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Plasma Environment of Titan: a 3D Hybrid Simulation Study

Simon, S. und Bößwetter, A. und Bagdonat, T. und Motschmann, U. und Glassmeier, K.H. (2006) Plasma Environment of Titan: a 3D Hybrid Simulation Study. Annales Geophysicae, 24 (3), Seiten 1113-1135. EGU. ISSN 0992-7689.

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Kurzfassung

Titan possesses a dense atmosphere, consisting mainly of molecular nitrogen. Titan's orbit is located within the Saturnian magnetosphere most of the time, where the corotating plasma flow is super-Alfvénic, yet subsonic and submagnetosonic. Since Titan does not possess a significant intrinsic magnetic field, the incident plasma interacts directly with the atmosphere and ionosphere. Due to the characteristic length scales of the interaction region being comparable to the ion gyroradii in the vicinity of Titan, magnetohydrodynamic models can only offer a rough description of Titan's interaction with the corotating magnetospheric plasma flow. For this reason, Titan's plasma environment has been studied by using a 3-D hybrid simulation code, treating the electrons as a massless, charge-neutralizing fluid, whereas a completely kinetic approach is used to cover ion dynamics. The calculations are performed on a curvilinear simulation grid which is adapted to the spherical geometry of the obstacle. In the model, Titan's dayside ionosphere is mainly generated by solar UV radiation; hence, the local ion production rate depends on the solar zenith angle. Because the Titan interaction features the possibility of having the densest ionosphere located on a face not aligned with the ram flow of the magnetospheric plasma, a variety of different scenarios can be studied. The simulations show the formation of a strong magnetic draping pattern and an extended pick-up region, being highly asymmetric with respect to the direction of the convective electric field. In general, the mechanism giving rise to these structures exhibits similarities to the interaction of the ionospheres of Mars and Venus with the supersonic solar wind. The simulation results are in agreement with data from recent Cassini flybys.

Dokumentart:Zeitschriftenbeitrag
Titel:Plasma Environment of Titan: a 3D Hybrid Simulation Study
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Simon, S.TU Braunschweig
Bößwetter, A.TU Braunschweig
Bagdonat, T.TU Braunschweig
Motschmann, U.NICHT SPEZIFIZIERT
Glassmeier, K.H.TU Braunschweig
Datum:2006
Erschienen in:Annales Geophysicae
Referierte Publikation:Ja
In ISI Web of Science:Ja
Band:24
Seitenbereich:Seiten 1113-1135
Verlag:EGU
ISSN:0992-7689
Status:veröffentlicht
Stichwörter:Titan, hybrid simulation, plasma
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EW - Erforschung des Weltraums
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Asteroiden und Kometen (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Asteroiden und Kometen
Hinterlegt von: Dr.rer.nat. Ekkehard Kührt
Hinterlegt am:26 Jun 2006
Letzte Änderung:27 Apr 2009 12:56

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