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Resolving Quiet Sun Magnetic Structures - Sunrise Science Meeting

Explore the fully resolved quiet Sun magnetic flux tubes, field strengths, temperatures, and more from the 2nd Sunrise Science Meeting in Freiburg. Techniques like inversion and spectral analysis reveal fascinating insights.

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Resolving Quiet Sun Magnetic Structures - Sunrise Science Meeting

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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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