Search: WFRF:(Perryman M.) >
Saturn's Dusty Iono...
Saturn's Dusty Ionosphere
-
- Morooka, Michiko (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
-
- Wahlund, Jan-Erik (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
-
- Hadid, Lina Z. (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
-
show more...
-
- Eriksson, Anders I. (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
-
- Edberg, Niklas J. T. (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
-
- Vigren, Erik (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
-
- Andrews, David J. (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
-
- Persoon, A. M. (author)
- Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
-
- Kurth, W. S. (author)
- Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
-
- Gurnett, D. A. (author)
- Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
-
- Farrell, W. M. (author)
- NASA, Goddard Space Flight Ctr, Greenbelt, MD USA
-
- Waite, J. H. (author)
- Southwest Res Inst, San Antonio, TX USA
-
- Perryman, R. S. (author)
- Southwest Res Inst, San Antonio, TX USA
-
- Perry, M. (author)
- Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA
-
show less...
-
(creator_code:org_t)
- American Geophysical Union (AGU), 2019
- 2019
- English.
-
In: Journal of Geophysical Research - Space Physics. - : American Geophysical Union (AGU). - 2169-9380 .- 2169-9402. ; 124:3, s. 1679-1697
- Related links:
-
https://urn.kb.se/re...
-
show more...
-
https://doi.org/10.1...
-
show less...
Abstract
Subject headings
Close
- Measurements of electrons and ions in Saturn's ionosphere down to 1,500-km altitudes as well as the ring crossing region above the ionosphere obtained by the Langmuir probe onboard the Cassini spacecraft are presented. Five nearly identical deep ionosphere flybys during the Grand Finale orbits and the Final plunge orbit revealed a rapid increase in the plasma densities and discrepancies between the electrons and ions densities (N-e and N-i) near the closest approach. The small N-e/N-i ratio indicates the presence of a dusty plasma, a plasma which charge carrier is dominated by negatively charged heavy particles. Comparison of the Langmuir probe obtained density with the light ion density obtained by the Ion and Neutral Mass Spectrometer confirmed the presence of heavy ions. An unexpected positive floating potential of the probe was also observed when N-e/N-i << 1. This suggests that Saturn's ionosphere near the density peak is in a dusty plasma state consisting of negatively and positively charged heavy cluster ions. The electron temperature (T-e) characteristics in the ionosphere are also investigated and unexpectedly high electron temperature value, up to 5000 K, has been observed below 2,500-km altitude in a region where electron-neutral collisions should be prominent. A well-defined relationship between T-e and N-e/N-i ratio was found, implying that the electron heating at low altitudes is related to the dusty plasma state of the ionosphere.
Subject headings
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Keyword
- Saturn's ionosphere
- dusty plasma
- Langmuir probe
- plasma density
- electron temperature
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database
- By the author/editor
-
Morooka, Michiko
-
Wahlund, Jan-Eri ...
-
Hadid, Lina Z.
-
Eriksson, Anders ...
-
Edberg, Niklas J ...
-
Vigren, Erik
-
show more...
-
Andrews, David J ...
-
Persoon, A. M.
-
Kurth, W. S.
-
Gurnett, D. A.
-
Farrell, W. M.
-
Waite, J. H.
-
Perryman, R. S.
-
Perry, M.
-
show less...
- About the subject
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Physical Science ...
-
and Fusion Plasma an ...
- Articles in the publication
-
Journal of Geoph ...
- By the university
-
Uppsala University