Conférences et présentations orales

- 2018 -

  1. [popular science talk] Inversion du champ magnétique terrestre : quand la Terre perd le Nord
    Nathanael Schaeffer
    Pint of Science,
    Grenoble (France)
      [ pdf ]
  2. [invited talk] Geodynamo reversals and numerical simulations
    Nathanael Schaeffer
    Study of the Earth’s Deep Interior,
    Edmonton (Canada)
      [ pdf ]
  3. [poster] Can precession in liquid-metal spherical cores drive planetary magnetic fields ?
    Nathanael Schaeffer, David Cebron, Raphael Laguerre, Jerome Noir
    Study of the Earth’s Deep Interior,
    Edmonton (Canada)
      
  4. [poster] Torsional Alfv́en waves in a dipolar magnetic field : experiments and simulations
    Zahia Tigrine, Henri-Claude Nataf, Nathanael Schaeffer, Philippe Cardin, Franck Plunian
    Study of the Earth’s Deep Interior,
    Edmonton (Canada)
      
  5. [poster] Linear model of subgrid induction at the core surface in geodynamo simulation : impact for core flow reconstructions
    Nicolas Gillet, Julien Aubert, Nathanael Schaeffer
    Study of the Earth’s Deep Interior,
    Edmonton (Canada)
      

- 2017 -

  1. [poster] Exploring planetary core dynamics with the SINGE and XSHELLS codes
    N. Schaeffer, J. Vidal
    Frontiers in planetary core dynamics,
    Autrans (France)
      
  2. [talk] Subcritical convection in rapidly rotating liquid metal spheres
    Elliot Kaplan, Nathanaël Schaeffer, Philippe Cardin and
    Céline Guervilly, Jérémie Vidal
    MREP 2017,
    Cambridge (U.K.)
      [ pdf ]
  3. [poster] Turbulent Geodynamo simulations
    Nathanaël Schaeffer, Dominique Jault, Henri-Claude Nataf, Alexandre Fournier
    Fifty years after Roberts’ MHD : Dynamos and planetary flows today,
    Royal Astronomical Society, London (U.K.)
      [ pdf ]
  4. [invited talk] Simulations of the Earth’s magnetic field and length-of-day variations
    Nathanaël Schaeffer
    Séminaire temps-espace,
    Observatoire de Paris (France)
      [ pdf ]
  5. [invited talk] Recent results of numerical dynamos in spheres
    Nathanaël Schaeffer
    GDR Dynamo,
    IHP, Paris (France)
      [ pdf ]

- 2016 -

  1. [poster] Exploring planetary core dynamics with the SINGE and XSHELLS codes
    N. Schaeffer, J. Vidal, E. Kaplan, D. Cebron
    Study of the Earth’s Deep Interior,
    Nantes (France)
      [ poster ]
  2. [poster] Core Flows inferred from Geomagnetic Field Models and the Earth’s Dynamo
    N. Schaeffer, M.A. Pais, E. Lora Silva
    Study of the Earth’s Deep Interior,
    Nantes (France)
      [ hal ]
  3. [poster] Dissipation of free torsional eigenmodes and conductivity of the lowermost mantle
    D. Jault, N. Schaeffer, N. Gillet
    Study of the Earth’s Deep Interior,
    Nantes (France)
      
  4. [poster] Elliptical instability in stably stratified fluid interiors
    J. Vidal, R. Hollerbach, N. Schaeffer, D. Cebron
    Study of the Earth’s Deep Interior,
    Nantes (France)
      
  5. [poster] Global stability analysis of mechanically-driven flows in rigid rotating ellipsoids
    J. Vidal, D. Cebron, N. Schaeffer
    Study of the Earth’s Deep Interior,
    Nantes (France)
      
  6. [poster] Flow States in the Derviche Tourneur experiment
    E. Kaplan, H-C. Nataf, N. Schaeffer
    Study of the Earth’s Deep Interior,
    Nantes (France)
      
  7. [poster] Frequency spectrum of the geomagnetic field harmonic coefficients from dynamo simulations
    C. Bouligand, N. Gillet, D. Jault, N. Schaeffer, A. Fournier, J. Aubert
    Study of the Earth’s Deep Interior,
    Nantes (France)
      
  8. [poster] Instabilities induced by the precession of spherical shell
    R. Laguerre, D. Cebron, J. Noir, N. Schaeffer, V. Dehant
    Study of the Earth’s Deep Interior,
    Nantes (France)
      
  9. [poster] Latest news of the DTSOmega experiment
    H-C. Nataf, P. Cardin, E. Kaplan, N. Schaeffer, P. La Rizza, A. Richard, J-P. Masson, D. Grand
    Study of the Earth’s Deep Interior,
    Nantes (France)
      
  10. [poster] Force balance and wave motion in Earth’s core
    A Fournier, J Aubert, T. Gastine, N. Schaeffer
    Study of the Earth’s Deep Interior,
    Nantes (France)
      
  11. [poster] Diffusionless hydromagnetic modes in rotating ellipsoids : A road to weakly nonlinear models ?
    J. Vidal, D. Cebron, N. Schaeffer
    19eme Rencontre du non-linéaire,
    Paris (France)
      [ HAL | arXiv | pdf ]
  12. [poster] Modal stability analysis of mechanically-driven flows in rigid rotating ellipsoids
    J. Vidal, D. Cebron, N. Schaeffer
    19eme Rencontre du non-linéaire,
    Paris (France)
      [ pdf ]
  13. [poster] Modal stability analysis of mechanically-driven flows in rigid rotating ellipsoids
    J. Vidal, D. Cebron, N. Schaeffer
    Emil Hopfinger Colloquium,
    Grenoble (France)
      
  14. [invited talk] Hydromagnetic waves and modes in the Earth’s core, influence of stratification and mantle conductivity
    N. Schaeffer, D. Jault, J. Vidal
    séminaire à l’observatoire,
    Bruxelles (Belgique)
      

- 2015 -

  1. [invited talk] Geodynamo Simulations with XSHELLS + SHTns
    Nathanael Schaeffer
    Geodynamo Benchmarking Workshop,
    NCAR, Boulder (USA)
      [ pdf ]
  2. [invited talk] High resolution geodynamo simulations with strongly-driven convection and low viscosity
    N. Schaeffer, A. Fournier, D. Jault, J. Aubert
    EGU General Assembly,
    Vienna (Austria)
      [ pdf | adsabs ]
  3. [invited talk] High resolution geodynamo simulations with strongly-driven convection and low viscosity
    N. Schaeffer, A. Fournier, D. Jault, J. Aubert
    AGU/CGU Joint Assembly,
    Montreal (Canada)
      
  4. [poster] Turbulence Reduces Magnetic Diffusivity in a Liquid Sodium Experiment
    H.-C. Nataf, S. Cabanes, N. Schaeffer
    Physics of Exoplanets : From Earth-sized to Mini-Neptunes,
    KITP Santa Barbara (USA)
      [ adsabs ]
  5. [poster] Turbulence in Planetary Cores
    H.-C. Nataf, N. Schaeffer
    Physics of Exoplanets : From Earth-sized to Mini-Neptunes,
    KITP Santa Barbara (USA)
      

- 2014 -

  1. [invited talk] Rotating dynamo turbulence : theoretical and numerical insights
    Nathanael Schaeffer, A. Fournier, J. Aubert, D. Jault, F. Plunian, P. Zitzke
    Mathematics of Turbulence : Geophysical and Astrophysical Turbulence,
    IPAM, Los Angeles (USA)
      [ pdf | video | pdf ]
  2. [talk] Rotating dynamo turbulence in numerical simulations
    Nathanael Schaeffer, A. Fournier, J. Aubert, D. Jault, F. Plunian, P. Zitzke
    Leverhulme trust kickoff meeting : Waves and Turbulence in Rotating, Stratified and Electrically Conducting Fluids,
    Cambridge (UK)
      [ pdf ]
  3. [talk] Turbulence reduces magnetic diffusivity in DTS liquid sodium experiment
    Simon Cabanes, Nathanaël Schaeffer, Henri-Claude Nataf
    AGU Fall Meeting,
    San Francisco (USA)
      
  4. [talk] Filtering of short-term fluctuations of the dynamo field through the electrically conducting mantle
    Dominique Jault, Nathanaël Schaeffer
    AGU Fall Meeting,
    San Francisco (USA)
      
  5. [talk] Dynamo Driven By Inertial Instabilities, Application to the Moon
    D. Cebron, R. Hollerbach, S. Vantieghem, J. Noir, N. Schaeffer
    AGU Fall Meeting,
    San Francisco (USA)
      [ adsabs ]

- 2013 -

  1. [talk] Turbuence in geodynamo simulations
    N Schaeffer, A Fournier, J Aubert
    European Turbulence Conference 14,
    Lyon (FR)
      [ pdf ]
  2. [talk] Turbulence in the magnetostrophic regime
    S Cabanes, H-C Nataf, N Schaeffer
    European Turbulence Conference 14,
    Lyon (FR)
      [ pdf ]
  3. [poster] Natural Turbulence From Centimeters to Megameters
    Henri-Claude Nataf, Nathanaël Schaeffer
    AGU Fall Meeting,
    San Francisco (USA)
      
  4. [poster] Assessing the significance of QG-flow modes computed using Principal Component Analysis
    M Alexandra Pais, Anna Morozova, Nathanael Schaeffer
    EGU General Assembly,
    Vienna (Austria)
      [ pdf | adsabs ]

- 2012 -

  1. [poster] Can a sinking metallic diapir generate a dynamo ?
    N Schaeffer, J Monteux, H Amit, P Cardin
    AGU,
    San Francisco (US)
      [ pdf ]
  2. [poster] On the reflection of Alfvén waves and its implication for Earth’s core modeling
    N Schaeffer, D Jault, P Cardin
    SEDI,
    Leeds (UK)
      
  3. [poster] Can a sinking metallic diapir generate a dynamo ?
    J Monteux, N Schaeffer, H Amit, P Cardin
    SEDI,
    Leeds (UK)
      
  4. [poster] Core flow inversion and the geodynamo
    M A Pais, N Schaeffer
    SEDI,
    Leeds (UK)
      
  5. [poster] Nested synthetic databases of observations for geomagnetic data
    assimilation practice : interannual to decadal time scales.

    N Schaeffer, A Fournier, J Aubert, E Thebault
    SEDI,
    Leeds (UK)
      
  6. [poster] Nested synthetic databases of observations for geomagnetic data
    assimilation practice : millennial to centennial time scales.

    A Fournier, J Aubert, E Thebault, N Schaeffer
    SEDI,
    Leeds (UK)
      
  7. [poster] Turbulence in the magnetostrophic regime.
    S Cabanes, HC Nataf, N Schaeffer
    SEDI,
    Leeds (UK)
      
  8. [talk] On the role of boundary layer instabilities in core dynamics
    HC Nataf, A Figueroa, N Schaeffer, D Schmitt
    EGU,
    Vienna (Austria)
      [ pdf ]
  9. [poster] A database of synthetic observations for geomagnetic data assimilation practice
    A Fournier, J Aubert, E Thebault, N Schaeffer
    EGU,
    Vienna (Austria)
      [ pdf ]
  10. [invited talk] Fast transients in 3D dynamo models
    A Fournier, N Schaeffer, J Aubert
    AGU Fall Meeting,
    San Francisco (US)
      [ pdf ]

- 2011 -

  1. [talk] Information on the Motions within the Earth’s Core and on the Geomagnetic Field prior to Geomagnetic Data Inversion
    D Jault, N Gillet, N Schaeffer
    AGU Fall Meeting,
    San-Francisco (USA)
      [ pdf ]
  2. [talk] Can a sinking metallic diapir generate a dynamo ?
    J Monteux, N Schaeffer, H Amit, P Cardin
    EPSC-DPS,
    Nantes (France)
      [ pdf ]
  3. [invited talk] Quasi-Geostrophic Flows in the Earth Core as a Source for the Secular Variation
    N. Schaeffer, Marie Drouard, Nicolas Gillet, Dominique Jault, Alexandra Pais, Franck Plunian
    EGU,
    Vienna (Austria)
      [ pdf ]
  4. [poster] Symmetry, anisotropy and scales in the Earth-core flow and their effect on the Length-of-Day variation predictions
    N. Schaeffer, M.A. Pais
    EGU,
    Vienna (Austria)
      [ pdf ]
  5. [poster] A dynamo driven by zonal jets at the upper surface in the giant planets
    C. Guervilly, P. Cardin, N. Schaeffer
    EGU,
    Vienna (Austria)
      [ pdf ]

- 2010 -

  1. [lecture] Magnetohydrodynamique & Dynamo : Turbulence et Ordre
    N. Schaeffer
    Ecole thematique systemes complexes,
    Rennes (France)
      
  2. [talk] Towards a faster Spherical Harmonic transform
    N. Schaeffer
    28/th IUGG Conference on Mathematical Geophysics,
    Pisa (Italy)
      
  3. [poster] Rationale and geophysical evidence for quasi-geostrophic rapid dynamics within the Earth’s outer core
    N. Gillet, N. Schaeffer, D. Jault
    28/th IUGG Conference on Mathematical Geophysics,
    Pisa (Italy)
      
  4. [poster] Extending the Quasi-Geostrophic flow model for core flow inversions.
    A. Pais, N. Schaeffer
    28/th IUGG Conference on Mathematical Geophysics,
    Pisa (Italy)
      

- 2009 -

  1. [talk]
    N Schaeffer
    Centro de Fisica Computacional,
    Coimbra (Portugal)
      
  2. [talk] Quasi-geostrophic waves in the Earth Core.
    N. Schaeffer, D. Jault
    Waves and Instabilities in Geophysical and Astrophysical Flows",
    Porquerolles (France)
      
  3. [talk] Quasi-geostrophic MHD waves in the Earth Core.
    N. Schaeffer, D. Jault
    Workshop "Wave Turbulence",
    Paris (France)
      

- 2008 -

  1. [poster] Quasi-Geostrophic Motions in the Earth’s Core : in What Conditions are They Expected ?
    N. Schaeffer, D. Jault
    AGU Fall Meeting,
    San Francisco (USA)
      

- 2007 -

  1. [talk] MHD in plasma devices
    N. Schaeffer
    GDR Dynamo meeting,
    Paris (France)
      [ pdf ]
  2. [talk] Influence of an elliptic instability on the merging of a co-rotating vortex pair
    N. Schaeffer, S. Le Dizès
    Congrès Français de Mécanique,
    Grenoble (France)
      [ pdf ]
  3. [poster] Non-linear MHD analysis of Advanced Tokamak Scenario
    N. Schaeffer, P. Maget, H. Lütjens, G.T.A. Huysmans, JET EFDA contributors
    Proceedings of the 34th EPS Conference on Plasma Physics,
    Warsaw (Pologne)
      [ pdf ]
  4. [talk] Elliptic instabilities in vortex pairs with axial flow
    N. Schaeffer, S. Le Dizès, L. Lacaze
    FAR-Wake second annual review,
    Feb. 2007, Toulouse (France)
      

- 2006 -

  1. [talk] Instabilities in co-rotating vortices with axial flow
    N. Schaeffer, S. Le Dizès, L. Lacaze
    FAR-Wake WP1 meeting,
    Málaga (Spain)
      
  2. [talk] Instabilities in co-rotating vortices with axial flow
    N. Schaeffer, S. Le Dizès, L. Lacaze
    Euromech Fluid Mechanics Conference,
    Stockholm (Sweden)
      

- 2005 -

  1. [talk] Quasigeostrophic dynamos at low Magnetic Prandtl number
    N. Schaeffer, P. Cardin
    American Geophysical Union,
    San Francisco (USA)
      
  2. [poster] Quasigeostrophic dynamos at low Magnetic Prandtl number
    N. Schaeffer, P. Cardin
    IAGA,
    Toulouse (France)
      
  3. [talk] Quasigeostrophic dynamos at low Magnetic Prandtl number
    N. Schaeffer, P. Cardin
    European Geosciences Union,
    Vienne (Autriche)
      [ pdf ]
  4. [talk] Turbulence and Rossby waves in a rapidly rotating sphere
    N. Schaeffer, P. Cardin
    European Geosciences Union,
    Vienne (Autriche)
      [ pdf ]
  5. [talk] Quasi-geostrophic dynamos
    N. Schaeffer, P. Cardin
    Perm Dynamo Days,
    Perm (Russie)
      

- 2004 -

  1. [talk] Quasi-geostrophic dynamos
    N. Schaeffer, P. Cardin
    XXI International Congress of Theoretical and Applied Mechanics,
    Varsovie (Pologne)
      
  2. [talk] Scale separation approach for low Pm rotating dynamos
    N. Schaeffer, P. Cardin
    Joint meeting COST - GDR Dynamo,
    Paris (France)
      

- 2003 -

  1. [talk] Scale separation approach for low magnetic Prandtl number rotating dynamos
    N. Schaeffer, P. Cardin
    Subgrid Scale Turbulence Methods for Geodynamo Simulations workshop,
    Los Angeles (USA)
      
  2. [talk] Instabilities of internal shear layers in rotating fluids
    N. Schaeffer, P. Cardin
    IUGG,
    Sapporo (Japon)
      
  3. [talk] La dynamo terrestre, une approche hybride 2D-3D
    N. Schaeffer, P. Cardin
    Annual congres of the SFP,
    Lyon (France)
      
  4. [poster] Instabilities of rotating shear layers
    N. Schaeffer, P. Cardin
    Planetary dynamos summer school,
    Les Houches (France)
      

- 2002 -

  1. [poster] Stewartson layer instabilities
    N. Schaeffer, P. Cardin
    8th Symposium of Symposium on Earth Deep Interior,
    Lake Tahoe (USA)
      

- 2001 -

  1. [poster] Interaction of rising and sinking mantle plumes
    N. Schaeffer, M. Manga
    American Geophysical Union Spring Meeting,
    Boston (USA)