High-frequency and high-wavenumber solar oscillations

Antia, H. M. ; Basu, Sarbani (1999) High-frequency and high-wavenumber solar oscillations Astrophysical Journal, 519 (1). pp. 400-406. ISSN 0004-637X

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Official URL: http://iopscience.iop.org/0004-637X/519/1/400?from...

Related URL: http://dx.doi.org/10.1086/307364


We determine the frequencies of solar oscillations covering a wide range of degree (100 < l < 4000) and frequency (1.5 < ν < 10 mHz) using the ring diagram technique applied to power spectra obtained from Michelson Doppler Imager (MDI) data. The f-mode ridge extends up to l ≈ 3000, where the line width becomes very large, which implies a damping time that is comparable to the time period. The frequencies of high-degree f-modes are significantly different from those given by the simple dispersion relation ω2=gk. The f-mode peaks in power spectra are distinctly asymmetric, and use of an asymmetric profile increases the fitted frequency, bringing it closer to the frequencies computed for a solar model.

Item Type:Article
Source:Copyright of this article belongs to American Astronomical Society.
ID Code:12440
Deposited On:10 Nov 2010 06:34
Last Modified:16 May 2016 21:47

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