Dynamical Implications Juri Toomre, JILA Helioseis: Deborah Haber, Brad Hindman + Rick Bogart, Douglas Gough, Frank Hill, Jesper Schou, Mike Thompson Dynamics:

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Presentation transcript:

Dynamical Implications Juri Toomre, JILA Helioseis: Deborah Haber, Brad Hindman + Rick Bogart, Douglas Gough, Frank Hill, Jesper Schou, Mike Thompson Dynamics: Nic Brummell, Sacha Brun, Marc DeRosa, Mark Miesch

Just what is inside a star ? Arnaldo ArnaldoPOMODORO

Objective 1: CZ dynamics & solar dynamo A. Structure and dynamics of tachoclineA. Structure and dynamics of tachocline B. Variations in differential rotationB. Variations in differential rotation C. Evolution in meridional circulationC. Evolution in meridional circulation D. Dynamics in near-surface shear layerD. Dynamics in near-surface shear layer Objective 2: Evolution of complexes of activity

Mean Angular Velocity Profiles TACHOCLINE NEAR-SURFACE SHEAR LAYER CZ BOTTOM HMI-land

Theoretical Solar Cycle PHOTOSPHERE CONVECTION ZONE ZONE TACHOCLINE RADIATIVE RADIATIVE INTERIOR INTERIOR LOCAL LOCALDYNAMO GLOBAL GLOBALDYNAMO BUOYANCY PUMPING EMERGING LOOP LOOP ROTATION ROTATION

Evolution in Radial Velocity (0.96 R) VIEWED IN VIEWED IN`CARRINGTON’ FRAME FRAME Case E Case E Brun, Miesch & Toomre & Toomre NEAR TOP OF LAYER

Global View of Radial Velocity

But can we detect such giant cells by helioseismic observation?

Giant cells: complex evolving structures

Propagating and evolving velocity patterns Time-longitude map (relative to Carrington) at 20 degrees north +5d+10d

Big Questions: 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 Analyses: Two Successive Rotations 7 Mm 1997 CR CR

Changing Meridional Circulation Cells NORTH:DOUBLECELL NORTHSOUTH 2001 SOUTH:SINGLECELL POLEWARD FLOW NEAR SURFACE REVERSEDFLOW AT DEPTH Haber et al (2002) (2002)

SSW Evolution Near Active Complexes

High-Resolution Ring Analysis

Evolution in Doppler Correlation Tracking Lisle, DeRosa Lisle, DeRosa

Analysis Strategy Devise some combination of local-domain helioseismic probings to provide:Devise some combination of local-domain helioseismic probings to provide: Nearly soon(real)-time, continuous subsurface flow mappings in upper 20+ Mm -- fast analysis pipesNearly soon(real)-time, continuous subsurface flow mappings in upper 20+ Mm -- fast analysis pipes

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