{
  "id": "0901.2364",
  "version": "v3",
  "published": "2009-01-15T22:58:53.000Z",
  "updated": "2010-07-17T07:48:27.000Z",
  "title": "Oscillatory migrating magnetic fields in helical turbulence in spherical domains",
  "authors": [
    "Dhrubaditya Mitra",
    "Reza Tavakol",
    "Petri J. Käpylä",
    "Axel Brandenburg"
  ],
  "comment": "Consistent with the published verstion (emulateapj)",
  "journal": "Astrophys. J.719:L1-L4, 2010",
  "doi": "10.1088/2041-8205/719/1/L1",
  "categories": [
    "astro-ph.SR",
    "astro-ph.EP"
  ],
  "abstract": "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-scale magnetic 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 time scales 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.",
  "revisions": [
    {
      "version": "v3",
      "updated": "2010-07-17T07:48:27.000Z"
    }
  ],
  "analyses": {
    "publication": {
      "journal": "The Astrophysical Journal",
      "year": 2010,
      "month": "Aug",
      "volume": 719,
      "number": 1
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 811146,
      "adsabs": "2010ApJ...719L...1M"
    }
  }
}