globalchange  > 气候减缓与适应
DOI: 10.1029/2018JA025328
Scopus记录号: 2-s2.0-85047471354
论文题名:
Spatial Distribution of Io's Neutral Oxygen Cloud Observed by Hisaki
作者: Koga R.; Tsuchiya F.; Kagitani M.; Sakanoi T.; Yoneda M.; Yoshioka K.; Yoshikawa I.; Kimura T.; Murakami G.; Yamazaki A.; Smith H.T.; Bagenal F.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:5
起始页码: 3764
结束页码: 3776
语种: 英语
英文关键词: Hisaki ; Io ; neutral cloud ; oxygen
英文摘要: We report on the spatial distribution of a neutral oxygen cloud surrounding Jupiter's moon Io and along Io's orbit observed by the Hisaki satellite. Atomic oxygen and sulfur in Io's atmosphere escape from the exosphere mainly through atmospheric sputtering. Some of the neutral atoms escape from Io's gravitational sphere and form neutral clouds around Jupiter. The extreme ultraviolet spectrograph called EXCEED (Extreme Ultraviolet Spectroscope for Exospheric Dynamics) installed on the Japan Aerospace Exploration Agency's Hisaki satellite observed the Io plasma torus continuously in 2014–2015, and we derived the spatial distribution of atomic oxygen emissions at 130.4 nm. The results show that Io's oxygen cloud is composed of two regions, namely, a dense region near Io and a diffuse region with a longitudinally homogeneous distribution along Io's orbit. The dense region mainly extends on the leading side of Io and inside of Io's orbit. The emissions spread out to 7.6 Jupiter radii (RJ). Based on Hisaki observations, we estimated the radial distribution of the atomic oxygen number density and oxygen ion source rate. The peak atomic oxygen number density is 80 cm−3, which is spread 1.2 RJ in the north-south direction. We found more oxygen atoms inside Io's orbit than a previous study. We estimated the total oxygen ion source rate to be 410 kg/s, which is consistent with the value derived from a previous study that used a physical chemistry model based on Hisaki observations of ultraviolet emission ions in the Io plasma torus. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114012
Appears in Collections:气候减缓与适应

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作者单位: Planetary Plasma and Atmospheric Research Center, Tohoku University, Sendai, Japan; Technical Research Center, Tadano Ltd., Takamatsu, Japan; Department of Complexity Science and Engineering, University of Tokyo, Kashiwa, Japan; Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai, Japan; Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan; Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, United States; Laboratory of Atmospheric and Space Physics, University of Colorado, Boulder, CO, United States

Recommended Citation:
Koga R.,Tsuchiya F.,Kagitani M.,et al. Spatial Distribution of Io's Neutral Oxygen Cloud Observed by Hisaki[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(5)
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