Browsing by Author "Birch, A. C"

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Impact of locally suppressed wave sources on helioseismic traveltimes

Hanasoge, S. M; Couvidat, S; Rajaguru, S. P; Birch, A. C (Royal Astronomical Society, 2008-12)

Wave traveltime shifts in the vicinity of sunspots are typically interpreted as arising predominantly from magnetic fields, flows and local changes in sound speed. We show here that the suppression of granulation related ...
Modeling the Subsurface Structure of Sunspots

Moradi, H; Baldner, C; Birch, A. C; Braun, D. C; Cameron, R. H; Duvall, T. L; Gizon, L; Haber, D; Hanasoge, S. M; Hindman, B. W; Jackiewicz, J; Khomenko, E; Komm, R; Rajaguru, S. P; Rempel, M; Roth, M; Schlichenmaier, R; Schunker, H; Spruit, H. C; Strassmeier, K. G; Thompson, M. J; Zharkov, S (Springer, 2010-11)

While sunspots are easily observed at the solar surface, determining their subsurface structure is not trivial. There are two main hypotheses for the subsurface structure of sunspots: the monolithic model and the cluster ...
Solar meridional circulation from twenty-one years of SOHO/MDI and SDO/HMI observations Helioseismic travel times and forward modeling in the ray approximation

Liang, Zhi-Chao; Gizon, L; Birch, A. C; Duvall, T. L. Jr; Rajaguru, S. P (EDP Sciences, 2018-11)

Context. The solar meridional flow is an essential ingredient in flux-transport dynamo models. However, no consensus on its subsurface structure has been reached. Aims. We merge the data sets from SOHO/MDI and SDO/HMI ...

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