Temporal Variations in l=0 Peak Parameters
1728 days of data, starting on 1995 September 28 and ending on
2000 June 20, from the GONG l=0 time series, were anaylzed along
with the contemporaneous '0-dimensional' data from the BiSON network.
More details on this work were presented at the SOHO12/GONG+2002 meeting in October 2002, and will be published by
Howe et al. (2003).
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Peak parameter shifts were found by identifying modes that were
successfully fitted in all the 144-day time periods,
then comparing the values at each epoch with the temporal mean and
averaging over the available modes.
Frequency shifts (left) are shown for GONG (red) and BiSON (green) and show an increasing trend with the rising solar cycle.
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The mode height (right) shows a decreasing trend, modulated to some extent by the duty cycle of the observations.
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The mode width (left) shows an increasing trend for both projects, though this is almost swamped by duty-cycle and other effects. These trends are consistent with earlier results.
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