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We examine the frequency shifts in low-degree helioseismic modes from theBirmingham Solar-Oscillations Network (BiSON) covering the period from 1985 -2016, and compare them with a number of global activity proxies well as alatitudinally-resolved magnetic index. As well as looking at frequency shiftsin different frequency bands, we look at a parametrization of the shift as acubic function of frequency. While the shifts in the medium- and highfrequencybands are very well correlated with all of the activity indices (with the bestcorrelation being with the 10.7 cm radio flux), we confirm earlier findingsthat there appears to have been a change in the frequency response to activityduring solar cycle 23, and the low frequency shifts are less correlated withactivity in the last two cycles than they were in Cycle 22. At the same time,the more recent cycles show a slight increase in their sensitivity to activitylevels at medium and higher frequencies, perhaps because a greater proportionof activity is composed of weaker or more ephemeral regions. This lends weightto the speculation that a fundamental change in the nature of the solar dynamomay be in progress.

The Sun in transition? Persistence of near-surface structural changes through Cycle 24