Abstract
Several solar oscillation time series exist now which are of enough quality and duration for making possible an investigation of possible long term variations of p-mode frequencies. The intrinsic accuracy on the determination of an individual frequency is estimated by means of the best available p-mode lifetime measurements. A statistical estimation of the accessible amplitude of long term frequency drifts is deduced. With an optimum integration time of the order of 6 months, it is shown to be as small as 0.03 μ Hz. A critical review of results published to-date in this investigation is then presented and discussed.
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