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Mode parameters frequency (top), mode width (middle) and mode energy (bottom) show
a marked solar-cycle variation.
In the GONG analysis, the parameters are evaluated separately for
each (l,m,n) mode. This allows us to use the m-dependence
of the results to study latitudinal effects.
Here, the changes
for modes with 40 lte l lt 80 and 9 lte n lte 11 have been localized
in latitude using an Optimally Localized Averages technique.
The units are microhertz, microhertz, and 1030 erg, respectively.
The increased frequency, increased linewidth and decreased energy
of the modes correspond to the spatial distribution of magnetic flux.
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