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Time-Distance Helioseismology. I
1. Basic principles of time-distance helioseismology
2. Relationship between oscillation frequencies and travel times
3. Cross-covariance function and phase and group travel times.
4. Ray approximation and travel-time sensitivity kernels.
5. Effects of plasma flows and magnetic fields
6. Time-distance helioseismology in the Born approximation
7. Effects of stochastic excitation of solar oscillations, noise estimates
Time-Distance Helioseismology. II
1. Time-distance inversion methods and algorithms
2. Simulations and tests
3. Overview of the main results
4. Large-scale plasma flows in the convection zone
5. Supergranulation
6. Structure and dynamics of sunspots
7. Imaging of emerging active regions
8. Current problems and perspectives
References.
1. Duvall, T.L., Jr, Jefferies, S. M., Harvey, J. W., Pomerantz, M. A., 1993, Time-distance helioseismology, Nature, vol.362, 430-432.
2. Kosovichev, A.G. & Duvall, T.L., Jr, 1997, Acoustic tomography of solar convective flows and structures, in: SCORe'96 : Solar Convection and Oscillations and their Relationship, Proceedings of a workshop, held in Aarhus, Denmark, May 27 - 31, 1996, Eds.: F.P. Pijpers, J. Christensen-Dalsgaard, and C.S. Rosenthal, Kluwer Academic Publishers (Astrophysics and Space Science Library Vol. 225), p. 241-260
3. Kosovichev, A.G. Duvall, T.L., Jr, Scherrer, P.H. 2000, Time-Distance Inversion Methods and Results, Solar Phys., v. 192, 159-176
4. Jensen, J. M., Jacobsen, B. H., Christensen--Dalsgaard, J. 1998, MCD Inversion for Sound Speed using Time-Distance Data, in: Structure and Dynamics of the Interior of the Sun and Sun-like Stars , Proc. SOHO 6/GONG 98 Workshop, ESA Sp-418, 635-640
5. Birch, A. C., Kosovichev, A. G., Price, G. H., Schlottmann, R. B., 2001, The Accuracy of the Born and Ray Approximations in Time-Distance Helioseismology, Astrophysical Journal, Volume 561, Issue 2, pp. L229-L232.
6. Gizon, L. and Birch, A.C., 2002, Time-Distance Helioseismology: The Forward Problem for Random Distributed Sources, Astrophysical Journal, Volume 571, Issue 2, pp. 966-986
7. Birch, A. C.; Kosovichev, A. G.; Duvall, T. L., Jr. , 2004, Sensitivity of Acoustic Wave Travel Times to Sound-Speed Perturbations in the Solar Interior, Astrophysical Journal, Volume 608, Issue 1, pp. 580-600.
8. Zhao, J., Kosovichev, A. G., Duvall, Thomas L., Jr. 2001, Investigation of Mass Flows beneath a Sunspot by Time-Distance Helioseismology, Astrophysical Journal, Volume 557, Issue 1, pp. 384-388.