Characteristics of full-disc BiSON power spectra above the acoustic cut-off frequency of the solar atmosphere

Physics

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Sun: Activity, Sun: Oscillations

Scientific paper

We have analyzed 60 months of non-imaged Doppler velocity observations of the visible disc of the Sun in an effort to search for pseudo-mode-like structure in the data above the acoustic cut-off frequency of the solar atmosphere (≍5400 μHz). These data were collected by the ground-based Birmingham Solar-Oscillations Network (BiSON). Our analysis uncovers marginally significant evidence for the presence of a pseudo-mode-like structure in the range 5900 <= ν <= 6600 μHz, with a spacing between adjacent peaks (or troughs) of ~70 μHz. The signature - which, owing to the low signal to noise, disappears at higher frequencies - has a similar repeat period and phase to that found by Garcia et al. (1998) in full-disc GOLF data. However, the zero-to-peak power is a factor of ~10 weaker in strength.

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