Correlative Analysis of the Interaction of a Large Red Oval with the Great Red Spot and Oval BA in May - August 2008: Local Meteorology

Details Correlative Analysis of the Interaction of a Large Red Oval with the Great Red Spot and Oval BA in May - August 2008: Local Meteorology Correlative Analysis of the Interaction of a Large Red Oval with the Great Red Spot and Oval BA in May - August 2008: Local Meteorology

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p11a1257y&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #P11A-1257

Physics

Optics

0343 Planetary Atmospheres (5210, 5405, 5704), 5704 Atmospheres (0343, 1060)

Scientific paper

We acquired visible, near- and mid-infrared observations via a coordinated global campaign to observe the close encounter between the Great Red Spot and Oval BA, involving Hubble Space Telescope (HST), 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). Although initial results indicate that changes in the albedo of the visible cloud deck and thermal field in the troposphere recovered shortly after the passage of the large red anticyclonic oval between the GRS and Oval BA, at near-infrared wavelengths, changes in the atmosphere are still occurring (as of this writing). The interaction started late June 2008. The small red oval, drifting eastward toward the GRS, was entrained in the peripheral flow south of the GRS. After being squeezed between the GRS and Oval BA, the elongated large red oval emerged, with part of it following a spiral path as it was entrained in the northern flow around the GRS, while another portion reformed itself 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. 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. We shall present correlative analysis of the local meteorology of the interaction in terms of variations of the wind field, spectral composition, and tropospheric properties and compare with similar properties prior to the current interaction.

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