Dynamics and evolution of SO2 gas condensation around Prometheus-like volcanic plumes on Io as seen by the Near Infrared Mapping Spectrometer

Details Dynamics and evolution of SO2 gas condensation around Prometheus-like volcanic plumes on Io as seen by the Near Infrared Mapping Spectrometer Dynamics and evolution of SO2 gas condensation around Prometheus-like volcanic plumes on Io as seen by the Near Infrared Mapping Spectrometer

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000dps....32.6517d&link_type=abstract

American Astronomical Society, DPS Meeting #32, #65.17; Bulletin of the American Astronomical Society, Vol. 32, p.1642

Astronomy and Astrophysics

Astronomy

Scientific paper

In October 1999, November 1999 and February 2000, Galileo accomplished three successful flybys (I24, I25, I27) of Io, during which the Near Infrared Mapping Spectrometer (NIMS) made local as well as regional observations. Spectral image cubes of active volcanic centers (e.g. Prometheus, Amirani etc. ) and areas targeted for their unique colorimetry were obtained with variable spatial resolution (from 6 km/pixel-1 to 26 km/pixel-1). Most NIMS spectra (from 1.0 μ m to 4.5 μ m) display two prominent and broad features centered respectively at 1.2 μ m and 4.13 μ m. The latter absorption is attributed to frosts of sulfur dioxide (SO2). In an effort to understand the dynamics and evolution of gas condensation around volcanic plumes, we present maps of SO2 abundance and granularity on the surface around Prometheus and Amirani. Reduction of NIMS spectral sampling (from 408 to 14 wavelengths) during the flybys prevents direct modeling of spectra using a bidirectional reflectance model (Douté et al., 2000). Nevertheless, comparison between an I24 global observation with previous SO2 abundance and granularity maps covering 3/4 of Io's surface indicates good correlation between two spectral ratios: α ={R}obs}(3.28)/{R}{obs(4.13), β ={R}obs}(3.28)/{R}{obs(3.56) and, respectively, the areal abundance of the frost fSO{2} and its mean grain size DSO{2}. We use a derivative of a classical reflectance model to quantify these dependencies and to invert the data. As a result, maps of SO2 abundance and granularity are obtained which can be correlated to distinguish four different physical units. The distribution of these SO2 units indicates zones of condensation, metamorphism and sublimation linked with the dynamics of volcanic gases, thermal emission and solar flux. This work is supported by a contract with NASA through the Jupiter System Data Analysis Program.

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