Physics
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007hst..prop11102d&link_type=abstract
HST Proposal ID #11102. Cycle 16
Physics
Scientific paper
In the past year, there have been striking changes in Jupiter's atmosphere. Among these are the Oval BA's change from white to red, two new dark Disturbances in the southern hemisphere, and a 30% change since 1997 in the aspect ratio of the potential vorticity anomaly of the GRS not just its associated clouds, as we determined from high-accuracy velocities extracted from HST images. The determination of high-accuracy velocities requires both high-resolution imaging by HST or flybys, and our novel adaptation of Correlation Image Velocimetry CIV, a technique that has far greater accuracy than the traditional method of identifying velocity tie-points by hand. Our proposed observations will test the hypothesis that these changes in Jupiter validate our 2004 prediction: that the merger of the 3 White Ovals in 1998-2000 would lead to climate change on Jupiter. The key is to determine, by indirect means, the temperature at the base of the weather layer, a quantity that cannot be observed directly at any wavelength. The new Red Oval BA's velocities will be used to test our finding that the color change is due to global temperature changes. The change in the GRS's aspect ratio suggests a large at least 20% change in the shear of the local velocity since 1997. The latter can be investigated only by determining Jupiter's current zonal winds.;
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