Oscillation of Venus' upper atmosphere
Oscillation of Venus' upper atmosphere
复制标题
金星高层大气的振荡
DOI：
10.1029/2007gl029252
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发表时间：
2007
影响因子：
5.2
通讯作者：
A. Konopliv
中科院分区：
文献类型：
--
作者：
J. Forbes;A. Konopliv
人们对金星上层大气的可变性知之甚少。我们报告发现了一个大的(∼±30-50%)9天周期密度振荡，这是从92年9月15日到93年5月24日对麦哲伦航天器的雷达跟踪得出的。密度对应于海拔164-184公里，北纬11°，覆盖当地所有时间。据推测，该波从低层大气区域向上传播，主要发生在黄昏到午夜之间，这表明强迫和/或平均风过滤的当地时差正在影响高层大气的可获得性。讨论了波的可能来源，包括波与波的相互作用。关于9天振荡的来源和性质，包括其持续性，仍然存在许多问题。现在环绕金星运行的金星快车上的仪器有机会进一步阐明这一9天的波动，并了解它在金星高层大气动力学中的作用。
Little is known about the variability of Venus' upper atmosphere. We report discovery of a large (∼ ±30–50%) 9‐day period density oscillation, derived from radar tracking of the Magellan spacecraft from 15 Sept 92 – 24 May 93. The densities correspond to 164–184 km altitude, 11°N latitude, and cover all local times. The wave is presumed to propagate upward from lower atmosphere regions, and occurs mainly between dusk and midnight, suggesting that local time differences in forcing and/or mean wind filtering are affecting accessibility to the upper atmosphere. Possible sources for the wave are discussed, including wave‐wave interactions. Many questions remain concerning the origin and nature of the 9‐day oscillation, including its persistence. Instruments on Venus Express, now orbiting Venus, have the opportunity to further elucidate the 9‐day wave and understand its role in the dynamics of Venus' upper atmosphere.