CAJ | 학술논문

电离层-空气层-地球介质(我们称为"地-电离层"模式)耦合下大功率可控源电磁波的研究在国内外较少.近年来,有学者做了相关的数值模拟,但没有考虑空气中位移电流的影响.我们根据研究对象和问题建立地质模型和相应的数学模型,采用R函数法进行"地-电离层"模式水平电缆接地偶极源的电磁波场强公式推导,同时考虑电离层和空气中位移电流的影响.在验证方法可靠的前提下,进行了数值计算.探讨了"地-电离层"模式大功率可控源电磁波的响应特征.数值计算结果表明,由于电离层和卒气层中位移电流的影响,"地-电离层"模式大功率可控源电磁波的特征与地球半空间可控源电磁波的特征有很大的不同,体现在前者除了有近场、远场外,还存在由于电离层影响下场强衰减变小的波导场.并随着收发距增大和频率的增高,出现了电场和磁场方向图的变化.
전리층-공기층-지구개질(아문칭위"지-전리층"모식)우합하대공솔가공원전자파적연구재국내외교소.근년래,유학자주료상관적수치모의,단몰유고필공기중위이전류적영향.아문근거연구대상화문제건입지질모형화상응적수학모형,채용R함수법진행"지-전리층"모식수평전람접지우겁원적전자파장강공식추도,동시고필전리층화공기중위이전류적영향.재험증방법가고적전제하,진행료수치계산.탐토료"지-전리층"모식대공솔가공원전자파적향응특정.수치계산결과표명,유우전리층화졸기층중위이전류적영향,"지-전리층"모식대공솔가공원전자파적특정여지구반공간가공원전자파적특정유흔대적불동,체현재전자제료유근장、원장외,환존재유우전리층영향하장강쇠감변소적파도장.병수착수발거증대화빈솔적증고,출현료전장화자장방향도적변화.
There are only a few number of publications relate to the electromagnetic fields which including the responds of ionosphere, air and earth (called the " earth-ionosphere" mode). Recently, some geophysics simulated this similar mode, but the effects of ionosphere and displacement current in the air are not taken into account. In this study, we establish the geology model based on the "earth-ionosphere" mode. And we apply R function method to obtain the electromagnetic fields equations for horizontal electric bipole, at the same time, the effects of ionosphere and displacement current in the air are considered. We simulate the electromagnetic fields and discuss their characters after verified the method. The results indicate that the "earth-ionosphere" mode EM fields have an extra wave-guide zone due to the influence of the ionosphere and displacement current in the air, the wave-guide field become large with the space of transmitter-receivers increasing, and the field behavior in the wave-guide zone is very different from the far field zone.