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UID:submissions.pasc-conference.org_PASC22_sess181_pos116@linklings.com
SUMMARY:P45 - Dynamos in a Rapidly Rotating Full Sphere
DESCRIPTION:Poster\n\nP45 - Dynamos in a Rapidly Rotating Full Sphere\n\nL
 uo, Hardy, Marti, Jackson\n\nThe Earth’s magnetic field has existed for 4 
 Gyr. Before the onset of crystallisation of the solid inner core, and for 
 possibly 90% of Earth history, the relevant geometry was that of a full sp
 here. Numerical studies of the geodynamo in a full sphere are thus critica
 l for understanding the paleomagnetic field. However, direct numerical sim
 ulations of the dynamo problem in a whole sphere has been rare, partially 
 due to the difficulty of proper treatment of the singularity at the sphere
  center. Using a fully spectral method with basis functions being smooth e
 verywhere, we run a series of numerical simulations to investigate dynamos
  in a whole sphere. For various Ekman numbers E, measuring the effect of v
 iscosity compared to the Coriolis force, the dynamo regime dependence on t
 he Rayleigh number Ra (measuring thermal forcing) and the magnetic Prandtl
  number Pm (controlling electrical conductivity) was determined, and we fi
 nd it to be different from that of dynamos operating in a spherical shell.
  The regime of stable dipolar magnetic field seems to be narrower compared
  to the spherical shell case. We also report scaling analysis of the input
 /output quantities of our simulations.
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