SPECTROSCOPIC OBSERVATIONS OF BRIGHT AND DARK EMISSION FEATURES ON THE NIGHT SIDE OF VENUS

被引:29
作者
BELL, JF
CRISP, D
LUCEY, PG
OZOROSKI, TA
SINTON, WM
WILLIS, SC
CAMPBELL, BA
机构
[1] UNIV WASHINGTON,REMOTE SENSING LAB,SEATTLE,WA 98195
[2] CALTECH,JET PROP LAB,PASADENA,CA 91109
[3] CALTECH,PASADENA,CA 91109
[4] UNIV HAWAII,INST ASTRON,HONOLULU,HI 96822
[5] UNIV HAWAII,INFRARED TELESCOPE FACIL,HONOLULU,HI 96822
关键词
D O I
10.1126/science.252.5010.1293
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 spectra of a bright and a dark thermal emission feature on the night side of Venus have been obtained from 2.2 to 2.5 micrometers (mu-m) at a spectral resolution of 1200 to 1500. Both bright and dark features show numerous weak absorption bands produced by CO2, CO, water vapor, and other gases. The bright feature (hot spot) emits more radiation than the dark feature (cold spot) throughout this spectral region, but the largest contrasts occur between 2.21 and 2.32-mu-m, where H2SO4 clouds and a weak CO2 band provide the only known sources of extinction. The contrast decreases by 55 to 65 percent at wavelengths longer than 2.34-mu-m, where CO, clouds, and water vapor also absorb and scatter upwelling radiation. This contrast reduction may provide direct spectroscopic evidence for horizontal variations in the water vapor concentrations in the Venus atmosphere at levels below the cloud tops.
引用
收藏
页码:1293 / 1296
页数:4
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