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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. Fully resolved quiet Sun magnetic fluxtubes. TexPoint fonts used in EMF. Read the TexPoint manual before you delete this box.: A A. kG fields in plage & network.

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Fully resolved quiet Sun magnetic fluxtubes

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  1. Andreas Lagg, MPS& IMaXand Sunrise team 2nd Sunrise Science Meeting, May 4-5 2010, Freiburg Fullyresolvedquiet Sun magneticfluxtubes TexPoint fonts used in EMF. Read the TexPoint manual before you delete this box.: AA

  2. kGfields in plage & network Unresolved: indirecttechniquesrequired • Stenflo (1973): lineratiotechnique • Fe 5250 lineweakenedby 50% in thenetwork • fieldstrengthupto 2kG • size 100-300 km

  3. kGfields in plage & network • Martinez-Pillet et al. (1997): inversions • AR plage: 1.4kG • verticalfields • requirefillingfactor

  4. kGfields in plage & network • Rüedi et al. (1992), Rabin (1992) • completesplittingofFe 15650 Å lines

  5. Temperatures in plage & network • Solanki (1986), Solanki & Brigljevic (1992) • temperatureofcontinuumforminglayersfromlineratiosof CI andFe II (Stokes I and V) • magneticelementshave on averagebrightercontinuumthanquiet Sun when FF issmall • derivedfrom FF 5-8% • 1000° hotterthanavg. quiet Sun in line-forminglayer

  6. Motivation Can wefinallyresolvethequiet Sun magneticstructures? I profileextremelyweak (7%) hightemperature large Stokes V (5%) ME-Inv.: ≥ 1 kG

  7. Tool: Inversions (non-ME) • numericalsolutionof RTE (SPINOR) • freeparameters:B, INC, AZI, VLOS – heightindependentVMIC (fix to 0.8km/s)VMAC (avg QS: 2km/s)T0, TGRAD • normalizationto HSRA (J.M. Borrero) • convolvewith 85mÅ Gaussian

  8. normalizationof Stokes profilestoaverage QS profile: • avg QS cont-level := 1 • avg QS = HSRASP • change HSRASP with linear gradient(T0, TGRAD) HSRA cont. :=1(=avg. quiet Sun)

  9. networkpatch centerofgranule intergran. lane TexPoint fonts used in EMF. Read the TexPoint manual before you delete this box.: AA

  10. Summary & Conclusions Small 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?

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