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

We present measurements of low-degree solar p-mode velocity powers, energies and energy supply rates between ∼ 1600 μHz and ∼ 4700 μ Hz, 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 ∼ 3200 μ Hz, reaching ≈ 1028 erg. The rate at which energy is supplied to the modes E=2 π Δν .E, where Δ ν is the FWHM modal line width, is observed to plateau between ∼ 3000 and ∼ 4000 μ Hz, reaching a maximum of ≈ 1023 erg s−1. At frequencies below the plateau, the supply rate follows a simple power law with a dependence of E ∝ ν 7.0 ± 0.4; and at very-high frequencies the data follow E ∝ ν−4.5 ± 1.1. These assume modal inertias normalized at T=Teff; with the mode–mass calculation normalized at the optical depth of the BiSON observations, the fitted power laws in E are approximately ∼ ν 6.5 ± 1.1 and ∼ ν −6.2 ± 1.1 respectively.

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