  Earth can act as a transducer to convert ultralight bosonic dark matter
(axions and hidden photons) into an oscillating magnetic field with a
characteristic pattern across its surface. Here we describe the first results
of a dedicated experiment, the Search for Non-Interacting Particles
Experimental Hunt (SNIPE Hunt), that aims to detect such dark-matter-induced
magnetic-field patterns by performing correlated measurements with a network of
magnetometers in relatively quiet magnetic environments (in the wilderness far
from human-generated magnetic noise). Our experiment constrains parameter space
describing hidden-photon and axion dark matter with Compton frequencies in the
0.5-5.0 Hz range. Limits on the kinetic-mixing parameter for hidden-photon dark
matter represent the best experimental bounds to date in this frequency range.
