The ionosphere of Jupiter in the Juno era

朱诺时代木星的电离层

• 批准号: 2780809
• 金额: --
• 依托单位: University of Leicester
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2780809
• 关键词: ionosphere; Jupiter; Juno; era

"The NASA Juno spacecraft has been in orbit at Jupiter since 2016 in 53 day long polar orbit. This provides completely new and dramatic views of the planet, very different from the ones we get from here at Earth. The near-infrared instrument on the orbiter (JIRAM - the Jovian Infrared Auroral Mapper) provides stunning data of ionosphere, the charged particle component of the upper atmosphere. The ionosphere is a very important region since it can 'feel' the magnetic field, and is there for a region where momentum and energy is exchanged between the atmosphere and the magnetosphere. The stunningly bright and variable auroral displays at Jupiter provides a mechanism to heat the upper atmosphere at the poles, but how is this energy re-distributed towards lower latitudes? Our understanding of the ionosphere away from the auroral region is very limited, and Juno JIRAM provides a window through which we can begin to understand this region. A dominant ion in the ionosphere is the molecular ion H3+, and by fitting its observed spectrum using the model developed at Leicester we can determine the temperature and ion density of any particular point on the planet, with each successive orbit providing a view of how this changes over time. This project will investigate how energy is re-distributed in the upper atmosphere of Jupiter, and how important the heating by gravity waves, generated by the turbulent lower atmosphere, are on a global scale. Will also have the opportunity to lead Juno support observations using the NASA Infrared Telescope Facility in Hawaii, from which we can determine the amount of forcing that the magnetosphere exerts on the ionosphere and atmosphere, a highly complementary data product to the high spatial resolution data taken by Juno JIRAM.

“美国宇航局朱诺号航天器自 2016 年以来一直在木星轨道上运行，为期 53 天的极地轨道。这提供了木星的全新且引人注目的视图，与我们在地球上获得的视图非常不同。轨道飞行器上的近红外仪器（JIRAM - 木星红外极光绘图仪）提供了电离层的惊人数据，电离层是高层大气的带电粒子成分。电离层是 这是一个非常重要的区域，因为它可以“感觉到”磁场，并且是大气层和磁层之间动量和能量交换的区域。木星上令人惊叹的明亮和多变的极光现象提供了一种加热两极高层大气的机制，但这种能量如何重新分配到低纬度地区呢？我们对远离极光区的电离层的了解非常有限，Juno JIRAM 提供了一个 通过它我们可以开始了解这个地区。电离层中的主要离子是分子离子 H3+，通过使用莱斯特开发的模型拟合其观测到的光谱，我们可以确定地球上任何特定点的温度和离子密度，每个连续的轨道都可以提供随时间变化的视图。该项目将研究能量如何在木星高层大气中重新分配，以及重力加热的重要性 由湍流的低层大气产生的波浪是全球范围内的。还将有机会使用夏威夷的 NASA 红外望远镜设施领导朱诺号支持观测，从中我们可以确定磁层对电离层和大气层施加的强迫量，这是与朱诺号 JIRAM 获取的高空间分辨率数据高度互补的数据产品。