Cassini CIRS Observations of Thermal Waves on Jupiter

Details Cassini CIRS Observations of Thermal Waves on Jupiter Cassini CIRS Observations of Thermal Waves on Jupiter

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001dps....33.0904a&link_type=abstract

American Astronomical Society, DPS Meeting #33, #09.04; Bulletin of the American Astronomical Society, Vol. 33, p.1035

Astronomy and Astrophysics

Astronomy

Scientific paper

During early January, 2001, four global mapping sequences of Jupiter were obtained using the Composite Infrared Spectrometer (CIRS) on the Cassini spacecraft. Spectra were obtained over the entire globe in the wavenumber range from 600 cm-1 to 1400 cm-1 with a spatial resolution of 3 cm-1 and a spatial resolution of approximately 3o of great circle arc. Spectra with emission angles less than 75o were inverted by a constrained linear inversion method to obtain temperatures in the upper troposphere (100 mbar -- 400 mbar) and stratosphere (1 mbar -- 10 mbar). Deviations of the temperatures from the zonal mean for each of the maps were grouped into 5 degree latitude bins, and a Lomb-Scargle periodogram analysis applied to each latitude bin for pressures of 214, 10, 3, and 1 mbar. For significant waves, amplitude and phase as a function of latitude are determined by least-squares fitting. In contrast to results from Voyager IRIS maps, which were dominated by zonal wavenumber 1 (e.g. Magalhães et al. Icarus, 88, 39--72, 1990), the Cassini maps are dominated by zonal wavenumber 2, with wavenumbers 1 through 4 statistically significant at various latitudes. Significant waves are also seen at higher wavenumbers, particularly wavenumber 10 near the equator at 10 mbar, and wavenumber 14 around 15oN at 214 mbar. With the exception of wavenumbers 1 and 2 near 30oN, there appears to be very little correlation of wave features at the different pressure levels examined.

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