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We analyse the temporal evolution of the inclination component of themagnetic field vector for the penumbral area of 25 isolated sunspots. Comparedto previous works, the use of data from the HMI instrument aboard the SDOobservatory facilitates the study of very long time series ($\approx$1 week),compared to previous works, with a good spatial and temporal resolution. Weused the wavelet technique and we found some filamentary-shaped events withlarge wavelet power. Their distribution of periods is broad, ranging from thelower limit for this study of 48 minutes up to 63 hours. An interestingproperty of these events is that they do not appear homogeneously all aroundthe penumbra but they seem to concentrate at particular locations. Thecross-comparison of these wavelet maps with AIA data shows that the regionswhere these events appear are visually related to the coronal loops thatconnect the outer penumbra to one or more neighbouring opposite polarity fluxpatches.

Discovery of long-period magnetic field oscillations and motions in isolated sunspots