  Electromagnetic sources, as e.g. lasers, antennas, diffusers or thermal
sources, produce a wavefield that interacts with objects to transfer them its
momentum. We show that the photonic force exerted on a small particle in the
near field of a planar statistically homogeneous fluctuating source uniquely
depends and acts along the coordinate perpendicular to its surface. The
gradient part of this force is contributed by only the evanescent components of
the emitted field, its sign being opposite to that of the real part of the
particle polarizability. The non-conservative force part is uniquely due to the
propagating components, being repulsive and constant. Also, the source
coherence length adds a degree of freedom since it largely affects these
forces. The excitation of plasmons in the source surface drastically enhances
the gradient force. Hence, partially coherent wavefields from fluctuating
sources constitute new concepts for particle manipulation at the subwavelength
scale
