基于LAIC电场渗透和SAMI2模拟的地震-电离层扰动现象研究

Seismo-ionospheric Disturbance Based on LAIC Electric Field Penetration and SAMI2 Simulation

地震会造成电离层电子密度扰动。基于三维电场渗透模型和SAMI2模型,模拟地震发生前产生的异常电场对电离层电子密度的影响。模拟结果表明,地震前形成的附加电流会引起电离层产生异常电场,且异常电场值与地震震级和地震发生时间有着明显的相关。同时异常电场会使电子产生E×B漂移,造成电子密度扰动。随着时间的推移,电子密度扰动逐渐减小且扰动区域会向着靠近磁赤道方向或远离磁赤道方向漂移。

We explored the influence of the electric field generated by the earthquake on the electron density in the ionosphere based on the three-dimensional electric field penetration model and SAMI2 model. Simulation results show that additional currents formed before an earthquake can cause abnormal electric field in the ionosphere, and its value is significantly related to the earthquake magnitude and the occurrence time of the earthquake. Moreover, the electric field will cause the disturbance of the electron density by E × B drift. As time goes by, the electron density perturbation decreases and the perturbed region is shifted toward the direction of the magnetic equator or far away from the magnetic equator.