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

Just what is inside a star ?Just what is inside a star ?

ArnaldoArnaldoPOMODOROPOMODORO

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

Mean Angular Velocity ProfilesMean Angular Velocity Profiles

TACHOCLINETACHOCLINE NEAR-SURFACENEAR-SURFACESHEAR LAYERSHEAR LAYER

CZ BOTTOMCZ BOTTOM

HMI-landHMI-land

Theoretical Solar CycleTheoretical Solar Cycle

PHOTOSPHEREPHOTOSPHERE

CONVECTIONCONVECTION ZONEZONE

TACHOCLINETACHOCLINE

RADIATIVE RADIATIVE INTERIORINTERIOR

LOCALLOCALDYNAMODYNAMO

GLOBALGLOBALDYNAMODYNAMOBUOYANCYBUOYANCY

PUMPINGPUMPING

EMERGINGEMERGING LOOPLOOP

ROTATION ROTATION

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

Global View of Radial VelocityGlobal View of Radial Velocity

But can we detect such giant cells by But can we detect such giant cells by helioseismic observation?helioseismic observation?

Giant cells:Giant cells:complex complex evolving evolving structuresstructures

Propagating and evolving velocity patternsPropagating and evolving velocity patterns

Time-longitude mapTime-longitude map (relative to Carrington) at 20 degrees north

+5d +10d

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

Ring AnalysesRing Analyses: Two Successive Rotations: Two Successive Rotations

7 Mm7 Mm

19971997

CRCR19231923

CRCR19221922

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)

SSW Evolution Near Active ComplexesSSW Evolution Near Active Complexes

High-Resolution Ring AnalysisHigh-Resolution Ring Analysis

Evolution in Doppler Correlation TrackingEvolution in Doppler Correlation Tracking Lisle, DeRosa Lisle, DeRosa

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

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