火星高层大气的全球循环。

Global circulation of Mars' upper atmosphere.

机构信息

Solar System Exploration Division, NASA Goddard Space Flight Center, Greenbelt, MD, USA.

Center for Space Sciences and Technology, University of Maryland Baltimore County, Baltimore, MD, USA.

出版信息

Science. 2019 Dec 13;366(6471):1363-1366. doi: 10.1126/science.aax1553.

DOI:10.1126/science.aax1553

PMID:31831665

Abstract

The thermosphere of Mars is the interface through which the planet is continuously losing its reservoir of atmospheric volatiles to space. The structure and dynamics of the thermosphere is driven by a global circulation that redistributes the incident energy from the Sun. We report mapping of the global circulation in the thermosphere of Mars with the Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft. The measured neutral winds reveal circulation patterns simpler than those of Earth that persist over changing seasons. The winds exhibit pronounced correlation with the underlying topography owing to orographic gravity waves.

摘要

火星的热层是行星不断向太空流失大气挥发物的界面。热层的结构和动态由全球环流驱动，该环流重新分配来自太阳的入射能量。我们报告了用火星大气和挥发物演化（MAVEN）航天器对火星热层的全球环流进行测绘。测量得到的中性风揭示了比地球更简单的环流模式，这些模式在季节变化中持续存在。由于地形重力波的存在，风与底层地形表现出明显的相关性。