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dc.contributor.author
Rosenqvist, L.
dc.contributor.author
Wahlund, J. E.
dc.contributor.author
Ågren, K.
dc.contributor.author
Modolo, R.
dc.contributor.author
Opgenoorth, H. J.
dc.contributor.author
Strobel, D.
dc.contributor.author
Müller Wodarg, I.
dc.contributor.author
Garnier, P.
dc.contributor.author
Bertucci, Cesar
dc.date.available
2017-07-17T15:53:54Z
dc.date.issued
2009-12
dc.identifier.citation
Rosenqvist, L.; Wahlund, J. E.; Ågren, K.; Modolo, R.; Opgenoorth, H. J.; et al.; Titan ionospheric conductivities from Cassini measurements; Elsevier; Planetary and Space Science; 57; 14-15; 12-2009; 1828-1833
dc.identifier.issn
0032-0633
dc.identifier.uri
http://hdl.handle.net/11336/20679
dc.description.abstract
(approximately the location of the exobase) to approximately 1000 km where electrical currents perpendicular to the magnetic field may become important. In this region the ionosphere is highly conductive with peak Pedersen conductivities of 0.002–0.05 S/m and peak Hall conductivities of 0.01–0.3 S/m depending on Solar illumination and magnetospheric conditions. Ionospheric conductivities are found to be typically higher on the sunlit side of Titan. However, Hall and Pedersen conductivities depend strongly on the magnetic field magnitude which is highly variable, both in altitude and with respect to the draping configuration of Saturn's magnetic field around Titan. Furthermore, a consistent double peak nature is found in the altitude profile of the Pedersen conductivity. A high altitude peak is found to be located between 1300 and 1400 km. A second and typically more conductive region is observed below 1000 km, where the magnetic field strength drops sharply while the electron density still remains high. This nature of the Pedersen conductivity profile may give rise to complicated ionospheric–atmospheric dynamics and may be expected also at other unmagnetized objects with a substantial atmosphere, such as e.g. Mars and Venus. Estimates of the total Pedersen conductance are found to range between 1300 and 22,000 S. The Pedersen conductance is always higher than the local Alfvén conductance but the difference varies by two orders of magnitude (from a factor 4 to 100). Thus, the conditions for reflection or absorption of Alfvén waves in Titans ionosphere are highly variable and depends strongly on the magnetic field strength.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject
Titan
dc.subject
Ionosphere
dc.subject
Cassini
dc.subject
Conductivity
dc.subject.classification
Astronomía
dc.subject.classification
Ciencias Físicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Titan ionospheric conductivities from Cassini measurements
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-07-17T13:33:42Z
dc.journal.volume
57
dc.journal.number
14-15
dc.journal.pagination
1828-1833
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
Fil: Rosenqvist, L.. Swedish Institute of Space Physics; Suecia
dc.description.fil
Fil: Wahlund, J. E.. Swedish Institute of Space Physics; Suecia
dc.description.fil
Fil: Ågren, K.. Swedish Institute of Space Physics; Suecia
dc.description.fil
Fil: Modolo, R.. Swedish Institute of Space Physics; Suecia
dc.description.fil
Fil: Opgenoorth, H. J.. Solar System Mission Division; Países Bajos
dc.description.fil
Fil: Strobel, D.. University Johns Hopkins; Estados Unidos
dc.description.fil
Fil: Müller Wodarg, I.. Imperial College London; Reino Unido
dc.description.fil
Fil: Garnier, P.. Swedish Institute of Space Physics; Suecia
dc.description.fil
Fil: Bertucci, Cesar. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
dc.journal.title
Planetary and Space Science
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.pss.2009.01.007
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0032063309000233
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