Reference : Auroral counterpart of magnetic field dipolarizations in Saturn's tail
Scientific congresses and symposiums : Paper published in a book
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/128453
Auroral counterpart of magnetic field dipolarizations in Saturn's tail
English
Jackman, C. M. mailto [Physics and Astronomy, University College London, London, United Kingdom;]
Achilleos, N. mailto [Physics and Astronomy, University College London, London, United Kingdom;]
Bunce, E. J. mailto [University of Leicester, Leicester, United Kingdom;]
Cowley, S. W. mailto [University of Leicester, Leicester, United Kingdom;]
Radioti, Aikaterini mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) >]
Grodent, Denis mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Physique des atmosphères et des environnements planétaires >]
Badman, S. V. mailto [Institute of Space and Astronautical Science, JAXA, Kanagawa, Japan;]
Dougherty, M. K. mailto [Imperial College London, London, United Kingdom;]
Melin, H. mailto [University of Leicester, Leicester, United Kingdom;]
Stallard, T. mailto [University of Leicester, Leicester, United Kingdom;]
Gustin, Jacques mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Physique des atmosphères et des environnements planétaires >]
Pryor, W. R. mailto [Science Department, Central Arizona College, Coolidge, AZ, USA;]
Baines, K. H. mailto [> >]
Cassini MAG-VIMS Team [JPL, Pasadena, CA, USA)]
1-Dec-2011
American Geophysical Union, Fall Meeting 2011, abstract #SM14A-07
07
No
American Geophysical Union, Fall Meeting 2011
December 2011
[en] [2704] MAGNETOSPHERIC PHYSICS / Auroral phenomena ; [2723] MAGNETOSPHERIC PHYSICS / Magnetic reconnection ; [2756] MAGNETOSPHERIC PHYSICS / Planetary magnetospheres ; [6275] PLANETARY SCIENCES: SOLAR SYSTEM OBJECTS / Saturn
[en] Following magnetic reconnection in a planetary magnetotail, newly closed field lines can be rapidly accelerated back towards the planet, becoming "dipolarized" in the process. At Saturn, dipolarizations can be initially identified from the magnetometer data by looking for a southward turning of the magnetic field, indicating the transition from a radially stretched configuration to a more dipolar field topology. The highly stretched geometry of the kronian magnetotail lobes gives rise to a tail current which flows eastward (dusk to dawn) in the near equatorial plane across the centre of the tail. During reconnection and associated dipolarization of the field, the inner edge of this tail current can be diverted through the ionosphere, in a situation analogous to the substorm current wedge picture at Earth [McPherron et al. 1973]. We present a picture of the current circuit arising from this tail reconfiguration, and outline the equations which govern the field-current relationship. We show a number of examples of dipolarizations as identified in the Cassini magnetometer data and use this formalism to calculate limits for the ionospheric current density that would arise for these examples. In addition to the magnetometer data, we also present data from the Cassini VIMS and UVIS instruments which have observed small 'spots' of auroral emission lying near the main oval - features thought to be associated with dipolarizations in the tail. We compare the auroral intensities as predicted from our calculation with the observed spot sizes and intensities.
http://hdl.handle.net/2268/128453
http://adsabs.harvard.edu/abs/2011AGUFMSM14A..07J

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