A.G. Kosovichev
. I present initial results of inversion of travel-time maps recently obtained by Duvall et al. (1995). The maps represent measurements of the time for acoustic waves to travel between points on a solar surface and surrounding annuli. The measurements are sensitive to perturbations of the sound spee...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.44.2731 http://quake.stanford.edu/~sasha/PAPERS/bombay_3d.ps |
| Summary: | . I present initial results of inversion of travel-time maps recently obtained by Duvall et al. (1995). The maps represent measurements of the time for acoustic waves to travel between points on a solar surface and surrounding annuli. The measurements are sensitive to perturbations of the sound speed and flows along the ray paths. A 3D inversion method based on Fermat's Principle and a conjugate-gradient technique have been applied to infer the sound speed and the velocity of flows from the observations obtained at the South Pole 4-5 Jan. 1991. The spatial resolution of the inversion is 1.75 degree in both longitude and latitude, and 15 Mm in depth. The results reveal large-scale subsurface structures and flows related to the active regions that are important for understanding the physics of solar activity and large-scale convection. Key words: helioseismology, convection zone, travel time, inversion 1. Introduction Duvall et al. (1995, 1996) have provided maps of travel times of so. |
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