✦ LIBER ✦

Shear Instabilities as a Probe of Jupiter's Atmosphere

✍ Scribed by Tanja Bosak; Andrew P. Ingersoll

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 195 KB
Volume: 158
Category: Article
ISSN: 0019-1035
DOI: 10.1006/icar.2002.6886

No coin nor oath required. For personal study only.

✦ Synopsis

We propose that the preferred wavelength is related to the thickness of an unstable shear layer within the clouds (A. P. Ingersoll and D. W. Koerner 1989, Bull. Am. Astron. Soc. 21, 943). We numerically analyze the linear stability of wavelike disturbances that have nonzero horizontal phase speeds in Jupiter's atmosphere and find that, if the static stability in the shear layer is very low (but still nonnegative), a deep vertical shear layer like the one measured by the Galileo probe (D. H. Atkinson et al. 1998, J. Geophys. Res. 103, 22911-22928) can generate the instabilities. The fastest growing waves grow exponentially within an hour, and their wavelengths match the observations. Close to zero values of static stability that permit the growth of instabilities are within the range of values measured by the Galileo probe in a hot spot (A. Seiff et al. 1998, J. Geophys. Res. 103, 22857-22889). Our model probes Jupiter's equatorial atmosphere below the cloud deck and suggests that thick regions of wind shear and low static stability exist outside hot spots.

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