Thermal Evolution of Saturn's Springtime Disturbance

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Scientific paper

Saturn's slow seasonal warming was spectacularly disrupted in December 2010 by the eruption of an enormous storm system in its springtime hemisphere. This storm, which is still evolving at the time of writing, is only the sixth known example of a planetwide storm system on Saturn, and the first to occur at this latitude (near 40oN) in over a century [1,2]. A combined analysis of thermal infrared imaging from ESO's Very Large Telescope VISIR instrument and 5-200 μm spectroscopy from instruments onboard Cassini revealed the substantial atmospheric perturbations related to the storm complex over a wide range of altitudes [1]. Since that time the storm complex has continued to evolve through the mature phase. In particular Saturn's newly-identified stratospheric beacons (a high-altitude response to mechanical forcing from the troposphere) have been observed to move in the stratospheric wind field, merge and strengthen to generate thermal differences considerably larger than those reported in our initial study (Fig. 1, from IRTF/MIRSI, May 22 2011).

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