Characterization of the Effects of Temperature and Instrument Drift in Long-Term Comparative Geomagnetic Vector Observations

Abstract

In order to minimize interruptions to recording, geomagnetic observatories usually use a back-up instrument operating simultaneously with the primary instrument in order to obtain comparative observations. Based on the correction parameter calculation method established in the previous work, we focused on the effects of temperature and instrument drift on the comparative geomagnetic vector observations. The linear influence of temperature on the comparative data was shown to be variable. The relative temperature coefficient changed around the temperature inflection point and showed a V-type distribution in a scatter plot. This conclusion was verified in laboratory experiments. The long-term time drift between the comparative instruments exhibits a linear pattern, and the fitness of the correction model can be evaluated by the degree to which the residual distribution of the fitted straight line conforms to the normal distribution. However, the absolute value of the long-term time drift between variometers with the same type of probe is very small. Therefore, long-term time drift correction should be carried out with care. The associated analysis and conclusions have the potential to benefit data agreement correction of long-term comparative geomagnetic vector observations and comparative testing of the performance of vector instruments.

Improving the environmental temperature adaptability of an electric temperature measurement subsystem by matching temperature coefficients of substitutable resistors

“…The temperature coefficient, defined as the extent to which environmental temperature affects an electrical component, has presented a persistent challenge, despite manufacturers' efforts to minimize it. Non-zero temperature coefficients can interfere with measurements, particularly during longterm measurements, where temperature drift can impair lowfrequency performance [12][13][14][15][16]. Although temperature control can reduce these effects, it is often complex [17][18][19][20].…”

Lithosphere–Atmosphere–Ionosphere Coupling Processes for Pre-, Co-, and Post-Earthquakes

“…In a monitoring system, the instrument plays an important role, as its accuracy and resolution greatly affect its ability and reliability in distinguishing anomalies. He et al [19] analyzed the effects of temperature and instrument drift between comparative instruments for geomagnetic field observation. The linear influence of temperature on the comparative data was shown and the relative temperature coefficient changed around the temperature inflection point with a V-type distribution, which was consistent with the laboratory experiments.…”