Boulder Geomagnetic Observatory
Boulder Geomagnetic Observatory (BOU) is a geomagnetic observation facility operated by the United States Geological Survey (USGS). It is located near Boulder, Colorado at . The site was established in 1961.

Customers of the observatory include the Space Weather Prediction Center (SWPC) and the Air Force Weather Agency (AFWA).

Instruments
 A magnetometer
 A solar proton sensor

See also
 Space weather
 Heliophysics
 K-index

External links
 Boulder (BOU) Geomagnetic Observatory website
 Boulder USGS Magnetometer Monitor

Geophysical observatories
Space weather