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Title: CYCLIC THERMAL SIGNATURE IN A GLOBAL MHD SIMULATION OF SOLAR CONVECTION

Global magnetohydrodynamical simulations of the solar convection zone have recently achieved cyclic large-scale axisymmetric magnetic fields undergoing polarity reversals on a decadal time scale. In this Letter, we show that these simulations also display a thermal convective luminosity that varies in-phase with the magnetic cycle, and trace this modulation to deep-seated magnetically mediated changes in convective flow patterns. Within the context of the ongoing debate on the physical origin of the observed 11 yr variations in total solar irradiance, such a signature supports the thesis according to which all, or part, of the variations on decadal time scales and longer could be attributed to a global modulation of the Sun's internal thermal structure by magnetic activity.
Authors:
;  [1] ;  [2]
  1. Physics Department, Université de Montréal, Montréal (Canada)
  2. European Centre for Medium-Range Weather Forecasts, Reading (United Kingdom)
Publication Date:
OSTI Identifier:
22215375
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 777; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AXIAL SYMMETRY; CONVECTION; LUMINOSITY; MAGNETIC FIELDS; MAGNETOHYDRODYNAMICS; MODULATION; ORIGIN; RADIANT FLUX DENSITY; SIMULATION; SUN; TURBULENCE