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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. |