Jovian Ammonia Cloud Identification and Color Analyses from Hyperspectral Imaging

Astronomy and Astrophysics – Astronomy

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Scientific paper

Narrowband visible and near-infrared images of Jupiter were acquired at the Apache Point Observatory 3.5-meter telescope from 26-27 June and 04 July 2007 with the New Mexico State University Acousto-optic Imaging Camera (NAIC) to study atmospheric spectral characteristics. Over 3000 images were collected and map-projected, yielding spectral image cubes that span 480-900 nm with 2 nm resolution (1 nm resolution after deconvolution) and spatially cover 85% of jovian longitudes. We report the detection of spectrally identifiable ammonia clouds (SIACs) through the ammonia absorption features centered at 647 nm and 790 nm, which may be the first identification of SIACs using narrowband visible imaging. The observed SIACs predominately reside in the range of 1° to 4° N latitude (planetographic) and are also found in the turbulent wake region northwest of the Great Red Spot (GRS), which is in agreement with the analysis of Galileo NIMS observations by Baines et al. (2002, Icarus 159, 74-94). SIAC size and spatial distributions and temporal evolution are discussed. Additionally, color analyses were conducted for a jovian chromophore investigation using principle component analysis and nonnegative matrix factorization. Results are compared to a color analysis of HST observations from May-July 2008 of the passage of the GRS and Oval BA (Simon-Miller, this meeting). This work is funded by NSF award AST0628919.

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