Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..869e&link_type=abstract
In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze
Physics
2
Helioseismology, Sub-Surface Flows, Atmospheric Magnetic Fields, Surface Term, P-Modes, F-Modes
Scientific paper
In helioseismology effects caused by the solar atmosphere on global eigenmodes are gathered in the so-called surface-term. Variations in chromospheric magnetic field, canopy height, temperature or the presence of equilibrium bulk motions all may cause observable frequency shifts of the solar p/f-modes. Surface random or sub-surface global motions (e.g. differential rotation, meridional flow motion) below the solar surface may also have measurable effects on the properties of helioseismic eigenmodes. When both an atmospheric magnetic field and sub-surface flows (i.e. steady state) are present, a complex picture of competition between these two effects is found. The theoretically predicted frequency shifts show promise of explaining some recent GONG, MDI and BiSON observations.
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