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Accurate Mapping of the Torsional Oscillations: a Trade-Off Study between Time Resolution and Mode Characterization Precision | |
Auteur | Korzennik Sylvain |
Institution | Harvard-Smithsonian Center for Astrophysics |
Theme | Convection, dynamo and flows |
| Auteur(s) supplémentaire(s) | Eff-Darwich, Antonio |
| Institution(s) supplémentaire(s) | Instituto de Astrofisica de Canarias, Tenerife, Spain |
Abstract | One salient result of global helioseismology is the mapping of the so-called torsional oscillations below the solar surface. These subsurface flows are inferred by inverting rotational frequency splitting sets of global modes. These flows extent down to a depth of at least 0.8 R, and are likely associated with the activity cycle of our star. To better understand the mechanisms that drive the solar cycle we need to accurately map these flows, and characterize precisely their penetration depth and their temporal behavior. We present a detailed study of the spatio-temporal variation of the solar rotation rate associated with the torsional oscillation based on state-of-the-art mode fitting of time series of various lengths of MDI observations. The times-series analyzed cover a full solar cycle, or 4608 days. That epoch was fitted using various length overlapping segments. Such approach allows us to better estimate how much significant information can be extracted from the different time spans and hence trade-off time resolution for precision in the inverted profiles resulting from the different mode sets. |