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Spatial Scales and Time Variation of Solar Subsurface Convectionстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Getling A.V., Kosovichev A.G.
- Журнал: Astrophysical Journal
- Том: 937
- Номер: 1
- Год издания: 2022
- Издательство: University of Chicago Press
- Местоположение издательства: United States
- Номер статьи: 41
- DOI: 10.3847/1538-4357/ac8870
- Аннотация: Spectral analysis of the spatial structure of solar subphotospheric convection is carried out for subsurface flowmaps constructed using the time–distance helioseismological technique. The source data are obtained from theHelioseismic and Magnetic Imager on board the Solar Dynamics Observatory from 2010 May to 2020 September.A spherical harmonic transform is applied to the horizontal velocity divergence field at depths from 0 to 19 Mm.The range of flow scales is fairly broad in the shallow layers and narrows as the depth increases. The horizontalflow scales increase rapidly with depth, from supergranulation to giant-cell values, and indicate the existence oflarge-scale convective motions in the near-surface shear layer. The results can naturally be interpreted in terms of asuperposition of differently scaled flows localized at different depth intervals. There is some tendency toward theemergence of meridionally elongated (banana-shaped) convection structures in the deep layers. The total power ofthe convective flows is anticorrelated with the sunspot number variation over the solar activity cycle in shallowsubsurface layers, and positively correlated at larger depths, which is suggestive of the depth redistribution of theconvective flow energy due to the action of magnetic fields.
- Добавил в систему: Гетлинг Александр Владимирович