The Acoustic Showerglass

1
The Acoustic Showerglass

• C. Lindsey and D. C. Braun

2
Seismic Holography
3
Vantages

• a) Subjacent----------
• b) Lateral -------------

4
The Phase Asymmetry
5

• Statistics of local eression control correlation
  as a function of magnetic field

6

• Statistics of local ingression control
  correlation as a function of manetic field.

7
The Penumbral Acoustic Anomaly
8

• Lateral Vantage Egression-Ingression Correlations
  (left column) and Greens functions (right) over
  lateral-vantage pupils.

9

• Lateral vantage phase correlations of active
  region (left column) compared with the same
  applied to the quiet Sun with showerglass
  correction applied in phase reverse (right).

10

• Diagnostic south-north plot of egression-ingressio
  n correlation through large sunspot.

11
Cool-Hot Model

• Model of simple acoustic anomaly characterized by
  constant sound speed deficit (cool) in the depth
  range 0-3 Mm with underlying constant sound-speed
  excess from 3-10 Mm.

12
Depression Model

• Model of 350 km Wilson depression (closely
  equivalent to a superficial sound speed excess).

13
Showerglass Corrected Phase Correlations

• Showerglass corrected correlation phases. Left
  column shows phase maps at same contrast as
  uncorrected phases (slides 8 and 9). Right
  column shows phases at contrast enhanced by
  factor of 3.

14
Showerglass Corrected Phase Correlations

• Showerlass corrected correlation phases are
  integrated over two consecutive 10-hr time series
  (left and right columns, respectively).

15
Showerglass Corrected Phase Correlations

• Consecutive showerglass corrected phase
  correlations with magnetic proxies temporally
  swapped to estimate errors due evolution of the
  active region during the integration.

16
Correlation Phases for Simple Acoustic Anomalies

• Correlations phases for Cool-Hot model and
  photospheric depression are compared with
  correlation phases of sunspots observed by MDI.