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