ANALISIS KUALITAS DATA VARIASI MAGNET BUMI MENGGUNAKAN METODE INTER-COMPARISON DI OBSERVATORIUM SERANG TAHUN 2024 Azril Maulana Gibran*
a) Department of Physics, Universitas Negeri Jakarta
Jalan Rawamangun Muka, Jakarta Timur 13220, Indonesia
azrilmln21[at]gmail.com
b) Geomagnetic Observatory, Meteorology, Climatology, and Geophysics Agency (BMKG)
Jalan Angkasa I No.2, Kemayoran, Jakarta 10720, Indonesia
Abstract
Indonesia, with its high geophysical activity, is vulnerable to changes in the Earth^s magnetic field that can affect technology and safety. Magnetic field data are now used not only to monitor geomagnetic variations but also as earthquake precursors and in oil and gas exploration. Therefore, data quality is crucial to ensure accurate data processing results. This Field Work Practice (PKL) was conducted at the Meteorology, Climatology, and Geophysics Agency (BMKG), the only official government institution managing geomagnetic observations in Indonesia, with a focus on analyzing the quality of geomagnetic variation data using the inter-comparison method at the Serang Observatory during 2024. This study evaluates the baseline stability of the Earth^s magnetic field components X, Y, Z, and H by comparing data from LEMI (IAGA) and GEA (IAGA_GEA) instruments. The analysis includes validating the completeness of daily data from both instruments, identifying potential mismatches or offsets, and examining data stability after instrument drift correction. The results are expected to provide insights into the consistency and reliability of data from the two types of sensors used at the Serang Observatory, ultimately supporting the accuracy of BMKG^s geomagnetic data for various applications, including disaster mitigation and geophysical research.
