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Mapping the Brightn...
Mapping the Brightness of Ganymede's Ultraviolet Aurora Using Hubble Space Telescope Observations
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- Marzok, A. (författare)
- Univ Cologne, Inst Geophys & Meteorol, Cologne, Germany.
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- Schlegel, S. (författare)
- Univ Cologne, Inst Geophys & Meteorol, Cologne, Germany.
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- Saur, J. (författare)
- Univ Cologne, Inst Geophys & Meteorol, Cologne, Germany.
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- Roth, Lorenz (författare)
- KTH,Rymd- och plasmafysik
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- Grodent, D. (författare)
- Univ Liege, Lab Phys Atmospher & Planetaire, STAR Inst, Liege, Belgium.
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- Strobel, D. F. (författare)
- Johns Hopkins Univ, Dept Earth & Planetary Sci, Baltimore, MD 21218 USA.;Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA.
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- Retherford, K. D. (författare)
- Southwest Res Inst, San Antonio, TX USA.;Univ Texas San Antonio, San Antonio, TX USA.
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Univ Cologne, Inst Geophys & Meteorol, Cologne, Germany Rymd- och plasmafysik (creator_code:org_t)
- American Geophysical Union (AGU), 2022
- 2022
- Engelska.
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Ingår i: Journal of Geophysical Research - Planets. - : American Geophysical Union (AGU). - 2169-9097 .- 2169-9100. ; 127:6
- Relaterad länk:
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We analyze Hubble Space Telescope observations of Ganymede made with the Space Telescope Imaging Spectrograph between 1998 and 2017 to generate a brightness map of Ganymede's oxygen emission at 1,356 angstrom. Our Mercator projected map demonstrates that the brightness along Ganymede's northern and southern auroral ovals strongly varies with longitude. To quantify this variation around Ganymede, we investigate the brightness averaged over 36 degrees-wide longitude corridors centered around the sub-Jovian (0 degrees W), leading (90 degrees W), anti-Jovian (180 degrees W), and trailing (270 degrees W) central longitudes. In the northern hemisphere, the brightness of the auroral oval is 3.7 +/- 0.4 times lower in the sub-Jovian and anti-Jovian corridors compared to the trailing and leading corridors. The southern oval is overall brighter than the northern oval, and only 2.5 +/- 0.2 times fainter on the sub- and anti-Jovian corridors compared to the trailing and leading corridors. This demonstrates that Ganymede's auroral ovals are strongly structured in auroral crescents on the leading side (plasma downstream side) and on the trailing side (plasma upstream side). We also find that the brightness is not symmetric with respect to the 270 degrees meridian, but shifted by similar to 20 degrees towards the Jovian-facing hemisphere. Our map will be useful for subsequent studies to understand the processes that generate the aurora in Ganymede's non-rotationally driven, sub-Alfvenic magnetosphere.
Ämnesord
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
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- ref (ämneskategori)
- art (ämneskategori)
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