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BEGIN:VEVENT
DTSTAMP:20260428T014711Z
DTSTART;VALUE=DATE-TIME:20171207T140000
DTEND;VALUE=DATE-TIME:20171207T150000
SUMMARY:Kirill Kuzanyan (Russian Academy of Sciences\, National Astronomi
 cal Observatory of Chinese Academy of Sciences): Helicity and Twist of S
 olar Magnetic Fields: an Intrinsic Property of the Dynamo Mechanism.
TZID:Europe/London
UID:20171207-8a17841b5fc5a1d1015fcad2613a4249@warwick.ac.uk
CREATED:20171117T163145Z
DESCRIPTION:Solar Magnetism known for its 11-year cyclicity is driven by 
 the shear\, internal differential rotation in the solar convection zone\
 , and the breakage of mirror-symmetry of turbulent convective motion (ki
 netic and magnetic helicity). The origin of helicity comes from backgrou
 nd turbulent dynamo action as well as large-scale tilt of bipolar magnet
 ic flux tubes\, the building material for sunspots. We carry out quantit
 ative computations of the amounts of helicity in bipolar solar active re
 gions produced by tilting the flux tubes and compare with those produced
  by the global dynamo. We obtain that these amounts are comparable by th
 e order of magnitude though opposite in sign. We conclude that in smalle
 r active regions the dynamo-born helicity dominate its tilt-related part
 . The amount of helicity residing in the solar photosphere (that can be 
 observed from available magnetographic data) can be considered as the re
 mainder from the amounts of helicity produced and those leaving the Sun 
 with CMEs and solar wind. We give observational interpretation and suppo
 rt of the results.
LOCATION:MAS2.05
CATEGORIES:CFSA Seminar
LAST-MODIFIED:20171130T122735Z
ORGANIZER;CN=Anne-Marie Broomhall:
END:VEVENT
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