  In this paper, we study the periodic fluctuations of connectivity density
time series of a wind speed-monitoring network in Switzerland. By using the
correlogram-based robust periodogram annual periodic oscillations were found in
the correlation-based network. The intensity of such annual periodic
oscillations is larger for lower correlation thresholds and smaller for higher.
The annual periodicity in the connectivity density seems reasonably consistent
with the seasonal meteo-climatic cycle.
