Infrared Characterization of Jupiter's Equatorial Disturbance Cycle
Infrared Characterization of Jupiter's Equatorial Disturbance Cycle
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DOI：
10.1029/2018gl080382
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发表时间：
2018-10-28
影响因子：
5.2
通讯作者：
Blake, James S. D.
中科院分区：
文献类型：
--
作者：
Antunano, Arrate;Fletcher, Leigh N.;Blake, James S. D.
我们使用1984年至2017年期间使用几种仪器和天文台捕获的红外数据集，报告了五种罕见的赤道扰动，这些扰动完全改变了木星赤道区（EZ）的外观：对流层云的清除揭示了一个新的5 μ m明亮带，环绕着赤道的行星，伴随着5 μ m明亮的大灯丝。在1973年、1979年和1992年的地面图像中观察到了三次事件。我们报告和表征的第一次整个演化的两个新的事件，这种不寻常的EZ状态，提出了他们的最大5亩米的亮度在1999年12月和2007年2月，正好与赤道以南的棕色着色和大的蓝色灯丝和白色羽在北方EZ在可见光波长。我们描述了它们典型的红外亮寿命为12-18个月，可能的周期为6-8或13-14年。我们预测2019- 2021年可能会发生全面的赤道扰动。简单的语言总结木星的带状结构，白色带（云覆盖区域）和棕色带（无云区域），表现出戏剧性的行星尺度变化。在本文中，我们报告了五个罕见的事件，在木星的赤道带，完全改变了这个带的外观在云形成区（1-4巴），留下一个明亮的带在赤道，伴随着狭窄和明亮的细丝（花彩）在北方赤道带。我们使用地面5 μ m数据，揭示了1984年6月至2017年8月（近三个木星年）期间捕获的1至4 bar区域（氨云下方）的热发射，首次报告和描述了1999-2000年和2006-2007年发生的木星赤道区的两个新扰动。我们发现，在这些扰动期间，赤道区云形态的变化首先发生在云顶（类似于700毫巴），几个月前，在1-4巴的云形成区观察到。我们还发现，这些扰动被限制在云层（类似于150毫巴至4巴），持续12-18个月。在分析了五个记录的赤道区扰动后，我们得出结论，这些事件是周期性的/随机的，典型的间隔为6-8或13-14年。我们预测在2019-2021年，在朱诺号的探索时期，会有一个新的扰动。
We use an infrared data set captured between 1984 and 2017 using several instruments and observatories to report five rare equatorial disturbances that completely altered the appearance of Jupiter's equatorial zone (EZ): the clearance of tropospheric clouds revealed a new 5- mu m-bright band encircling the planet at the equator, accompanied by large 5-mu m-bright filaments. Three events were observed in ground-based images in 1973, 1979, and 1992. We report and characterize for the first time the entire evolution of two new episodes of this unusual EZ state that presented their maximum 5-mu m-brightness in December 1999 and February 2007, coinciding with a brown coloration south of the equator and with large bluish filaments and white plumes in the northern EZ at visible wavelengths. We characterize their typical infrared-bright lifetimes of 12-18 months, with possible periodicities of 6-8 or 13-14 years. We predict that a full-scale equatorial disturbance could occur in 2019-2021.Plain Language Summary Jupiter's banded structure, white zones (cloud-covered regions) and brown belts (cloud-free regions), exhibits dramatic planetary-scale changes. In this paper, we report five rare events at Jupiter's equatorial zone that changed the appearance of this zone completely at the cloud forming region (1-4 bar), leaving a bright band at the equator, accompanied by narrow and bright filaments (festoons) at the northern equatorial zone. We use ground-based 5-mu m data, which reveal the thermal emission from 1 to 4 bar region (bellow the ammonia cloud), captured between June 1984 and August 2017 (almost three Jovian years) to report and characterize for the first time two new disturbances at Jupiter's equatorial zone that took place in 1999-2000 and 2006-2007. We found that changes in the cloud morphology at the equatorial zone during these disturbances occurred first at the cloud tops (similar to 700 mbar), months before they were observed at the cloud forming region at 1-4 bar. We also found that these disturbances are confined at the cloud deck (similar to 150 mbar to 4 bar), lasting 12-18 months. After analyzing five documented equatorial zone disturbances, we conclude that these events are periodic/stochastic with typical intervals of 6-8 or 13-14 years. We predict a new disturbance in 2019-2021, during Juno's exploration epoch.