The Continuing Evolution of the Interaction of a Large Red Oval with the Great Red Spot and Oval BA in May - August 2008: Near-Infrared Properties

Details The Continuing Evolution of the Interaction of a Large Red Oval with the Great Red Spot and Oval BA in May - August 2008: Near-Infrared Properties The Continuing Evolution of the Interaction of a Large Red Oval with the Great Red Spot and Oval BA in May - August 2008: Near-Infrared Properties

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.4103y&link_type=abstract

American Astronomical Society, DPS meeting #40, #41.03; Bulletin of the American Astronomical Society, Vol. 40, p.469

Physics

Optics

Scientific paper

We acquired near- and mid-infrared observations via a coordinated global campaign to observe the close encounter between the Great Red Spot and Oval BA, involving NASA/InfraRed Telescope Facility (IRTF)(NSFCAM2/MIRSI), Telescopio Nazionale Galileo (TNG)/NICS (with adaptive optics), Very Large Telescope (VLT)/VISIR, NOAJ/Subaru/COMICS and UKIRT/UIST (with tip-tilt). We focus on near-infrared observations where the longest-lasting changes to the atmosphere occurred and report on the evolution of a large red anticyclonic vortex that passed between them because of the unexpected nature of the event. The interaction started late June 2008. After being squeezed between the much larger GRS and Oval BA 1-3 July 2008, the large red oval emerged slightly north of its pre-interaction latitude, indicating that the nature of the passage may have occurred at higher altitudes. By 10 July 2008, remnants of the red oval were still recognizable as a distinct feature as high-altitude particles in the near infrared. The red oval and Oval BA continued to drift eastward of the GRS. Some peripheral material from the red oval appeared to have become entrained around the GRS northern boundary. By 27 July 2008, the GRS and Oval BA were still observable at as relatively bright, discrete features in the reflected sunlight, with only the GRS showing a bright 4.78-micron annulus. However, the pre-encounter 4.78-micron bright annulus of the large red oval was not detectable. In reflected sunlight from upper-atmospheric particulates, the large red oval had evolved into a main core, accompanied by a number of small discrete features, quasi-evenly located between the main core and the northeast quadrant of the GRS. The GRS-Oval BA-large red oval complex continues to evolve in the near-infrared. As of this writing, we continue to acquire further observations of the three-oval complex.

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