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Density Structures,...
Density Structures, Dynamics, and Seasonal and Solar Cycle Modulations of Saturn's Inner Plasma Disk
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- Holmberg, M. K. G. (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Institutionen för fysik och astronomi,Univ Toulouse, CNES, UPS, IRAP,CNRS, Toulouse, France.
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- Shebanits, Oleg (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Institutionen för fysik och astronomi
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- Wahlund, Jan-Erik (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Institutionen för fysik och astronomi
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- Morooka, Michiko (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Swedish Inst Space Phys, Uppsala, Sweden.
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- Vigren, Erik (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Andre, N. (author)
- Univ Toulouse, CNES, UPS, IRAP,CNRS, Toulouse, France.
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- Garnier, P. (author)
- Univ Toulouse, CNES, UPS, IRAP,CNRS, Toulouse, France.
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- Persoon, A. M. (author)
- Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA.
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- Genot, V. (author)
- Univ Toulouse, CNES, UPS, IRAP,CNRS, Toulouse, France.
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- Gilbert, L. K. (author)
- Univ Coll London, Mullard Space Sci Lab, Dorking, Surrey, England.
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(creator_code:org_t)
- AMER GEOPHYSICAL UNION, 2017
- 2017
- English.
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In: Journal of Geophysical Research - Space Physics. - : AMER GEOPHYSICAL UNION. - 2169-9380 .- 2169-9402. ; 122:12, s. 12258-12273
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- We present statistical results from the Cassini Radio and Plasma Wave Science (RPWS) Langmuir probe measurements recorded during the time interval from orbit 3 (1 February 2005) to 237 (29 June 2016). A new and improved data analysis method to obtain ion density from the Cassini LP measurements is used to study the asymmetries and modulations found in the inner plasma disk of Saturn, between 2.5 and 12 Saturn radii (1 RS = 60, 268 km). The structure of Saturn's plasma disk is mapped, and the plasma density peak, n(max), is shown to be located at similar to 4.6 RS and not at the main neutral source region at 3.95 RS. The shift in the location of n(max) is due to that the hot electron impact ionization rate peaks at similar to 4.6 RS. Cassini RPWS plasma disk measurements show a solar cycle modulation. However, estimates of the change in ion density due to varying EUV flux is not large enough to describe the detected dependency, which implies that an additional mechanism, still unknown, is also affecting the plasma density in the studied region. We also present a dayside/nightside ion density asymmetry, with nightside densities up to a factor of 2 larger than on the dayside. The largest density difference is found in the radial region 4 to 5 RS. The dynamic variation in ion density increases toward Saturn, indicating an internal origin of the large density variability in the plasma disk rather than being caused by an external source origin in the outer magnetosphere.
Subject headings
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Holmberg, M. K. ...
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Shebanits, Oleg
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Wahlund, Jan-Eri ...
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Morooka, Michiko
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Vigren, Erik
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Andre, N.
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show more...
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Garnier, P.
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Persoon, A. M.
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Genot, V.
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Gilbert, L. K.
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Fusion Plasma an ...
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Journal of Geoph ...
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Uppsala University