Planetary ENA Imaging: Venus and a comparison with Mars

H. Guneli; M. Holmstroem; H.K. Biernat; N.V. Erkaev

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Planetary ENA Imaging: Venus and a comparison with Mars

机译：ENA行星成像：金星和与火星的比较

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We present simulated images of energetic neutral atoms (ENAs) produced in charge exchange collisions between solar wind protons and neutral atoms in the exosphere of Venus, and make a comparison with earlier results for Mars. The images are found to be dominated by two local maxima. One produced by charge exchange collisions in the solar wind, upstream of the bow shock, and the other close to the dayside ionopause. The simulated ENA fluxes at Venus are lower than those obtained in similar simulations of ENA images at Mars at solar minimum conditions, and close to the fluxes at Mars at solar maximum. Our numerical study shows that the ENA flux decreases with an increasing ionopause altitude. The influence of the Venus nighttime hydrogen bulge on the ENA emission is small.

机译：我们展示了金星外层中太阳风质子与中性原子之间的电荷交换碰撞中产生的高能中性原子（ENA）的模拟图像，并与火星的早期结果进行了比较。发现图像由两个局部最大值主导。一种是由弓箭冲击上游的太阳风中的电荷交换碰撞产生的，另一种是靠近日间离子绝经的。金星处的模拟ENA通量低于在太阳最低条件下火星上的ENA图像的类似模拟中获得的通量，并且接近太阳最高条件下在火星上的通量。我们的数值研究表明，ENA通量随着电离层高度的增加而降低。金星夜间氢膨胀对ENA排放的影响很小。

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来源
《Planetary and space science》 |2005年第4期|p.433-441|共9页
作者
H. Guneli; M. Holmstroem; H.K. Biernat; N.V. Erkaev;
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作者单位

Swedish Institute of Space Physics, Box 812, SE-981 28 Kiruna, Sweden;

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原文格式 PDF
正文语种 eng
中图分类天文学、地球科学;
关键词
magnetohydrodynamic and fluid equation; venus; mars; neutral atmospheres;

机译：磁流体动力学和流体方程;金星;火星;中性大气;

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Planetary ENA Imaging: Venus and a comparison with Mars

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