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DTSTAMP:20230831T095745Z
LOCATION:Davos
DTSTART;TZID=Europe/Stockholm:20230626T112000
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UID:submissions.pasc-conference.org_PASC23_sess104_pos108@linklings.com
SUMMARY:P24 - Geodynamo Simulations in a Full Sphere
DESCRIPTION:Poster\n\nFabian Burmann, Jiawen Luo, Philippe David Marti, an
 d Andrew Jackson (ETH Zurich)\n\nAlthough the geomagnetic field exists sin
 ce about 4 Gyr, recent estimates for the formation of the Earth's inner co
 re go back no further than 500 Myr to 1 Gyr. Here we run rapidly rotating 
 dynamos in a full sphere geometry, representative of the Earth's dynamo be
 fore the nucleation of the inner core. Numerically, the full sphere bears 
 the difficulty of an adequate treatment of the singularity at the center. 
 We perform a set of numerical simulations using a fully spectral simulatio
 n framework, where a careful choice of the radial basis functions resolves
  this singularity and allows us to systematically study the influence of t
 hree non-dimensional parameters, namely the Ekman number E (measuring visc
 ous to Coriolis force), the Rayleigh number Ra (measuring the convective f
 orcing) and the magnetic Prandtl number Pm (ratio of viscous and magnetic 
 diffusivity). The output of our simulations allows us to characterize the 
 dynamo regime as a function of Ra and Rm, which differs from similar diagr
 ams for spherical shell geometry. In particular, we find that the regime o
 f dipolar magnetic fields is narrower in the full sphere and a larger Pm i
 s needed for dynamo action. Finally, we derive scaling laws for input and 
 output parameters.\n\nSession Chair: Elaine M. Raybourn (Sandia National L
 aboratories)
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