Titan's Magnetic Field Signature During the First Cassini Encounter

Author:

Backes Heiko12345,Neubauer Fritz M.12345,Dougherty Michele K.12345,Achilleos Nicholas12345,André Nicolas12345,Arridge Christopher S.12345,Bertucci Cesar12345,Jones Geraint H.12345,Khurana Krishan K.12345,Russell Christopher T.12345,Wennmacher Alexandre12345

Affiliation:

1. Institut für Geophysik und Meteorologie, Universität zu Köln, Albertus Magnus Platz, 50678 Cologne, Germany.

2. Space and Atmospheric Physics, Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2AZ, UK.

3. Centre d'Etude Spatiale des Rayonnements, Université Paul Sabatier, Toulouse, France.

4. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109–8099, USA.

5. Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095–1567, USA.

Abstract

The magnetic field signature obtained by Cassini during its first close encounter with Titan on 26 October 2004 is presented and explained in terms of an advanced model. Titan was inside the saturnian magnetosphere. A magnetic field minimum before closest approach marked Cassini's entry into the magnetic ionopause layer. Cassini then left the northern and entered the southern magnetic tail lobe. The magnetic field before and after the encounter was approximately constant for ∼20 Titan radii, but the field orientation changed exactly at the location of Titan's orbit. No evidence of an internal magnetic field at Titan was detected.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference28 articles.

1. A. W. Schardt et al., Saturn, T. Gehrels, M. S. Matthews, Eds. (Univ. of Ariz. Press, Tucson, AZ, 1984), pp. 417-459.

2. This velocity was measured by Voyager 1 ( 3 ). Ideal corotation would imply a velocity of 200 km/s in Titan's restframe.

3. F. M. Neubauer, D. A. Gurnett, J. D. Scudder, R. E. Hartle, Saturn, T. Gehrels, M. S. Matthews, Eds. (Univ. of Ariz. Press, Tucson, AZ, 1984), pp. 760-787.

4. Plasma-β: ratio of thermal and magnetic pressure.

5. The Cassini Magnetic Field Investigation

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