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Perturbation Map Generation

Description

  • Inputs: HMI tracked Dopplergrams of rectangular regions of solar disk.

  • Outputs: Travel-time anomaly maps for different skip distances; subsurface wavespeed anomalies under the tracked region obtained by inversion; combinations of wavespeed anomaly maps under tracked regions into synoptic maps.

  • Problem: Measure wavespeed anomalies in the upper convection zone and in particular under ARs to understand AR and sunspot subsurface structures and flux emergence

Literature Search

Pre-processing, Cross-correlation and travel-time mesurement
Title
Time-distance Measurements of Large Scale Flows in the Solar Convection Zone (Ph.D. Thesis)
Authour(s)
Peter M. Giles
URL
http://sun.stanford.edu/~giles/thesis/PDF/
Date Published
December 1999
Description
Detailed discussion of time-distance helioseismology with detailed description of data and filter used for pre-processing

Title
Time-distance Helioseismology: Noise Estimation
Authours
L. Gizon and A.C. Birch
Publication
The Astrophysical Journal, 614:472-489, 2004
URL
http://sun.stanford.edu/~gizon/PAPERS/apj_614_472.pdf
Date Published
2004 October 10
Description
robust definition of travel times

Forward problem, sensitivity kernels


Inversion

Title
Algorithm 583; LSQR: Sparse linear equations and least-squares problems
Authours
C. C. Paige and M. A. Saunders
Publication
ACM Transactions on Mathematical Software, Vol. 8, No. 2
URL
http://www.stanford.edu/group/SOL/software/lsqr/lsqr-toms82b.pdf
Date Published
June 1982
Description
Implementation of a conjugate-gradient type method for solving sparse linear equations and sparse least-squares problems.

Routines and Libraries

Test Data

  • SOHO/MDI tracked Doppler datacubes ?

Comments

-- ElizabethAuden - 11 Jan 2005

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Topic revision: r5 - 2005-05-23 - SergeiZharkov
 
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