globalchange  > 气候减缓与适应
DOI: 10.1029/2018JA025296
Scopus记录号: 2-s2.0-85051030599
论文题名:
A Survey of Visible S+ Emission in Io's Plasma Torus During the Hisaki Epoch
作者: Schmidt C.; Schneider N.; Leblanc F.; Gray C.; Morgenthaler J.; Turner J.; Grava C.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:7
起始页码: 5610
结束页码: 5624
语种: 英语
英文摘要: To complement Hisaki's ultraviolet monitoring of the Io plasma torus, a ground-based campaign assembled a comprehensive data set at visible wavelengths with the ARC 3.5-m telescope at Apache Point Observatory. This work concentrates on the bright S+ emissions in these data. Recurrent traits in the intensity and location are discerned as a function of Jovian longitude (λIII). The longitudinal brightness structure differs from past data sets in the visible but is broadly consistent with that of Io's auroral footprint and concurrent Hisaki extreme ultraviolet measurements. Positions of the ribbon feature with λIII confirm that it exhibits a radial wobbling motion that is lesser than the centrifugal limit along a given L-shell. We also find that the radial separation between the cold torus and the ribbon is modulated as Jupiter rotates. The torus is displaced 0.13 RJ dawnward, on average, by an electric field with mean strength 3.8 mV/m, consistent with that inferred by analysis of Hisaki's dawn-dusk brightness asymmetry. The lesser visible brightness asymmetry is uncorrelated to this field strength, however. S+ emissions are enhanced downstream of Io, principally at Jovian dawn. Io interacts with the densest region at specific Jovian longitudes and local times; near λIII ~130° and dawn the ribbon is farthest from Jupiter but still passes radially interior to the satellite. The electron density sweeping past Io and/or its radial proximity to the passing ribbon may also influence brightness, but S+ emissions are not governed by a single predominant driver. ©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/113552
Appears in Collections:气候减缓与适应

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作者单位: Center for Space Physics, Boston University, Boston, MA, United States; LATMOS/IPSL, UPMC University Paris 06 Sorbonne Universités, UVSQ, CNRS, Paris, France; Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States; Department of Astronomy, New Mexico State University, Las Cruces, NM, United States; Planetary Science Institute, Tucson, AZ, United States; Department of Astronomy, University of Virginia, Charlottesville, VA, United States; Southwest Research Institute, San Antonio, TX, United States

Recommended Citation:
Schmidt C.,Schneider N.,Leblanc F.,et al. A Survey of Visible S+ Emission in Io's Plasma Torus During the Hisaki Epoch[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(7)
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