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Survey of Magnetosheath Plasma Properties at Saturn and Inference of Upstream Flow Conditions

Thomsen, MF; Coates, AJ; Jackman, CM; Sergis, N; Jia, X; Hansen, KC; (2018) Survey of Magnetosheath Plasma Properties at Saturn and Inference of Upstream Flow Conditions. Journal of Geophysical Research: Space Physics , 123 (3) pp. 2034-2053. 10.1002/2018JA025214. Green open access

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Abstract

A new Cassini magnetosheath data set is introduced that is based on a comprehensive survey ofintervals in which the observed magnetosheath flow was encompassed within the plasma analyzer field ofview and for which the computed numerical moments are therefore expected to be accurate. The dataextend from 2004 day 299 to 2012 day 151 and comprise 19,155 416 s measurements. In addition to theplasma ion moments (density, temperature, and flow velocity), merged values of the plasma electron densityand temperature, the energetic particle pressure, and the magnetic field vector are included in the data set.Statistical properties of various magnetosheath parameters, including dependence on local time, arepresented. The magnetosheath field and flow are found to be only weakly aligned, primarily because of arelatively large z component of the magnetic field, attributable to the field being pulled out of the equatorialorientation by flows at higher latitudes. A new procedure for using magnetosheath properties to estimate theupstream solar wind speed is proposed and used to determine that the amount of electron heating atSaturn’s high Mach-number bow shock is ~4% of the dissipated flow energy. The data set is available assupporting information to this paper.

Type: Article
Title: Survey of Magnetosheath Plasma Properties at Saturn and Inference of Upstream Flow Conditions
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/2018JA025214
Publisher version: http://dx.doi.org/10.1002/2018JA025214
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Astronomy & Astrophysics, magnetosheath, Saturn, bow shock, SOLAR-WIND FLOW, CAPS ELECTRON SPECTROMETER, MAGNETIC-FIELD, CASSINI OBSERVATIONS, OUTER PLANETS, BOW SHOCK, MAGNETOPAUSE, MAGNETOSPHERE, JUPITER, TIME
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: http://discovery.ucl.ac.uk/id/eprint/10048307
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