Noise
Adds random force to each individual particle.
It is simply a predefined 
Force node whose force and direction can be altered in the parameter editor. This tool is useful for animating insects swarming.
Using Noise
Click the
Noise button on the Drive Particles tab.Click
the 
particle system you want to be affected and press Enter to confirm your selection.Specify the node settings in the operation controls toolbar or parameter editor.
For specific parameter help see the Noise node help.