Planetary-Scale Waves Seen in Thermal Infrared Images of Venusian Cloud Top
Planetary-Scale Waves Seen in Thermal Infrared Images of Venusian Cloud Top
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DOI：
10.1029/2021je007047
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发表时间：
2021-12-01
影响因子：
4.8
通讯作者：
Kouyama, Toru
中科院分区：
文献类型：
--
作者：
Kajiwara, Naoya;Imamura, Takeshi;Kouyama, Toru
行星尺度的波被认为在维持金星的大气循环中起着至关重要的作用。它们主要是用紫外图像来研究的。在这项研究中，云顶温度振荡与行星尺度波相关，提取自由JAXA赤月航天器上的长波红外相机在142个地球日拍摄的热图像。光谱分析表明，多个行星尺度的波重叠。研究了周期分别为3.6、5.0、5.4和6.1 d的4种不同波的纬向结构。3.6天的波被认为是开尔文波，其他波被认为是半对称的罗斯比波。虽然罗斯比波具有相似的周期，但它们的纬向结构不同。基于与解析解的比较，认为罗斯比波起源于不同的源。
Planetary-scale waves are thought to play a crucial role in the maintenance of the atmospheric circulation of Venus. They have been mainly studied using ultraviolet images. In this study, cloud top temperature oscillations associated with planetary-scale waves were extracted from thermal images taken over 142 Earth days by the Longwave Infrared Camera onboard JAXA's Akatsuki spacecraft. A spectral analysis showed that multiple planetary-scale waves overlap. The latitudinal structures of four distinct waves with periods of 3.6, 5.0, 5.4, and 6.1 days were studied. The 3.6-day wave is considered to be a Kelvin wave and the other waves are considered to be hemispherically symmetric Rossby waves. Although the Rossby waves have similar periods, their latitudinal structures are different. The Rossby waves are considered to originate from different sources based on a comparison with analytical solutions.