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UID:69e139bbcebb5
DTSTAMP:20260416T153419
DTSTART:20130411T113000
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20130411T123000
URL:https://murmitoyen.com/events/vanille/udem/detail/219232
LOCATION:Université de Montréal - Pavillon Roger-Gaudry\, 2900\, chemin d
 e la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:Thermal signature in global MHD simulations of the solar convection
  zone
DESCRIPTION:Jean-François Cossette\, Université de MontréalRésumé/abs
 tract:Total solar irradiance (TSI) is the total power of the solar electro
 magnetic radiation integrated over all wavelengths that is received per un
 it area by a detector placed at 1 AU from the Sun. The TSI has been measur
 ed almost continuously since the 1980s by several space instruments and is
  now know to vary in phase with the 11-year solar sunspot number with an a
 mplitude corresponding to 0.1 percent of its mean value. Although most of 
 the variability can be explained by taking into account cumulative effects
  of sunspots\, faculae and other magnetic structures present at the Sun's 
 surface\, the question whether or not global structural changes of the sta
 r may also contribute to the irradiance cycle remains unanswered. Recent g
 lobal MHD simulations of the solar convection zone (SCZ) produced large-sc
 ale magnetic cycles with polarity reversals similar in many aspects to tho
 se observed on the Sun. These simulations also show a thermal signature pe
 rvading the whole SCZ that varies in phase with the magnetic cycle and the
 refore offer the chance to assess the impact that global structural change
 s would have on TSI fluctuations. Ce séminaire est présenté par le gro
 upe astronomie et astrophysique du Département de physique de l'Universi
 té de Montréal.
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