Other
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.5002o&link_type=abstract
American Astronomical Society, DPS meeting #40, #50.02; Bulletin of the American Astronomical Society, Vol. 40, p.487
Other
Scientific paper
Thermal-infrared observations of the close passage of Jupiter's Great Red Spot and Oval BA serendipitously observed their interaction with a smaller and younger red anticyclone in late June through August of 2008. Filtered radiometric images were obtained at the NASA IRTF's MIRSI instrument at 7.85 - 24.5 microns, together with imaging between 8.8 and 24.5 microns and 7-14 micron spectroscopy at higher spatial resolution with the Subaru Telescope COMICS and the Very Large Telescope (Melipal) VISIR instruments over several nights in this time frame. The data were acquired during regularly scheduled observations at the IRTF and Subaru, service time at the VLT, and VLT target-of-opportunity observations triggered by this event. We derive maps of temperature structure in the 100-400 mbar range, variations of the para-hydrogen fraction and ammonia gas abundance near 300 mbar, and relative cloud opacities at the 600-mbar level and deeper. Before the interaction, the small red spot is clearly identified as a well-defined anticyclone with strongly-defined boundaries of peripheral subsidence and a cold and cloudy central upwelling. Drifting eastward toward the Great Red Spot, it was captured in the periphery of southbound flow around the GRS around July 1 and was recognizable over the next few days as a narrow, cold cloud feature, stretched around the GRS south periphery. The data suggest that a portion of it became entrained in the GRS itself and formed a very elongated and nearly spiral feature, while another portion remained outside the GRS and temporarily reformed to its east, accompanied by smaller fragments. As of this writing, the event is still taking place, and conclusions are tentative. Variations of tropospheric properties will be scrutinized and compared with prior conditions, as well as visible color changes and near-infrared tracking of upper-tropospheric particulates.
Chanover Nancy
Edkins E.
Fletcher Leigh N.
Fujiyoshi Takuya
Fuse Takahiro
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