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See detailA multi-scale magnetotail reconnection event at Saturn and associated flows: Cassini/UVIS auroral observations
Radioti, Aikaterini ULg; Grodent, Denis ULg; Jia, X. et al

Conference (2015)

We present high-resolution Cassini/UVIS (Ultraviolet Imaging Spectrograph) observations of Saturn's aurora during May 2013 (DOY 140-141). The observations reveal an enhanced auroral activity in the ... [more ▼]

We present high-resolution Cassini/UVIS (Ultraviolet Imaging Spectrograph) observations of Saturn's aurora during May 2013 (DOY 140-141). The observations reveal an enhanced auroral activity in the midnight-dawn quadrant in an extended local time sector (~02 to 05 LT), which rotates with an average velocity of ~ 45% of rigid corotation. The auroral dawn enhancement reported here, given its observed location and brightness, is most probably due to hot tenuous plasma carried inward in fast moving flux tubes returning from a tail reconnection site to the dayside. These flux tubes could generate intense field-aligned currents that would cause aurora to brighten. However, the origin of tail reconnection (solar wind or internally driven) is uncertain. Based mainly on the flux variations, which do not demonstrate flux closure, we suggest that the most plausible scenario is that of internally driven tail reconnection which operates on closed field lines. The observations also reveal multiple intensifications within the enhanced region suggesting an x-line in the tail, which extends from 02 to 05 LT. The localised enhancements evolve in arc and spot-like small scale features, which resemble vortices mainly in the beginning of the sequence. These auroral features could be related to plasma flows enhanced from reconnection which diverge into multiple narrow channels then spread azimuthally and radially. We suggest that the evolution of tail reconnection at Saturn may be pictured by an ensemble of numerous narrow current wedges or that inward transport initiated in the reconnection region could be explained by multiple localised flow burst events. The formation of vortical-like structures could then be related to field-aligned currents, building up in vortical flows in the tail. An alternative, but less plausible, scenario could be that the small scale auroral structures are related to viscous interactions involving small-scale reconnection. [less ▲]

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See detailComparative magnetotail flapping: An overview of selectec events ad Earth, Jupiter and Saturn
Volwerk, M.; Andre, N.; Arridge, C. et al

in Annales Geophysicae [= ANGEO] (2013)

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See detailComparative magnetotail flapping: Overview of observations at Earth, Jupiter and Saturn
Volwerk, M.; Andre, N.; Arridge, C. et al

Conference (2011)

Detailed reference viewed: 6 (0 ULg)
See detailAn overview of the aims and plans of an ISSI Team: Investigating the Dynamics of Planetary Magnetotails
Jackman, C.; Andre, N.; Arridge, C. et al

Poster (2011)

Detailed reference viewed: 8 (0 ULg)
See detailComparative Planetary Magnetotails
Bagenal, F.; Jackman, C.; Slavin, J. et al

Poster (2011)

Detailed reference viewed: 7 (0 ULg)
See detailThe very busy auroral footprint of Ganymede
Grodent, Denis ULg; Bonfond, Bertrand ULg; Radioti, Aikaterini ULg et al

Conference (2009, September 13)

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See detailSimulations of Structures in Packed Columns and Validation by X-ray Tomography
Caulkin, R.; Jia, X.; Xu, C. et al

in Industrial & Engineering Chemistry Research (2009), 48(1), 202-213

Packing simulations of generic, nonspherical pellets were performed and compared with experimental data sets obtained using X-ray Computerized tomography (CT). Two modified versions of what was previously ... [more ▼]

Packing simulations of generic, nonspherical pellets were performed and compared with experimental data sets obtained using X-ray Computerized tomography (CT). Two modified versions of what was previously a purely geometrical, digitally based packing algorithm were implemented. Both are aimed at incorporating the effects of particle interaction forces, one utilizing the distinct element method (DigiDEM) and the other an intermediate solution (collision-guided packing or DigiCGP). This article summarizes the models and the simulations performed using these two modified versions of DigiPac and, for model validation purposes, compares the predicted results with the corresponding X-ray tomographic scans of packed columns, in terms of bulk density, local packing density profiles, and pellet orientation distributions. For packed beds of relatively large and identical pellets, the simulation results indicate that particle-particle and particle-wall interactions cannot be ignored if realistic packing structures are to be obtained by simulation and even a simplistic treatment of these interactions can produce significantly more realistic packing structure than none at all. [less ▲]

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See detailValidation of DigiPac Simulations of packed columns using x-ray microtomography
Jia, X.; Xu, C.; Caulkin, R. et al

in Mc Cann, H.; Johansen, G. A. (Eds.) Proceedings of the 5th World Congress on Industrial Process Tomography, Bergen, Norway, September 6-9, 2007 (2007, September)

Detailed reference viewed: 40 (7 ULg)