磁偶极子构造法铁磁性物体干扰地磁观测正演

doi:10.12196/j.issn.1000-3274.2023.02.012

Abstract

Abstract: Ferromagnetic object is one of the common disturbance sources in geomagnetic observation, and it is of great significance to select a suitable calculation and analysis method for its accurate forward magnetic field. In order to quickly solve the amplitude and planar distribution of the interference generated by ferromagnetic objects, a numerical calculation method based on the principle of magnetic dipole structure is proposed to solve the magnetic field of ferromagnetic objects, in which the object is divided into volume units, with each unit regarded as a “magnetic dipole” . The magnetic field distribution characteristics of ferromagnetic objects in three-dimensional space are calculated by using the method of magnetic field superposition. The results show that the interference range of ferromagnetic objects on the geomagnetic total field is proportional to the intensity, volume and susceptibility of the background magnetic field, and is related to its shape. The three-dimensional distribution of the interference on the total field intensity F, horizontal component H, vertical component Z and declination D is related to the direction of the background geomagnetic field.

Key words: Ferromagnetic object, Geomagnetic observation, Magnetic dipole, Spatial distribution

CLC Number:

P318.6

GUO Yu-xin, ZHANG Qian, ZHANG Xiu-xia, GAO Xi-wei, LI Yu. Magnetic Dipole Reconstruction Method for Forward Modeling of Ferromagnetic Object Interference on Geomagnetic Observation[J]. EARTHQUAKE, 2023, 43(2): 145-155.

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Magnetic Dipole Reconstruction Method for Forward Modeling of Ferromagnetic Object Interference on Geomagnetic Observation

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