Holography of solar dynamics Doug Braun CoRA/NWRA.

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Presentation transcript:

holography of solar dynamics Doug Braun CoRA/NWRA

Braun LoHCo Feb long term goals nature & depth of supergranulation meridional circulation and its variation with time other large-scale flows and correlation with activity flows, travel-time perturbations in tachocline acoustic properties of solar poles

Braun LoHCo Feb progress report developing software for routine “full- disk” Doppler-sensitive holography analysis of CR 1988 for LoHCo –MDI and GONG comparisons comparisons with ring-diagram results systematic effects, artifacts

Braun LoHCo Feb lateral-vantage holography egression, ingression: correlation:

Braun LoHCo Feb Doppler diagnostics 4 egressions and 4 ingressions: 4 correlations: WE N S

Braun LoHCo Feb should invert correlation differences for flows are proportional to “flows” (really some weighted depth-average) For now, assume correlation phases differences

Braun LoHCo Feb full-disk phase-difference signatures

Braun LoHCo Feb 20048

9 analysis to date MDI –CR1988; 8 “days” (2002 Mar 30-Apr 7) –CR1948; 1 “day” (1999 Apr 20) GONG –CR1988; 2 “days” (2002 Mar 30-31)

Braun LoHCo Feb geometry Resolution limited by diffraction –spatial averaging at variety of scales 60° Postel projections –tracked at Carrington rate 3x3 tiling with 40° spacing Snodgrass rate subtracted –(except where noted)

Braun LoHCo Feb small scale flows MDI data, focus depth=3Mm –0°.5 spatial averaging supergranulation sunspots (outflows) active regions, plages, emerging region (inflows)

Braun LoHCo Feb supergranulation and inflow towards plage

Braun LoHCo Feb supergranulation: horizontal divergence

Braun LoHCo Feb supergranulation movie 1: 7 “days” (1 day=27.7hr)

Braun LoHCo Feb supergranulation movie 2: rapid, forward & back

Braun LoHCo Feb outflows in sunspot moats

Braun LoHCo Feb emerging-region inflow

Braun LoHCo Feb intermediate scale flows MDI & GONG – focus depth=3-30Mm(MDI), 7-30 (GONG) –  5° spatial averaging limb artifacts, MDI/GONG comparisons horizontal divergence vertical vorticity

Braun LoHCo Feb movie: MDI flow averages at different focus depths

Braun LoHCo Feb movie: GONG flow averages vs. depth

Braun LoHCo Feb GONG vs MDI scatter-plot comparisions red diamonds= points within central 40°x40°

Braun LoHCo Feb

Braun LoHCo Feb

Braun LoHCo Feb movie: horizontal divergence with time; association with active regions

Braun LoHCo Feb movie: magneogram, horizontal divergence, vertical vorticity

Braun LoHCo Feb longitude-averaged flows MDI/GONG comparison –differential rotation vs depth –meridional flow vs depth Snodgrass rotation has not been subtracted for these plots

Braun LoHCo Feb W flow N flow movie: MDI/GONG comparison, longitude-averaged flows

Braun LoHCo Feb residual longitude-averaged flows (GONG-MDI) W flow N flow

Braun LoHCo Feb Holography/ring-diagram comparisons flows at 3 Mm averaged over 15° diameter apodization disks 7°.5 spacing ring-diagram RLS inversions courtesy D. Haber

Braun LoHCo Feb movie: holography, ring-diagram comparison 2002 Mar 30

Braun LoHCo Feb

Braun LoHCo Feb

Braun LoHCo Feb movie: holography/ring-diagram comparison 1999 Apr 20

Braun LoHCo Feb

Braun LoHCo Feb