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dc.contributor.author
Simon, Sven
dc.contributor.author
van Treeck, Shari C.
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Wennmacher, Alexandre
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Saur, Joachim
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Neubauer, Fritz M.
dc.contributor.author
Bertucci, Cesar
dc.contributor.author
Dougherty, Michele K.
dc.date.available
2015-06-16T20:50:06Z
dc.date.issued
2013-04
dc.identifier.citation
Simon, Sven; van Treeck, Shari C.; Wennmacher, Alexandre; Saur, Joachim; Neubauer, Fritz M.; et al.; Structure of Titan ’ s induced magnetosphere under varying background magnetic fi eld conditions: Survey of Cassini magnetometer data from fl ybys TA – T85; Amer Geophysical Union; Journal Of Geophysical Research; 118; 4-2013; 1-21
dc.identifier.issn
0148-0227
dc.identifier.uri
http://hdl.handle.net/11336/784
dc.description.abstract
Cassini magnetic field observations between 2004 and 2012 suggest the ambient field conditions near Titan’s orbit to differ significantly from the frequently applied pre-Cassini picture (background magnetic field homogeneous and perpendicular to Titan’s orbital plane, stationary upstream conditions). In this study, we analyze the impact of these varying background field conditions on the structure of Titan’s induced magnetosphere by conducting a systematic survey of Cassini magnetic field observations in the interaction region during flybys TA–T85 (July 2004–July 2012). We introduce a set of criteria that allow to identify deviations in the structure of Titan’s induced magnetosphere—as seen by the Cassini magnetometer (MAG)—from the picture of steady-state field line draping. These disruptions are classified as “weak”, “moderate”, or “strong”. After applying this classification scheme to all available Titan encounters, we survey the data for a possible correlation between the disruptions of the draping pattern and the ambient magnetospheric field conditions, as characterized by Simon et al. [2010a]. Our major findings are: (1) When Cassini is embedded in the northern or southern lobe of Saturn’s magnetodisk within a ` 3 h interval around closest approach, Titan’s induced magnetosphere shows little or no deviations at all from the steady-state draping picture. (2) Even when Titan is embedded in perturbed current sheet fields during an encounter, the notion of draping the average background field around the moon’s ionosphere is still applicable to explain MAG observations from numerous Titan flybys. (3) Only when Titan is exposed to intense north- south oscillations of Saturn’s current sheet at the time of an encounter, the signatures of the moon’s induced magnetosphere may be completely obscured by the ambient field perturbations. (4) So far, T70 is the only flyby that fully meets the idealized pre-Cassini picture of the Titan interaction (steady background field perpendicular to Titan’s orbital plane, steady upstream flow, unperturbed induced magnetosphere).
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Amer Geophysical Union
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Titan
dc.subject
Induced Magnetosphere
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Moon-Magnetosphere Interactions
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Cassini Magnetometer
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Magnetodisk
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Astronomía
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Structure of Titan ’ s induced magnetosphere under varying background magnetic fi eld conditions: Survey of Cassini magnetometer data from fl ybys TA – T85
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2016-03-30 10:35:44.97925-03
dc.journal.volume
118
dc.journal.pagination
1-21
dc.journal.pais
Estados Unidos
dc.description.fil
Fil: Simon, Sven. University of Cologne. Institute of Geophysics and Meteorology; Alemania
dc.description.fil
Fil: van Treeck, Shari C.. University of Cologne. Institute of Geophysics and Meteorology; Alemania
dc.description.fil
Fil: Wennmacher, Alexandre. University of Cologne. Institute of Geophysics and Meteorology; Alemania
dc.description.fil
Fil: Saur, Joachim. University of Cologne. Institute of Geophysics and Meteorology; Alemania
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Fil: Neubauer, Fritz M.. University of Cologne. Institute of Geophysics and Meteorology; Alemania
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Fil: Bertucci, Cesar. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio(i); Argentina
dc.description.fil
Fil: Dougherty, Michele K.. Imperial College Of Science And Technology. Space and Atmospheric Physics Group; Reino Unido
dc.journal.title
Journal Of Geophysical Research
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1002/jgra.50096/abstract
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1002/jgra.50096
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