Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 719, Issue 1, Pages L1-L4Publisher
IOP Publishing Ltd
DOI: 10.1088/2041-8205/719/1/L1
Keywords
Sun: dynamo
Categories
Funding
- European Research Council [227952]
- Swedish Research Council [621-2007-4064]
- Leverhulme Trust
- Academy of Finland [121431]
- UKMHD, QMUL
- National Supercomputer Centre in Linkoping in Sweden
- CSC-IT Center for Science in Espoo, Finland
- STFC [PP/C50209X/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/C50209X/1] Funding Source: researchfish
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [838261] Funding Source: National Science Foundation
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We present direct numerical simulations of the equations of compressible magnetohydrodynamics in a wedge-shaped spherical shell, without shear, but with random helical forcing which has negative (positive) helicity in the northern (southern) hemisphere. We find a large-scalemagnetic field that is nearly uniform in the azimuthal direction and approximately antisymmetric about the equator. Furthermore, the large-scale field in each hemisphere oscillates on nearly dynamical timescales with reversals of polarity and equatorward migration. Corresponding mean-field models also show similar migratory oscillations with a frequency that is nearly independent of the magnetic Reynolds number. This mechanism may be relevant for understanding equatorward migration seen in the solar dynamo.
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