Context : Polar corona is often explored to find the energy source for the acceleration of the fast solar wind .
Earlier observations show omni-presence of quasi-periodic disturbances , traveling outward , which is believed to be caused by the ubiquitous presence of outward propagating waves .
These waves , mostly of compressional type , might provide the additional momentum and heat required for the fast solar wind acceleration .
It has been conjectured that these disturbances are not due to waves but high speed plasma outflows , which are difficult to distinguish using the current available techniques .

Aims : With the unprecedented high spatial and temporal resolution of AIA/SDO , we search for these quasi-periodic disturbances in both plume and interplume regions of the polar corona .
We investigate their nature of propagation and search for a plausible interpretation .
We also aim to study their multi-thermal nature by using three different coronal passbands of AIA .

Methods : We chose several clean plume and interplume structures and studied the time evolution of specific channels by making artificial slits along them .
Taking the average across the slits , space-time maps are constructed and then filtration techniques are applied to amplify the low-amplitude oscillations .
To suppress the effect of fainter jets , we chose wider slits than usual .

Results : In almost all the locations chosen , in both plume and interplume regions we find the presence of propagating quasi-periodic disturbances , of periodicities ranging from 10-30 min .
These are clearly seen in two channels and in a few cases out to very large distances ( \approx 250 ″ ) off-limb , almost to the edge of the AIA field of view .
The propagation speeds are in the range of 100-170 km s ^ { -1 } .
The average speeds are different for different passbands and higher in interplume regions .

Conclusions : Propagating disturbances are observed , even after removing the effects of jets and are insensitive to changes in slit width .
This indicates that a coherent mechanism is involved .
In addition , the observed propagation speed varies between the different passpands , implying that these quasi-periodic intensity disturbances are possibly due to magneto-acoustic waves .
The propagation speeds in interplume region are higher than in the plume region .