Fully resolved quiet Sun magnetic fluxtubes
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FULLY RESOLVED QUIET SUN MAGNETIC
FLUXTUBES
Andreas Lagg, MPS& IMaX and Sunrise team
2nd Sunrise Science Meeting, May 4-5 2010, Freiburg
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kG fields in plage & networkUnresolved: indirect techniques required Stenflo (1973): line ratio technique
Fe 5250 line weakened by 50% in the networkfield strength up to 2kGsize 100-300 km
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kG fields in plage & network Martinez-Pillet et al.
(1997): inversionsAR plage: 1.4kGvertical fieldsrequire filling factor
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kG fields in plage & network Rüedi et al. (1992), Rabin (1992)
complete splitting of Fe 15650 Å lines
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Temperatures in plage & network Solanki (1986), Solanki &
Brigljevic (1992)temperature of continuum
forming layers from line ratios of CI and Fe II (Stokes I and V)
magnetic elements have on average brighter continuum than quiet Sun when FF is small
derived from FF 5-8% 1000° hotter than avg.
quiet Sun in line-forming layer
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Motivation I profile extremely
weak (7%) high temperature
large Stokes V (5%) ME-Inv.: ≥ 1 kG
Can we finally resolve the quiet Sun magnetic structures?
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Tool: Inversions (non-ME) numerical solution of RTE (SPINOR) free parameters:
B, INC, AZI, VLOS – height independentVMIC (fix to 0.8km/s)VMAC (avg QS: 2km/s)T0, TGRAD
normalization to HSRA (J.M. Borrero) convolve with 85mÅ Gaussian
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HSRA cont. :=1(=avg. quiet Sun)
normalization of Stokes profiles to average QS profile: avg QS cont-level := 1 avg QS = HSRASP change HSRASP with linear gradient
(T0, TGRAD)
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(1) network patch(2) center of granule(3) intergran. lane
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Summary & ConclusionsSmall scale flux tubes in quiet Sun: field strengths up to 1.3 kG temperatues at line formation height
1000 K higher than quiet Sun shallow temperature gradient
Without requiring a filling factor!
ubiquitous correlation with bright points? temporal evolution?