@article{PAR00009450,
  title = {{C}an a sinking metallic diapir generate a dynamo ?},
  author = {{M}onteux, {J}. and {S}chaeffer, {N}. and {A}mit, {H}. and {C}ardin, {P}hilippe},
  editor = {},
  language = {{ENG}},
  abstract = {{M}etallic diapirs may have strongly contributed to core formations during the first million years of planetary evolutions. {T}he aim of this study is to determine whether the dynamics induced by the diapir sinking can drive a dynamo and to characterize the required conditions on the size of the diapir, the mantle viscosity and the planetary latitude at which the diapir sinks. {W}e impose a classical {H}adamard flow solution for the motion at the interface between a spherical sinking diapir and a viscous mantle on dynamical simulations that account for rotational and inertial effects in order to model the flow within the diapir. {T}he flows are confined to a velocity layer with a thickness that decreases with increasing rotation rate. {T}hese 3{D} flows are is then used as input for kinematic dynamo simulations to determine the critical magnetic {R}eynolds number for dynamo onset. {O}ur results demonstrate that the flow pattern inside a diapir sinking into a rotating planet can generate a magnetic field. {L}arge diapirs ( {R} > 10 km) sinking in a mantle with a viscosity ranging from 10(9) to 10(14) {P}a. s provide plausible conditions for a dynamo. {E}quatorial sinking diapirs are confined to a thicker velocity layer and are thus possibly more favorable for dynamo generation than polar sinking diapirs. {I}n addition equatorial sinking diapirs produce stronger saturated magnetic fields. {H}owever, for the range of parameters studied here, estimation of the intensity of diapir-driven magnetic fields suggests that they could not have contributed to the lunar or {M}artian crustal paleomagnetic fields.},
  keywords = {},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch. {P}lanets},
  volume = {117},
  numero = {},
  pages = {{E}10005},
  ISSN = {0148-0227},
  year = {2012},
  DOI = {10.1029/2012je004075},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00009450},
}