Andre, N and Blanc, M and Maurice, S and Schippers, P and Pallier, E and Gombosi, TI and Hansen, KC and Young, DT and Crary, FJ and Bolton, S and Sittler, EC and Smith, HT and Johnson, RE and Baragiola, RA and Coates, AJ and Rymer, AM and Dougherty, MK and Achilleos, N and Arridge, CS and Krimigis, SM and Mitchell, DG and Krupp, N and Hamilton, DC and Dandouras, I and Gurnett, DA and Kurth, WS and Louarn, P and Srama, R and Kempf, S and Waite, HJ and Esposito, LW and Clarke, JT (2008) Identification of Saturn's magnetospheric regions and associated plasma processes: Synopsis of Cassini observations during orbit insertion. Reviews of Geophysics , 46 (4) , Article RG4008. 10.1029/2007RG000238.
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Saturn's magnetosphere is currently studied from the microphysical to the global scale by the Cassini-Huygens mission. During the first half of 2004, in the approach phase, remote sensing observations of Saturn's magnetosphere gave access to its auroral, radio, UV, energetic neutral atom, and dust emissions. Then, on 1 July 2004, Cassini Saturn orbit insertion provided us with the first in situ exploration of Saturn's magnetosphere since Voyager. To date, Saturn orbit insertion is the only Cassini orbit to have been described in common by all field and particle instruments. We use the comprehensive suite of magnetospheric and plasma science instruments to give a unified description of the large-scale structure of the magnetosphere during this particular orbit, identifying the different regions and their boundaries. These regions consist of the Saturnian ring system region 1, within 3 Saturn radii R-S)) and the cold plasma torus region 2, within 5-6 R-S) in the inner magnetosphere, a dynamic and extended plasma sheet region 3), and an outer high-latitude magnetosphere region 4, beyond 12-14 R-S). We compare these observations to those made at the time of the Voyager encounters. Then, we identify some of the dominant chemical characteristics and dynamical phenomena in each of these regions. The inner magnetosphere is characterized by the presence of the dominant plasma and neutral sources of the Saturnian system, giving birth to a very special magnetosphere dominated by water products. The extended plasma sheet, where the ring current resides, is a variable region with stretched magnetic field lines and contains a mixture of cold and hot plasma populations resulting from plasma transport processes. The outer high-latitude magnetosphere is characterized by a quiet magnetic field and an absence of plasma. Saturn orbit insertion observations enabled us to capture a snapshot of the large-scale structure of the Saturnian magnetosphere and of some of the main plasma processes operating in this complex environment. The analysis of the broad diversity of these interaction processes will be one of the main themes of magnetospheric and plasma science during the Cassini mission.
|Title:||Identification of Saturn's magnetospheric regions and associated plasma processes: Synopsis of Cassini observations during orbit insertion|
|Open access status:||An open access version is available from UCL Discovery|
|Additional information:||Copyright 2008 by the American Geophysical Union|
|Keywords:||Neutral mass-spectrometer, Kilometric radiation, Rotation period, Solar-wind, Io Torus, Thermal plasma, Enceladus, Radio, Field, Dynamics|
|UCL classification:||UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy|
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Space and Climate Physics
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