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Plasma Transport in...
Plasma Transport in Saturn's Low-Latitude Ionosphere : Cassini Data
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- Cravens, T. E. (author)
- Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA
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- Morooka, Michiko (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Renzaglia, A. (author)
- Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA
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- Moore, L. (author)
- Boston Univ, Ctr Space Phys, Boston, MA 02215 USA
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- Waite, J. H., Jr. (author)
- Southwest Res Inst, Space Sci & Engn Div, San Antonio, TX USA
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- Perryman, R. (author)
- Southwest Res Inst, Space Sci & Engn Div, San Antonio, TX USA
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- Perry, M. (author)
- Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA
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- Wahlund, Jan-Erik (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Persoon, A. (author)
- Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
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- Hadid, Lina Z (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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(creator_code:org_t)
- 2019
- 2019
- English.
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In: Journal of Geophysical Research - Space Physics. - 2169-9380 .- 2169-9402. ; 124:6, s. 4881-4888
- 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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- In 2017 the Cassini Orbiter made the first in situ measurements of the upper atmosphere and ionosphere of Saturn. The Ion and Neutral Mass Spectrometer in its ion mode measured densities of light ion species (H+, H-2(+), H-3(+), and He+), and the Radio and Plasma Wave Science instrument measured electron densities. During proximal orbit 287 (denoted P287), Cassini reached down to an altitude of about 3,000 km above the 1 bar atmospheric pressure level. The topside ionosphere plasma densities measured for P287 were consistent with ionospheric measurements during other proximal orbits. Spacecraft potentials were measured by the Radio and Plasma Wave Science Langmuir probe and are typically about negative 0.3 V. Also, for this one orbit, Ion and Neutral Mass Spectrometer was operated in an instrument mode allowing the energies of incident H+ ions to be measured. H+ is the major ion species in the topside ionosphere. Ion flow speeds relative to Saturn's atmosphere were determined. In the southern hemisphere, including near closest approach, the measured ion speeds were close to zero relative to Saturn's corotating atmosphere, but for northern latitudes, southward ion flow of about 3 km/s was observed. One possible interpretation is that the ring shadowing of the southern hemisphere sets up an interhemispheric plasma pressure gradient driving this flow.
Subject headings
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Cravens, T. E.
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Morooka, Michiko
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Renzaglia, A.
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Moore, L.
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Waite, J. H., Jr ...
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Perryman, R.
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Perry, M.
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Wahlund, Jan-Eri ...
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Persoon, A.
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Hadid, Lina Z
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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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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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Journal of Geoph ...
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Uppsala University