Publication Abstracts
Rathbun et al. 2004
Rathbun, J.A., J.R. Spencer, L.K. Tamppari, T.Z. Martin, L. Barnard, and
, 2004: Mapping of Io's thermal radiation by the Galileo photopolarimeter-radiometer (PPR) instrument. Icarus, 169, 127-139, doi:10.1016/j.icarus.2003.12.021.Between 1999 and 2002, the Galileo spacecraft made 6, close flybys of to during which many observations of Io's thermal radiation were made with the photopolarimeter-radiometer (PPR). While the NIMS instrument could measure thermal emission from hot spots with T > 200 K, PPR was the only Galileo instrument capable of mapping the lower temperatures of older, cooling lava flows, and the passive background. We tabulate all data taken by PPR of Io during these flybys and describe some scientific highlights revealed by the data. The data include almost complete coverage of Io at better than 250 km resolution, with extensive regional coverage at higher resolutions. We found a modest poleward drop in nighttime background temperatures and evidence of thermal inertia variations across the surface. Comparison of high spatial resolution temperature measurements with observed daytime SO2 gas pressures on Io provides evidence for local cold trapping of SO2 frost on scales smaller than the 60 km resolution of the PPR data. We also calculated the power output from several hot spots and estimated total global heat flow to be about 2.0-2.6 W m-2. The low-latitude diurnal temperature variations for the regions between obvious hot spots are well matched by a laterally-inhomogeneous thermal model with less than 1 W m-2 endogenic heat flow.
- Get PDF (782 kB)
- PDF documents require the free Adobe Reader or compatible viewing software to be viewed.
- Go to journal article webpage
Export citation: [ BibTeX ] [ RIS ]
BibTeX Citation
@article{ra08300g, author={Rathbun, J. A. and Spencer, J. R. and Tamppari, L. K. and Martin, T. Z. and Barnard, L. and Travis, L. D.}, title={Mapping of Io's thermal radiation by the Galileo photopolarimeter-radiometer (PPR) instrument}, year={2004}, journal={Icarus}, volume={169}, pages={127--139}, doi={10.1016/j.icarus.2003.12.021}, }
[ Close ]
RIS Citation
TY - JOUR ID - ra08300g AU - Rathbun, J. A. AU - Spencer, J. R. AU - Tamppari, L. K. AU - Martin, T. Z. AU - Barnard, L. AU - Travis, L. D. PY - 2004 TI - Mapping of Io's thermal radiation by the Galileo photopolarimeter-radiometer (PPR) instrument JA - Icarus JO - Icarus VL - 169 SP - 127 EP - 139 DO - 10.1016/j.icarus.2003.12.021 ER -
[ Close ]