Structure of the Near‐Surface Layers of the Sun: Asphericity and Time Variation | Zendy

Sarbani Basu | Zendy; H. M. Antia | Zendy; R. S. Bogart | Zendy

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Structure of the Near‐Surface Layers of the Sun: Asphericity and Time Variation

Author(s) -

Sarbani Basu,

H. M. Antia,

R. S. Bogart

Publication year - 2007

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/509251

Subject(s) - variation (astronomy) , asymmetry , physics , adiabatic process , degree (music) , helioseismology , geology , astrophysics , geodesy , magnetic field , acoustics , quantum mechanics , thermodynamics

We present results on the structure of the near-surface layers of the Sunobtained by inverting frequencies of high-degree solar modes from "ringdiagrams". We have results for eight epochs between June 1996 and October 2003.The frequencies for each epoch were obtained from ring diagrams constructedfrom MDI Dopplergrams spanning complete Carrington rotations. We find thatthere is a substantial latitudinal variation of both sound speed and theadiabatic index Gamma_1 in the outer 2% of the Sun. We find that both thesound-speed and Gamma_1 profiles change with changes in the level of solaractivity. In addition, we also study differences between the northern andsouthern hemispheres of the Sun and find a small asymmetry that appears toreflect the difference in magnetic activity between the two hemispheres.Comment: To appear in ApJ (January 2007

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