期刊
ANNALES GEOPHYSICAE
卷 33, 期 10, 页码 1203-1209出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/angeo-33-1203-2015
关键词
Atmospheric composition and structure (airglow and aurora); magnetospheric physics (auroral phenomena; current systems)
资金
- Fund for Scientific Research (F.R.S-FNRS)
- PRODEX program
- JSPS (Japan Society for the Promotion of Science) Postdoctoral Fellowships for Research Abroad
- NASA/ESA Hubble Space Telescope [10140, 10507, 10862]
- Grants-in-Aid for Scientific Research [15K17769] Funding Source: KAKEN
The main auroral emission at Jupiter generally appears as a quasi-closed curtain centered around the magnetic pole. This auroral feature, which accounts for approximately half of the total power emitted by the aurorae in the ultraviolet range, is related to corotation enforcement currents in the middle magnetosphere. Early models for these currents assumed axisymmetry, but significant local time variability is obvious on any image of the Jovian aurorae. Here we use far-UV images from the Hubble Space Telescope to further characterize these variations on a statistical basis. We show that the dusk side sector is similar to 3 times brighter than the dawn side in the southern hemisphere and similar to 1 : 1 brighter in the northern hemisphere, where the magnetic anomaly complicates the interpretation of the measurements. We suggest that such an asymmetry between the dawn and the dusk sectors could be the result of a partial ring current in the nightside magnetosphere.
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