas, as are the hazes at 60deg N, 295deg W (the location probed at 157deg phase angle). However, a discrete haze layer is clearly visible above Jupiter's limb at 60deg N, 315deg W (the location probed at 146deg phase angle). The extinction coefficient of this discrete haze layer decreases by a factor of ~ 5 between 407 nm and 756 nm, indicating that the mean particle size in this layer is ~ 0.1 mu m. The discrete layer is at a pressure no higher than ~ 10 mbar. The combined gas/haze single scattering phase function at the point where the atmosphere becomes optically thick (the ``main limb'') varies with latitude, and so far efforts to fit both the violet and NIR filters using a common haze particle size have failed, indicating a change in haze particle properties between the altitudes probed (<_{ ~ }40 mbar in violet and <_{ ~ }100 mbar in NIR).

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