Global Context of the Galileo-E6 Observations of Jupiter's White Ovals

Details Global Context of the Galileo-E6 Observations of Jupiter's White Ovals Global Context of the Galileo-E6 Observations of Jupiter's White Ovals

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998icar..135..220s&link_type=abstract

Icarus, Volume 135, Issue Icarus, pp. 220-229.

Physics

19

Scientific paper

Galileo Solid State Imaging (SSI) data taken during the E6 orbit on February 19, 1997 offer a brief, high-resolution glimpse of Jupiter's White Ovals. These data can be used to infer relative cloud heights and systematic rotations over a small area of latitude and longitude (approximately 20 deg by 30 deg) around the White Ovals. To fully understand the behavior of these cloud systems, however, a longer time span of global data is necessary. In this paper, we utilize ground-based Voyager and Hubble Space Telescope data to interpret the Galileo images. We find that the White Ovals' translation rates have slowed from 0.39 deg day^-1 during the Voyager era to 0.13 deg day^-1 in 1996 and they, along with three smaller anticyclonic systems, have coalesced into a system of alternating cyclonic and anticyclonic systems that has not been observed before. The largest of the ovals, BC, is now impeding the eastward motion of the system, causing more rapidly translating anticyclonic cells to catch the system and increase the westward extension of the equally spaced features. Rotational velocities for BC and a small anticyclonic system at 42 degS have also been measured and peak at 120 m sec^-1 for both systems, comparable to the Mitchell et al. (J. Geophys. Res. 86, 8751-8757) measurements of BC and the Great Red Spot (GRS) from Voyager data. The motion of individual features and of the whole system in the ambient wind flow is discussed.

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