Large Scale Velocity Features of the Solar Surface

Details Large Scale Velocity Features of the Solar Surface Large Scale Velocity Features of the Solar Surface

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh33b0411l&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH33B-0411

Astronomy and Astrophysics

Astronomy

7529 Photosphere, 7536 Solar Activity Cycle (2162), 7539 Stellar Astronomy

Scientific paper

While it is widely known the sun's convection zone rotates differentially, we are now beginning to understand the complex velocity patterns that flow on, and below, the solar surface. Torsional oscillations, meridional flows and giant cells are examples of these large-scale velocity features. Our research aims to further the understanding of these large-scale features and gain more insight into the turbulent region above the solar tachocline. We use use dopplergrams from the MDI instrument on the SOHO spacecraft; these are stacked into data cubes of non-integer solar rotations. The data cubes are processed to track each region as it crosses the solar disk, to remove transient Doppler velocity signals, such as supergranulation, producing velocity maps long-lifetime features. These velocity maps show large-scale velocity trends and patterns of flows persisting over a solar cycle. These maps may be used to determine if giant cells are large-scale wave patterns or are convection cells.

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