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We present a study of the impact of a ground-based, multi-station window function on estimates of the power and damping of low- solar p modes extracted from fits to resonant structure in the frequency domain. The window functions come from six-site observations made by the Birmingham Solar-Oscillations Network (BiSON) over the 10-yr period beginning 1991 January. Two strategies were adopted. In the first, we used an 800-d time series of continuous observations made by the GOLF instrument on board the ESA/NASA SOHO satellite. These data were modulated by a variety of BiSON window functions, with fractional duty cycles ranging from ∼0. 4t o∼0.8, and the resulting series analyzed. In the second we generated artificial 10-yr time series and studied the effect on these of the complete BiSON window.

On the measurement bias of low-$\ell$ solar $\vec{p}$-mode excitation parameters: The impact of a ground-based window function