Helioseismic measurements of solar radius changes from SOHO/MDI

Details Helioseismic measurements of solar radius changes from SOHO/MDI Helioseismic measurements of solar radius changes from SOHO/MDI

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sf2a.conf..551l&link_type=abstract

SF2A-2006: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: D. Barret, F. Casoli, G.

Astronomy and Astrophysics

Astrophysics

Scientific paper

The sub-surface of the Sun is much more complex than it does appear up to now. Analysing the SOHO/MDI (SOlar and Heliospheric Observatory/Michelson Doppler Imager) f-mode frequencies and their temporal variation for the last 9 years, we computed the variation of the radius in the subsurface layers of the Sun by applying helioseismic inversions. We have found a variability of the ``helioseismic'' radius in antiphase with the solar activity, with the strongest variations of the stratification being just below the surface around 0.995R&sun;. In addition, the radius of the deeper layers of the Sun, between 0.975R&sun; and 0.99R&sun; changes in phase with the 11-year cycle. These results imply a non-homogeneous variation of the radius with depth and time and may explain discrepancies in ground-based observations.

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