THE DARK SIDE OF VENUS - NEAR-INFRARED IMAGES AND SPECTRA FROM THE ANGLO-AUSTRALIAN-OBSERVATORY

被引:71
作者
CRISP, D
ALLEN, DA
GRINSPOON, DH
POLLACK, JB
机构
[1] ANGLO AUSTRALIAN OBSERV,EPPING,NSW 2121,AUSTRALIA
[2] NASA,AMES RES CTR,MOFFETT FIELD,CA 94035
关键词
D O I
10.1126/science.11538493
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Near-infrared images and spectra of the night side of Venus taken at the Anglo-Australian Telescope during February 1990 reveal four new thermal emission windows at 1.10, 1.18, 1.27, and 1.31 micrometers (mu-m), in addition to the previously discovered windows at 1.74 and 2.3-mu-m. Images of the Venus night side show similar bright and dark markings in all windows, but their contrast is much lower at short wavelengths. The 1.27-mu-m window includes a bright, high-altitude O2 airglow feature in addition to a thermal contribution from the deep atmosphere. Simulations of the 1.27- and 2.3-mu-m spectra indicate water vapor mixing ratios near 40 +/- 20 parts per million by volume between the surface and the cloud base. No large horizontal gradients in the water vapor mixing ratios were detected at these altitudes.
引用
收藏
页码:1263 / 1266
页数:4
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