The upper atmosphere of Venus during morning conditions

被引:115
作者
von Zahn, U. [1 ]
Fricke, K. H. [1 ]
Hunten, D. M. [2 ]
Krankowsky, D. [3 ]
Mauersberger, K. [4 ]
Nier, A. O. [4 ]
机构
[1] Univ Bonn, Inst Phys, Bonn, Germany
[2] Univ Arizona, Dept Planetary Sci, Tucson, AZ 85721 USA
[3] Max Planck Inst Kernphys, Heidelberg, Germany
[4] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA
关键词
D O I
10.1029/JA085iA13p07829
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The structure and composition of the Venus upper atmosphere between 130- and 650-km altitude were measured for a solar zenith angle of approximately 60 degrees by the neutral gas mass spectrometer on board the Pioneer Venus multiprobe bus. Below 180 km a wavelike structure is quite evident in the CO2 and He number density profiles. For altitudes above 100 km a one-dimensional model of the Venus upper atmosphere during morningside conditions (MS model) is presented. Number densities at 150-km altitude are as follows: CO2 = 4.9 x 10(9), N-2 = 1.1 x 10(9), CO = 2.8 x 10(9), and He = 4.8 x 10(6) cm(-3). The exospheric temperature is 275 K. The vertical compositional structure is best described by an eddy coefficient K = 1.4 x 10(13)n(a)(-1/2) cm(2)/s, where n(a) is the total number density in units per cubic centimeter. The homopause altitudes for N-2 and He are at 136 and 130 kin, respectively.
引用
收藏
页码:7829 / 7840
页数:12
相关论文
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