Analysis of Several Years of DI Magnetometer Comparison Results by the Geomagnetic Network of China and IAGA

Abstract

The comparison of absolute geomagnetic instruments is an important component of geomagnetic observation. To promote high quality standards in geomagnetic data acquisition, the International Association of Geomagnetism and Aeronomy (IAGA) organizes an international comparison every two years. In China, this comparison is part of quality control process for geomagnetic observation data, and is organized by the Geomagnetic Network of China (GNC). In this paper, the comparison results from several years are analysed in detail, and some useful information is presented that will help to guide the observatory's future observation work and improve data quality. In addition, the quality of the absolute observation data of GNC and IAGA is evaluated using a statistical method. This should aid scientists who use these data to understand their research results.

Strategies in the Quality Assurance of Geomagnetic Observation Data in China

“…3. Periodic instrument calibration and maintenance; participation in the international instrument comparison organized by IAGA every two years to transfer the international standards of the instrument; completion of a comparison and grid value calibration of the absolute observation instrument in China's geomagnetic network once a year, unifying the national instrument standard (He 2019); completion of an accuracy calibration of the diurnal variation of the fluxgate magnetometer once a year (Zhang & Yang 2011). Through regular instrument calibration work, the accuracy of the equipment is ensured.…”