dynamical implications juri toomre, jila helioseis: deborah haber, brad hindman + rick bogart,...
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Dynamical ImplicationsDynamical Implications
Juri Toomre, JILA Juri Toomre, JILA Helioseis:Helioseis: Deborah Haber, Deborah Haber, Brad Hindman + Rick Bogart, Douglas Gough, Brad Hindman + Rick Bogart, Douglas Gough,
Frank Hill, Jesper Schou, Mike ThompsonFrank Hill, Jesper Schou, Mike Thompson
Dynamics:Dynamics: Nic Brummell, Sacha Brun, Nic Brummell, Sacha Brun, Marc DeRosa, Mark MieschMarc DeRosa, Mark Miesch
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Just what is inside a star ?Just what is inside a star ?
ArnaldoArnaldoPOMODOROPOMODORO
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Objective 1:Objective 1: CZ dynamics & solar dynamo CZ dynamics & solar dynamo
• A. Structure and dynamics of A. Structure and dynamics of tachoclinetachocline
• B. Variations in B. Variations in differential rotationdifferential rotation
• C. Evolution in C. Evolution in meridional circulationmeridional circulation
• D. Dynamics in D. Dynamics in near-surface shear layernear-surface shear layer
Objective 2:Objective 2: Evolution of complexes of activity Evolution of complexes of activity
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Mean Angular Velocity ProfilesMean Angular Velocity Profiles
TACHOCLINETACHOCLINE NEAR-SURFACENEAR-SURFACESHEAR LAYERSHEAR LAYER
CZ BOTTOMCZ BOTTOM
HMI-landHMI-land
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Theoretical Solar CycleTheoretical Solar Cycle
PHOTOSPHEREPHOTOSPHERE
CONVECTIONCONVECTION ZONEZONE
TACHOCLINETACHOCLINE
RADIATIVE RADIATIVE INTERIORINTERIOR
LOCALLOCALDYNAMODYNAMO
GLOBALGLOBALDYNAMODYNAMOBUOYANCYBUOYANCY
PUMPINGPUMPING
EMERGINGEMERGING LOOPLOOP
ROTATION ROTATION
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Evolution in Radial Velocity (0.96 R)Evolution in Radial Velocity (0.96 R)
VIEWED INVIEWED IN`CARRINGTON’`CARRINGTON’ FRAMEFRAME
Case ECase EBrun, MieschBrun, Miesch & Toomre& Toomre
NEAR TOPNEAR TOPOF LAYEROF LAYER
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Global View of Radial VelocityGlobal View of Radial Velocity
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But can we detect such giant cells by But can we detect such giant cells by helioseismic observation?helioseismic observation?
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Giant cells:Giant cells:complex complex evolving evolving structuresstructures
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Propagating and evolving velocity patternsPropagating and evolving velocity patterns
Time-longitude mapTime-longitude map (relative to Carrington) at 20 degrees north
+5d +10d
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Big Questions:Big Questions: Global-Scale Convection Global-Scale Convection
• Why no clear or direct detectionWhy no clear or direct detection of giant convection cells?
• Does intense near-surface turbulenceDoes intense near-surface turbulence of granulation and supergranulation yield transport barrier to deflect such flows?
• May simply be very tough to detectMay simply be very tough to detect since narrow downflows but wide cell scales, and they both evolve and propagate
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Ring AnalysesRing Analyses: Two Successive Rotations: Two Successive Rotations
7 Mm7 Mm
19971997
CRCR19231923
CRCR19221922
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Changing Meridional Circulation CellsChanging Meridional Circulation Cells
20002000
19991999
19981998
NORTH:NORTH:DOUBLEDOUBLECELLCELL
NORTHNORTHSOUTHSOUTH
20012001
SOUTH:SOUTH:SINGLESINGLECELLCELL
POLEWARDPOLEWARDFLOW NEARFLOW NEARSURFACESURFACE
REVERSED REVERSED FLOWFLOWAT DEPTHAT DEPTH
19971997
19961996
Haber et al Haber et al (2002)(2002)
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SSW Evolution Near Active ComplexesSSW Evolution Near Active Complexes
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High-Resolution Ring AnalysisHigh-Resolution Ring Analysis
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Evolution in Doppler Correlation TrackingEvolution in Doppler Correlation Tracking Lisle, DeRosa Lisle, DeRosa
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Analysis StrategyAnalysis Strategy
• Devise some Devise some combinationcombination of local-domain of local-domain helioseismic probings to provide:helioseismic probings to provide:
• Nearly soon(real)-time, continuous Nearly soon(real)-time, continuous subsurface flow mappingssubsurface flow mappings in upper in upper 20+ Mm -- fast analysis pipes20+ Mm -- fast analysis pipes
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Our thrusts with rings (and time-distance)Our thrusts with rings (and time-distance)
• Re-evaluate ALL elementsRe-evaluate ALL elements in current ring procedures: mappings, ridge or ring fits, varying resolution across disk, line asymmetries vs varying background …
• Devise multi-scale tiling analysesDevise multi-scale tiling analyses, and build mature 3-D inversions for flow fields
• Test all with high-resolution MDITest all with high-resolution MDI Doppler data to verify procedures and codes