The distribution of sulfur dioxide and other infrared absorbers on the surface of Io

被引:78
作者
Carlson, RW
Smythe, WD
LopesGautier, RMC
Davies, AG
Kamp, LW
Mosher, JA
Soderblom, LA
Leader, FE
Mehlman, R
Clark, RN
Fanale, FP
机构
[1] US GEOL SURVEY,FLAGSTAFF,AZ 86001
[2] UNIV CALIF LOS ANGELES,INST GEOPHYS & PLANETARY PHYS,LOS ANGELES,CA 90095
[3] US GEOL SURVEY,DENVER FED CTR,DENVER,CO 80225
[4] UNIV HAWAII,PLANETARY GEOSCI DIV,HONOLULU,HI 96822
关键词
D O I
10.1029/97GL02609
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The Galileo Near Infrared Mapping Spectrometer was used to investigate the distribution and properties of sulfur dioxide over the surface of Io, and qualitative results for the anti-Jove hemisphere sue presented here. SO2, existing as a frost, is found almost everywhere, but with spatially variable concentration. The exceptions are volcanic hot spots, where high surface temperatures promote rapid vaporization and can produce SO2-free areas. The pervasive frost, if fully covering the cold surface, has characteristic grain sizes of 30 to 100 mu m, or greater. Regions of greater sulfur dioxide concentrations are found. The equatorial Colchis Regio area exhibits extensive snowfields with large particles (250 to 500 mu m diameter, or greater) beneath smaller particles. A weak feature at 3.15 mu m is observed and is perhaps due to hydroxides, hydrates, or water. A broad absorption in the 1 mu m region, which could be caused by iron-containing minerals, shows a concentration in Io's southern polar region, with an absence in the Pele plume deposition ring.
引用
收藏
页码:2479 / 2482
页数:4
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