US Migrating
type: Agent

National Geomagnetism Program
type: Distribution
access URL: http://geomag.usgs.gov
description: Monitoring of the Earth's magnetic field for research and practical applications.
issued: 2020-11-12T06:47:19.912733
modified: 2025-11-20T13:12:30.366392

Boulder Magnetic Observatory
type: Dataset
keyword: geomagnetic-indices
keyword: earth-science
keyword: national
keyword: magnetic-intensity
keyword: ckan
keyword: solid-earth
keyword: north-america
keyword: geoss
keyword: amerigeoss
keyword: magnetic-inclination
keyword: magnetic-field
keyword: united-states
keyword: magnetic-declination
keyword: geomagnetism
keyword: geo
keyword: amerigeo
description: These data are vector and scalar component values of the Earth's magnetic field for 2004 recorded at the Boulder Magnetic Observatory in Colorado. Vector values are measured using 3 mutually orthogonal fluxgate magnetometer sensors. The scalar value of the total magnetic field is recorded with a proton precession magnetometer. All values are calibrated with measurements of the absolute value of the geomagnetic field using a DI-Flux magnetometer. The data are numerically filtered to prevent aliasing, and quality controlled during processing. Longer period values of the field, including hourly, daily, monthly, and annual means are derived from the 1-minute data.
issued: 2025-11-20T13:12:30.375500
modified: 2025-11-20T13:12:30.375504
spatial: Location
  geometry: POINT (-105.2400 49.8600)