This data release consists of Magnetic Repeat Station data collected at three different sites in the central United States. One site is in Fremont, NE, the other two are in Hereford and Del Rio, TX. Repeat Stations are temporary magnetic installations, where the Earth's magnetic field, or geomagnetic field, is measured for several days, with the goal of producing mean values of the vector components of the field, when the geomagnetic field is in a quiescent state. The data consist of approximately 72 hours of the vector magnetic field variations at each site plus calibration data measured periodically during the collection of the time series data. The time series data were digitally recorded using a 3-axis Narod fluxgate magnetometer and GEM GSM-19 overhauser magnetometer. The data were stored in files that could be used in a spreadsheet. The calibration data needed to derive absolute data were recorded manually using a Declination-Inclination magnetometer. Absolute and baseline values were computed using spreadsheets.
