Reference : Recurrent energization of plasma in the midnight-to-dawn quadrant of Saturn's magneto...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/75710
Recurrent energization of plasma in the midnight-to-dawn quadrant of Saturn's magnetosphere, and its relationship to auroral UV and radio emissions
English
Mitchell, D. G. [Johns Hopkins University Applied Physics Laboratory, MP3 E-132, 11100 Johns Hopkins Road, Laurel, MD 21042, USA]
Krimigis, S. M. [Johns Hopkins University Applied Physics Laboratory, MP3 E-132, 11100 Johns Hopkins Road, Laurel, MD 21042, USA]
Paranicas, C. [Johns Hopkins University Applied Physics Laboratory, MP3 E-132, 11100 Johns Hopkins Road, Laurel, MD 21042, USA]
Brandt, P. C. [Johns Hopkins University Applied Physics Laboratory, MP3 E-132, 11100 Johns Hopkins Road, Laurel, MD 21042, USA]
Carbary, J. F. [Johns Hopkins University Applied Physics Laboratory, MP3 E-132, 11100 Johns Hopkins Road, Laurel, MD 21042, USA]
Roelof, E. C. [Johns Hopkins University Applied Physics Laboratory, MP3 E-132, 11100 Johns Hopkins Road, Laurel, MD 21042, USA]
Kurth, W. S. [University of Iowa > Department of Physics and Astronomy > > >]
Gurnett, D. A. [Department of Physics and Astronomy, University of Iowa, Iowa City, IA, USA]
Clarke, J. T. [Center for Space Physics Boston University, Boston, USA]
Nichols, J. D. [Department of Physics and Astronomy, University of Leicester, Leicester, UK]
Gérard, Jean-Claude mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) >]
Grodent, Denis mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) >]
Dougherty, M. K. [Blackett Laboratory, Imperial College, London, UK]
Pryor, W. R. [Central Arizona College, Coolidge, AZ, USA]
1-Dec-2009
Planetary and Space Science
Pergamon Press - An Imprint of Elsevier Science
57
1732-1742
Yes (verified by ORBi)
International
0032-0633
[en] Cassini ; Saturn ; aurora ; magnetosphere
[en] We demonstrate that under some magnetospheric conditions protons and oxygen ions are accelerated once per Saturn magnetosphere rotation, at a preferred local time between midnight and dawn. Although enhancements in energetic neutral atom (ENA) emission may in general occur at any local time and at any time in a Saturn rotation, those enhancements that exhibit a recurrence at a period very close to Saturn's rotation period usually recur in the same magnetospheric location. We suggest that these events result from current sheet acceleration in the 15-20 Rs range, probably associated with reconnection and plasmoid formation in Saturn's magnetotail. Simultaneous auroral observations by the Hubble Space Telescope (HST) and the Cassini Ultraviolet Imaging Spectrometer (UVIS) suggest a close correlation between these dynamical magnetospheric events and dawn-side transient auroral brightenings. Likewise, many of the recurrent ENA enhancements coincide closely with bursts of Saturn kilometric radiation, again pointing to possible linkage with high latitude auroral processes. We argue that the rotating azimuthal asymmetry of the ring current pressure revealed in the ENA images creates an associated rotating field aligned current system linking to the ionosphere and driving the correlated auroral processes.
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/75710
10.1016/j.pss.2009.04.002
http://adsabs.harvard.edu/abs/2009P%26SS...57.1732M

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