论文标题
木星极性旋风的振荡运动来自涡旋动力学
The Oscillatory Motion of Jupiter's Polar Cyclones Results From Vorticity Dynamics
论文作者
论文摘要
木星南极的极性旋风和周围的五个旋风旋转的位置和相互作用。这些气旋从NASA的Juno任务开始自2016年以来观察到，这是一个独特的机会，可以在长期尺度上研究涡流动力学和相互作用。分析了Juno的JIRAM仪器获得的旋风分子位置数据，显示出约12个月的振荡，幅度约为12个月，幅度约为400 km。在这里，通过考虑旋风与行星涡度中旋风与纬度变化产生的涡度梯度来揭示了驱动这些振荡的机制。这些力的数据驱动估计与测得的旋风加速度具有很高的相关性。为了进一步测试该机制，构建了一个模型，模拟了旋风如何受到这些力表现出相似的振荡运动。
The polar cyclone at Jupiter's south pole and the five cyclones surrounding it oscillate in position and interact. These cyclones, observed since 2016 by NASA's Juno mission, present a unique opportunity to study vortex dynamics and interactions on long time scales. The cyclones' position data, acquired by Juno's JIRAM instrument, is analyzed, showing dominant oscillations with ~12 month periods and amplitudes of ~400 km. Here, the mechanism driving these oscillations is revealed by considering vorticity-gradient forces generated by mutual interactions between the cyclones and the latitudinal variation in planetary vorticity. Data-driven estimation of these forces exhibits a high correlation with the measured acceleration of the cyclones. To further test this mechanism, a model is constructed, simulating how cyclones subject to these forces exhibit similar oscillatory motion.
