We observed the evolution of Jupiter's polar cyclonic structures over two years between February 2017 and February 2019, using polar observations by the Jovian InfraRed Auroral Mapper, JIRAM, on the Juno mission. Images and spectra were collected by the instrument in the 5‐μm wavelength range. The images were used to monitor the development of the cyclonic and anticyclonic structures at latitudes higher than 80° both in the northern and the southern hemispheres. Spectroscopic measurements were then used to monitor the abundances of the minor atmospheric constituents water vapor, ammonia, phosphine, and germane in the polar regions, where the atmospheric optical depth is less than 1. Finally, we performed a comparative analysis with oceanic cyclones on Earth in an attempt to explain the spectral characteristics of the cyclonic structures we observe in Jupiter's polar atmosphere.

中文翻译：

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JIRAM在朱诺号上对木星极区的两年观测

我们使用Jovian InfraRed Auroral Mapper JIRAM进行的Juno任务的极地观测，观察了2017年2月至2019年2月之间两年中木星极地气旋结构的演变。用仪器在5μm波长范围内收集图像和光谱。这些图像用于监测北半球和南半球在高于80°纬度的气旋和反气旋结构的发展。然后，使用光谱测量来监测极地区域中大气光学深度小于1的少量大气成分水蒸气，氨，磷化氢和锗烷的丰度。最后，