Assessment of global geomagnetic models from aeromagnetic data in Cameroon, Central Africa | ||
| NRIAG Journal of Astronomy and Geophysics | ||
| Volume 13, Issue 1, December 2024, Pages 61-74 PDF (6.19 M) | ||
| DOI: 10.1080/20909977.2024.2355791 | ||
| Author | ||
| Yohanna Kigbu Abimiku | ||
| Abstract | ||
| Global geomagnetic models are a compilation of existing magnetic data which were reprocessed and freely made available as 2 or 3 arc minute resolution grids at 0-km or 4–5-km altitude relative to the geoid. Thus, many researchers rely on those data due to their open access. This study aims at evaluating freely released global geomagnetic models with respect to aeromagnetic data which are the original data, usually subjected to third party or commercial restrictions in Cameroon. Hence, both global geomagnetic models and aeromagnetic data were sampled along 4 profiles for assessment. The extracted data were analysed using Pearson’s correlation coefficient depicted in tables. The Power Spectrum Density curves of both aeromagnetic and their respective global geomagnetic grids were computed and displayed as graphs. The results show that the so-claimed 4–5-km altitude relative to the geoid of global geomagnetic models is heterogeneous in Cameroon since the spectral content of those models vary from 5–20 km. Besides, considerable discrepancies were observed with Earth Magnetic Anomaly Grid version 3 (EMAG2v3) data, indicating that they are not reliable for scientific studies based in Cameroon. This study provides insights on global geomagnetic models and could aid in optimizing the use of those models in Cameroon. | ||
| Keywords | ||
| Global geomagnetic models; Aeromagnetic Data; power spectrum density; Pearson’s correlation coefficient; Cameroon | ||
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