Changes in Jupiter’s Zonal Wind Profile preceding and during the Juno mission
Changes in Jupiter’s Zonal Wind Profile preceding and during the Juno mission
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朱诺号任务之前和期间木星纬向风廓线的变化
DOI：
10.1016/j.icarus.2017.06.007
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发表时间：
2017
期刊：
影响因子：
3.2
通讯作者：
P. Marcus
中科院分区：
文献类型：
--
作者：
J. Tollefson;M. Wong;I. Pater;A. Simon;G. Orton;J. Rogers;S. Atreya;R. Cosentino;W. Januszewski;R. Morales;P. Marcus
我们提供了2009年至2016年间拍摄的WFC 3 HST木星观测的五个时期，并提取了每个时期的全球纬向风廓线。这些年来，木星的纬向风场在全球范围内是稳定的，但在某些纬度地区仍然存在显着的变化。我们发现，在风场中最大的不确定性是由于涡流或热点，并显示残差图，确定最强的涡流。纬向风廓线中最强的年际变化是24°N急流峰。在北方温带地区观测到大量的烟羽爆发，并与纬向速度和亮度的降低有关。我们发现，24°N急流的峰值速度和亮度在2012年下降，并在2016年底再次下降，在这些年爆发之后。我们2016年2月的纬向风廓线是朱诺号首次科学观测之前的最后一次高空间分辨率测量。2016年的最终数据是在2016年12月11日朱诺的近木星3号通过时拍摄的，显示了2016年10月24°N羽流爆发后的纬向风廓线。
We present five epochs of WFC3 HST Jupiter observations taken between 2009–2016 and extract global zonal wind profiles for each epoch. Jupiter’s zonal wind field is globally stable throughout these years, but significant variations in certain latitude regions persist. We find that the largest uncertainties in the wind field are due to vortices or hot-spots, and show residual maps which identify the strongest vortex flows. The strongest year-to-year variation in the zonal wind profiles is the 24°N jet peak. Numerous plume outbreaks have been observed in the Northern Temperate Belt and are associated with decreases in the zonal velocity and brightness. We show that the 24°N jet peak velocity and brightness decreased in 2012 and again in late 2016, following outbreaks during these years. Our February 2016 zonal wind profile was the last highly spatially resolved measurement prior toJuno's first science observations. The final 2016 data were taken in conjunction withJuno’s perijove 3 pass on 11 December 2016, and show the zonal wind profile following the plume outbreak at 24°N in October 2016.