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Conductivities of Titan's Dusty Ionosphere
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.ORCID iD: 0000-0001-9621-211x
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.ORCID iD: 0000-0002-2107-5859
Southwest Res Inst, San Antonio, TX USA..
Imperial Coll London, London, England..
2022 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 127, no 2, article id e2021JA029910Article in journal (Refereed) Published
Abstract [en]

Titan's ionosphere hosts a globally distributed non-trivial dusty ion-ion plasma, providing an environment for studies of dusty ionospheres that is in many aspects unique in our solar system. Thanks to the Cassini mission, Titan's ionosphere also features one of the largest dusty plasma data sets from 126 flybys of the moon over 13 years, from 2004 to 2017. Recent studies have shown that negatively charged dust dramatically alters the electric properties of plasmas, in particular planetary ionospheres. Utilizing the full plasma content of the moon's ionosphere (electrons, positive ions, and negative ions/dust grains), we derive the electric conductivities and define the conductive dynamo region. Our results show that using the full plasma content increases the Pedersen conductivities at similar to 1,100-1,200 km altitude by up to 35% compared to the estimates using only electron densities. The Hall conductivities are in general not affected but several cases indicate a reverse Hall effect at similar to 900 km altitude (closest approach) and below. The dayside conductivities are shown to be factor similar to 7-9 larger than on the nightside, owing to higher dayside plasma densities.

Place, publisher, year, edition, pages
American Geophysical Union (AGU) American Geophysical Union (AGU), 2022. Vol. 127, no 2, article id e2021JA029910
Keywords [en]
dusty plasma, ionosphere, conductivity, Titan, Cassini
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-472231DOI: 10.1029/2021JA029910ISI: 000765721800031OAI: oai:DiVA.org:uu-472231DiVA, id: diva2:1651176
Available from: 2022-04-11 Created: 2022-04-11 Last updated: 2024-01-15Bibliographically approved

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Shebanits, OlegWahlund, Jan-Erik

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