Astronomy and Astrophysics – Astronomy
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.8907d&link_type=abstract
American Astronomical Society, 200th AAS Meeting, #89.07; Bulletin of the American Astronomical Society, Vol. 34, p.792
Astronomy and Astrophysics
Astronomy
Scientific paper
Motivated by recent findings that the interaction of a magnetic sheet with stratified convection induces a strong tendency for pumping the magnetic fields downward (Dorch & Nordlund 2001, A&A, 365, 562), we explore the implications of such downward transport of magnetic field using a kinematic, flux-transport dynamo. We formulate the pumping effect by prescribing it as a flow field in addition to differential rotation and meridional circulation in such a way as to conserve the mass. The primary aim of such study is to investigate whether in the presence of such downward pumping the Babcock-Leighton flux-transport dynamo can withstand the parity selection issue. It has recently been shown that the formation of an elongated equatorial dipole is necessary for coupling N&S hemispheres through the antisymmetric magnetic field about the equator (Dikpati & Gilman 2001, ApJ, 559, 428), as inferred from Hale's polarity observation. Poloidal fields generated in a Babcock-Leighton model fail to do so because they undergo large decay during their long traversal to reach the equator at the shear layer. Present study indicates that the inclusion of a strong downward pumping ( ~ 10 m/s) in a Babcock-Leighton flux-transport dynamo can indeed provide additional downward speed for the transport of flux for forming the extended dipole at the base of the convection zone and hence, regain the solar-like mode-symmetry. This work has been supported by NASA grants W-19752 and S-10145-X.
Dikpati Mausumi
van Ballegooijen Adriaan A.
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