Comparing Electron Energetics and UV Brightness in Jupiter's Northern Polar Region During Juno Perijove 5
Comparing Electron Energetics and UV Brightness in Jupiter's Northern Polar Region During Juno Perijove 5
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比较朱诺近木星 5 号期间木星北极地区的电子能量和紫外线亮度
DOI：
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发表时间：
2019
影响因子：
5.2
通讯作者：
R. Wilson
中科院分区：
文献类型：
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作者：
R. Ebert;R. Ebert;T. Greathouse;G. Clark;F. Allegrini;F. Bagenal;S. Bolton;J. Connerney;G. Gladstone;M. Imai;V. Hue;W. Kurth;Steve Levin;P. Louarn;B. Mauk;D. McComas;C. Paranicas;J. Szalay;M. Thomsen;P. Valek;R. Wilson
我们比较电子和紫外线观测映射到相同的位置在木星的北方极地地区，极地的主要极光，在朱诺近木星5。当观测值同时映射到同一位置时，可以识别出紫外线亮度和电子能通量的同时峰值。在这些同时观测期间，向下的能量通量不足以产生观测到的紫外线亮度;向上的能量通量是。我们认为，主要的加速区域低于朱诺的高度，从更强烈的向上电子起源。在整个时间间隔内，紫外线亮度峰值约为240千瑞利（kR）;向下和向上的能量通量峰值分别为60和700 mW/m2。向下能量通量的增加与数十keV电子的贡献增加有关。这些观测结果提供了证据，具有广泛的能量分布的双向电子束可以产生数十至数百千瑞利极紫外辐射。
We compare electron and UV observations mapping to the same location in Jupiter's northern polar region, poleward of the main aurora, during Juno perijove 5. Simultaneous peaks in UV brightness and electron energy flux are identified when observations map to the same location at the same time. The downward energy flux during these simultaneous observations was not sufficient to generate the observed UV brightness; the upward energy flux was. We propose that the primary acceleration region is below Juno's altitude, from which the more intense upward electrons originate. For the complete interval, the UV brightness peaked at ~240 kilorayleigh (kR); the downward and upward energy fluxes peaked at 60 and 700 mW/m2, respectively. Increased downward energy fluxes are associated with increased contributions from tens of keV electrons. These observations provide evidence that bidirectional electron beams with broad energy distributions can produce tens to hundreds of kilorayleigh polar UV emissions.