The structure of the near-surface layers of the Sun: asphericity and time variation

Details The structure of the near-surface layers of the Sun: asphericity and time variation The structure of the near-surface layers of the Sun: asphericity and time variation

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsp11b..10b&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SP11B-10

Computer Science

Sound

7522 Helioseismology, 7536 Solar Activity Cycle (2162), 7544 Stellar Interiors And Dynamo Theory

Scientific paper

We present results on the structure of the near-surface layers of the Sun. These results were obtained by inverting frequencies of high-degree solar modes obtained by using "ring diagrams". We have results for seven epochs from June 1996 to March 2002. The frequencies of each epoch were obtained from ring diagrams constructed from MDI Dopplergrams spanning one complete Carrington rotation. We find that there is a substantial latitudinal variation of both sound speed and the adiabatic index Γ1 in the outer 2% of the Sun. In addition, it appears that both the sound-speed and Γ1 profiles change with change in the level of solar activity.

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