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The Acoustic Showerglass

This study examines the phase asymmetry statistics of local expression and ingression control correlations as a function of magnetic field. It also explores the acoustic anomalies and correlations within active regions and compares them with the quiet Sun. The showerglass correction is applied to enhance contrast in the phase maps.

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The Acoustic Showerglass

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  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 Green’s 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-ingression 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.

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