论文部分内容阅读
1.引言固体地球和水圈都是导电的,在深度400～600公里之间,电导率上升很陡,其值超过1s/m(西门子/米),600公里以下的地幔和地核,其导电性能更好。磁力仪台阵是利用磁层和电离层电流体系的磁场,其周期范围为1分钟到一天。在导电率σ的半空间,周期T场的趋肤深度d、由下式给出: d_s=30.2 (T/σ)~(1/2) (1)式中T=24小时,σ=1s/m时,d_s=148公里。所以,周期T≤24小时的场可以达到的深
1. INTRODUCTION Both solid earth and hydrosphere are conductive. At depths of 400-600 km, the conductivity rises steeply, with values exceeding 1s / m (Siemens / meter) and mantle below 600 km and core Conductive better. Magnetometer arrays utilize the magnetic field of the magnetosphere and ionospheric current systems and range from 1 minute to one day. In the half-space of the conductivity σ, the skin depth d of the period T field is given by: d_s = 30.2 (T / σ) ~ (1/2) where T = 24 hours and σ = 1s / m, d_s = 148 km. Therefore, the cycle T ≤ 24 hours of field can reach deep