Solar p-mode excitation: further insight from recent low-l BiSON helioseismological data

Details Solar p-mode excitation: further insight from recent low-l BiSON helioseismological data Solar p-mode excitation: further insight from recent low-l BiSON helioseismological data

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.298l...7c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 298, Issue 1, pp. L7-L12.

Astronomy and Astrophysics

Astronomy

38

Convection, Sun: Atmosphere, Sun: Interior, Sun: Oscillations

Scientific paper

We present measurements of low-degree solar p-mode velocity powers, energies and energy supply rates between ~1600muHz and ~4700muHz, as derived from the analysis of several years of high-quality helioseismological data collected by the Birmingham Solar-Oscillations Network (BiSON). For the radial (l=0) modes, we find that the total energy E per mode (kinetic plus potential) peaks at ~3200muHz, reaching ~10^28erg. The rate at which energy is supplied to the modes E=2piDeltanu.E, where Deltanu is the FWHM modal line width, is observed to plateau between ~3000 and ~4000muHz, reaching a maximum of ~10^23ergs^-1. At frequencies below the plateau, the supply rate follows a simple power law with a dependence of E~nu^7.0+/-0.4 and at very-high frequencies the data follow E~nu^-4.5+/-1.1. These assume modal inertias normalized at T=T_eff with the mode-mass calculation normalized at the optical depth of the BiSON observations, the fitted power laws in E are approximately ~nu^6.5+/-1.1 and ~nu^-6.2+/-1.1 respectively.

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