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Abstract:
We describe the set up of the magnetometer station Macapa, Brazil, close to the geographic and magnetic equator at 0.038S, 51.095W. The magnetometer was installed in November 2019 some 300 km northwest of the observatory Tatuoca to continue tracking the northward migrating equatorial electrojet. The station consists of a Geomag 02 magnetometer and and a GSM-90 recording magnetometer. By comparing the two instruments, it was found that the Geomag 02, as expected for a fluxgate magnetometer, shows some temperature dependency. We use the datasets of both instruments to determine the temperature coefficient of the north-pointing magnetic field channel of the Geomag 02. The temperature variations at the fluxgate sensor and electronics are recorded by the instrument. Interestingly, due to different temperature insolations, these parts experience different, but not independent, temperature variations. We present a method to deal with this situation for determining the temperature coefficient.
