Brightness Spectral Distribution in Jupiter's Clouds

Details Brightness Spectral Distribution in Jupiter's Clouds Brightness Spectral Distribution in Jupiter's Clouds

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.1907b&link_type=abstract

American Astronomical Society, DPS meeting #39, #19.07; Bulletin of the American Astronomical Society, Vol. 39, p.445

Astronomy and Astrophysics

Astronomy

Scientific paper

The morphology of cloud forms in Jupiter's atmosphere is rich in a variety of temporal and spatial scales. Analysis of their brightness distribution can be used as diagnose of the turbulence spectrum in Jupiter's atmosphere. We have used Hubble Space Telescope images at wavelength of 953 nm continuum filter sensitive to the upper ammonia cloud obtained since 1994 to study the spectral brightness distribution on the planet. We constructed complete cylindrical map projections (360° wide) corrected for limb-darkening using a Minnaert photometric law. Zonal brightness scans with a resolution of 0.1 deg in latitude have been obtained at selected temporal intervals, averaged in 1 deg bins and analyzed in terms of their power spectra. We show a complete study of the slopes in two spectral ranges (wavenumber intervals) and as a function of latitude, up to wavenumber 150. A comparison with the zonal wind profile and large-scale features is performed. The brightness power spectra are expected to be representative of the kinetic energy spectrum, indirectly providing information on the energy distribution between different spatial scales.
Acknowledgments: This work was supported by the Spanish MEC-PNAYA. N. Barrado-Izagirre acknowledges a fellowship from UPV/EHU.

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