Wednesday, October 8, 2025

Solar cycle variation of oscillation frequencies

The figure shows the temporal variation of the oscillation frequencies incorporating the latest data set (GONG month 306) as well as solar activity represented by 10.7 cm radio flux.  The frequency shifts are calculated from 36 days time series.  The light blue and orange curves are smoothed over a 1 year period.   The correlation between the frequency shifts and solar activity is very high.   

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GONG data processing update

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