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Abstract:

We analyze the variability of the ambient magnetospheric field along Titan's orbit at 20.3 Saturn radii. However, while our preceding study (Simon et al., 2010) focused on Cassini magnetometer observations from the 62 Titan flybys (TAT62) between October 2004 and October 2009, the present work discusses magnetic field data that were collected near Titan's orbit when the moon was far away. In analogy to the observations during TAT62, the magnetospheric fields detected during these 79 "virtual" Titan flybys are strongly affected by the presence of Saturn's bowl-shaped and highly dynamic magnetodisk current sheet. We therefore provide a systematic classification of the magnetic field observations as magnetodisk current sheet or lobe-type scenarios. Among the 141 (62 real79 virtual) crossings of Titan's orbit between July 2004 and December 2009, only 17 encounters (9 real8 virtual) took place within quiet, magnetodisk lobe-type fields. During another 50 encounters (21 real29 virtual), rapid transitions between current sheet and lobe fields were observed around the moon's orbital plane. Most of the encounters (54=22 real32 virtual) occurred when Titan's orbit was embedded in highly distorted current sheet fields, thereby invalidating the frequently applied idealized picture of Titan interacting with a homogeneous and stationary magnetospheric background field. The locations of real and virtual Titan flybys are correlated to each other. Each of the 62 real Titan flybys possesses at least one virtual counterpart that occurred shortly before or after the real encounter and at nearly the same orbital position. A systematic comparison between Cassini magnetometer observations from the real Titan flybys and their virtual companions suggests that there is no clear evidence of Titan exerting a significant level of control on the vertical oscillatory motion of the magnetodisk near its orbit. © 2010 Elsevier Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Dynamics of Saturn's magnetodisk near Titan's orbit: Comparison of Cassini magnetometer observations from real and virtual Titan flybys
Autor:Simon, S.; Wennmacher, A.; Neubauer, F.M.; Bertucci, C.L.; Kriegel, H.; Russell, C.T.; Dougherty, M.K.
Filiación:Institute of Geophysics and Meteorology, University of Cologne, Germany
Institute for Astronomy and Space Physics, CONICET/University of Buenos Aires, Ciudad Universitaria, Buenos Aires, Argentina
Space and Atmospheric Physics Group, Blackett Laboratory, Imperial College, London, United Kingdom
Institute for Theoretical Physics, TU Braunschweig, Germany
Institute of Geophysics and Planetary Physics, University of California, Los Angeles, United States
Palabras clave:Cassini flybys; Magnetodisk current sheet and lobes; Plasma interaction with unmagnetized bodies; Saturn's magnetosphere; Titan; Background field; Cassini; Cassini magnetometer; Current sheets; Distorted currents; Field observations; Magnetic field data; Magnetospheric field; Orbital planes; Oscillatory motion; Rapid transitions; Saturn's magnetosphere; Titan; Magnetic field effects; Magnetometers; Magnetosphere; Plasma interactions; Orbits
Año:2010
Volumen:58
Número:12
Página de inicio:1625
Página de fin:1635
DOI: http://dx.doi.org/10.1016/j.pss.2010.08.006
Título revista:Planetary and Space Science
Título revista abreviado:Planet. Space Sci.
ISSN:00320633
CODEN:PLSSA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00320633_v58_n12_p1625_Simon

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Citas:

---------- APA ----------
Simon, S., Wennmacher, A., Neubauer, F.M., Bertucci, C.L., Kriegel, H., Russell, C.T. & Dougherty, M.K. (2010) . Dynamics of Saturn's magnetodisk near Titan's orbit: Comparison of Cassini magnetometer observations from real and virtual Titan flybys. Planetary and Space Science, 58(12), 1625-1635.
http://dx.doi.org/10.1016/j.pss.2010.08.006
---------- CHICAGO ----------
Simon, S., Wennmacher, A., Neubauer, F.M., Bertucci, C.L., Kriegel, H., Russell, C.T., et al. "Dynamics of Saturn's magnetodisk near Titan's orbit: Comparison of Cassini magnetometer observations from real and virtual Titan flybys" . Planetary and Space Science 58, no. 12 (2010) : 1625-1635.
http://dx.doi.org/10.1016/j.pss.2010.08.006
---------- MLA ----------
Simon, S., Wennmacher, A., Neubauer, F.M., Bertucci, C.L., Kriegel, H., Russell, C.T., et al. "Dynamics of Saturn's magnetodisk near Titan's orbit: Comparison of Cassini magnetometer observations from real and virtual Titan flybys" . Planetary and Space Science, vol. 58, no. 12, 2010, pp. 1625-1635.
http://dx.doi.org/10.1016/j.pss.2010.08.006
---------- VANCOUVER ----------
Simon, S., Wennmacher, A., Neubauer, F.M., Bertucci, C.L., Kriegel, H., Russell, C.T., et al. Dynamics of Saturn's magnetodisk near Titan's orbit: Comparison of Cassini magnetometer observations from real and virtual Titan flybys. Planet. Space Sci. 2010;58(12):1625-1635.
http://dx.doi.org/10.1016/j.pss.2010.08.006