Geophysical and Astrophysical Fluid Dynamics

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Kronos: exploring the depths of Saturn with probes and remote sensing through an international mission

Experimental Astronomy Springer Nature 23:3 (2009) 947

Authors:

B Marty, T Guillot, A Coustenis, the Kronos consortium, N Achilleos, Y Alibert, S Asmar, D Atkinson, S Atreya, G Babasides, K Baines, T Balint, D Banfield, S Barber, B Bézard, GL Bjoraker, M Blanc, S Bolton, N Chanover, S Charnoz, E Chassefière, JE Colwell, E Deangelis, M Dougherty, P Drossart, FM Flasar, T Fouchet, R Frampton, I Franchi, D Gautier, L Gurvits, R Hueso, B Kazeminejad, T Krimigis, A Jambon, G Jones, Y Langevin, M Leese, E Lellouch, J Lunine, A Milillo, P Mahaffy, B Mauk, A Morse, M Moreira, X Moussas, C Murray, I Mueller-Wodarg, TC Owen, S Pogrebenko, R Prangé, P Read, A Sanchez-Lavega, P Sarda, D Stam, G Tinetti, P Zarka, J Zarnecki
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Mars environment and magnetic orbiter model payload

Experimental Astronomy Springer Nature 23:3 (2009) 761-783

Authors:

B Langlais, F Leblanc, T Fouchet, S Barabash, D Breuer, E Chassefière, A Coates, V Dehant, F Forget, H Lammer, S Lewis, M Lopez-Valverde, M Mandea, M Menvielle, A Pais, M Paetzold, P Read, C Sotin, P Tarits, S Vennerstrom, G Branduardi-Raymont, G Cremonese, JGM Merayo, T Ott, H Rème, JG Trotignon, JE Walhund
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Synchronization in a coupled two-layer quasigeostrophic model of baroclinic instability-Part 1: Master-slave configuration

Nonlinear Processes in Geophysics 16:4 (2009) 543-556

Authors:

AA Castrejón-Pita, PL Read

Abstract:

Synchronization is studied using a pair of diffusively-coupled, two-layer quasi-geostrophic systems each comprising a single baroclinic wave and a zonal flow. In particular, the coupling between the systems is in the well-known master-slave or one-way configuration. Nonlinear time series analysis, phase dynamics, and bifurcation diagrams are used to study the dynamics of the coupled system. Phase synchronization, imperfect synchronization (phase slips), or complete synchronization are found, depending upon the strength of coupling, when the systems are either in a periodic or a chaotic regime. The results of investigations when the dynamics of each system are in different regimes are also presented. These results also show evidence of phase synchronization and signs of chaos control.
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Mars Environment and Magnetic Orbiter Scientific and Measurement Objectives

Astrobiology Mary Ann Liebert 9:1 (2009) 71-89

Authors:

F Leblanc, B Langlais, T Fouchet, S Barabash, D Breuer, E Chassefire, A Coates, V Dehant, F Forget, H Lammer, S Lewis, M Lopez-Valverde, M Mandea, M Menvielle, A Pais, M Paetzold, P Read, C Sotin, P Tarits, S Vennerstrom
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Synchronization of modulated traveling baroclinic waves in a periodically forced, rotating fluid annulus.

Phys Rev E Stat Nonlin Soft Matter Phys 79:1 Pt 2 (2009) 015202

Authors:

FJR Eccles, PL Read, AA Castrejón-Pita, TWN Haine

Abstract:

Frequency entrainment and nonlinear synchronization are commonly observed between simple oscillatory systems, but their occurrence and behavior in continuum fluid systems are much less well understood. Motivated by possible applications to geophysical fluid systems, such as in atmospheric circulation and climate dynamics, we have carried out an experimental study of the interaction of fully developed baroclinic instability in a differentially heated, rotating fluid annulus with an externally imposed periodic modulation of the thermal boundary conditions. In quasiperiodic and chaotic amplitude-modulated traveling wave regimes, the results demonstrate a strong interaction between the natural periodic modulation of the wave amplitude and the externally imposed forcing. This leads to partial or complete phase synchronization. Synchronization effects were observed even with very weak amplitudes of forcing, and were found with both 1:1 and 1:2 frequency ratios between forcing and natural oscillations.
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