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Re-Analysis of the Cassini RPWS/LP Data in Titan's Ionosphere : 1. Detection of Several Electron Populations
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- Chatain, A. (author)
- Univ Paris Saclay, UVSQ, CNRS, LATMOS, Guyancourt, France.;Sorbonne Univ, CNRS, Inst Polytech Paris, LPP,Ecole Polytech, Palaiseau, France.
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- Wahlund, Jan-Erik (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Shebanits, Oleg (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Imperial Coll London, South Kensington, England.
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- Univ Paris Saclay, UVSQ, CNRS, LATMOS, Guyancourt, France;Sorbonne Univ, CNRS, Inst Polytech Paris, LPP,Ecole Polytech, Palaiseau, France. Institutet för rymdfysik, Uppsalaavdelningen (creator_code:org_t)
- American Geophysical Union (AGU), 2021
- 2021
- English.
- In: Journal of Geophysical Research - Space Physics. - : American Geophysical Union (AGU). - 2169-9380 .- 2169-9402. ; 126:8
- Journal article (peer-reviewed)
Abstract
Subject headings
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- Current models of Titan's ionosphere have difficulties in explaining the observed electron density and/or temperature. In order to get new insights, we re-analyzed the data taken in the ionosphere of Titan by the Cassini Langmuir probe (LP), part of the Radio and Plasma Wave Science (RPWS) instrument. This is the first of two papers that present the new analysis method (current paper) and statistics on the whole data set. We suggest that between two and four electron populations are necessary to fit the data. Each population is defined by a potential, an electron density and an electron temperature and is easily visualized by a distinct peak in the second derivative of the electron current, which is physically related to the electron energy distribution function (Druyvesteyn method). The detected populations vary with solar illumination and altitude. We suggest that the four electron populations are due to photo-ionization, magnetospheric particles, dusty plasma and electron emission from the probe boom, respectively.
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)
Keyword
- dusty plasma
- electron populations
- electron temperature
- Langmuir probe
- RPWS
- Titan ionosphere
Publication and Content Type
- ref (subject category)
- art (subject category)
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