Line Asymmetry of Solarp‐Modes: Properties of Acoustic Sources | Zendy

Pawan Kumar | Zendy; Sarbani Basu | Zendy

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Line Asymmetry of Solarp‐Modes: Properties of Acoustic Sources

Author(s) -

Pawan Kumar,

Sarbani Basu

Publication year - 1999

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 - 10.1086/307369

Subject(s) - spectral line , multipole expansion , asymmetry , physics , quadrupole , computational physics , line (geometry) , range (aeronautics) , dipole , excitation , atomic physics , materials science , geometry , mathematics , astronomy , quantum mechanics , composite material

The observed solar p-mode velocity power spectra are compared withtheoretically calculated power spectra over a range of mode degree andfrequency. The shape of the theoretical power spectra depends on the depth ofacoustic sources responsible for the excitation of p-modes, and also on themultipole nature of the source. We vary the source depth to obtain the best fitto the observed spectra. We find that quadrupole acoustic sources provide agood fit to the observed spectra provided that the sources are located between700 km and 1050 km below the top of the convection zone. The dipole sourcesgive a good fit for significantly shallower source, with a source-depth ofbetween 120 km and 350 km. The main uncertainty in the determination of deptharises due to poor knowledge of nature of power leakages from modes withadjacent degrees, and the background in the observed spectra.Comment: Extensively revised. To appear in Ap

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