The Theory Research On Ocean Induction Electromagnetic Field

The main reaearch results are obtained in this papwe as follows:(1)A physics model is established for induction electromagnetic field for ocean current movement in the geomagnetic field.The formula of surface current density is deduced.Furthermore,the regularity and characteristics are obtained for ocean current movement in the geomagnetic field.A general formula is deduced for electric field and magnetic field for different oceanwater conductivity.The time-space characteristics of the electromagnetic field are analysied under different conditions.(2)According to some ocean current data about the South Chian Sea and the Luzon Strait and the ocean current data collected by XCP,the electric field is first calculated for some places.And then,the conductivity of the seawater is calculated based on the relationship of the temperation and the depth.The magnetic field is obtained based on the electric field and conductivity.(3)The electric field generated by ocean current movement in the geomagenetic field is relative with its velocity,direction as well as the intensity and its gradient of the geomagnetic field in this location.The induction electromagentic field exists in everywhere in theory,and it has a maxmum value in surface and marebase.General speaking,magnetic field in inner is lower than surface and marebase.In some case,the velocity of the ocean current is a few cm/s to 100cm/s.This value can be detected by the device.The intensity of the magnetic field is from 0.1 to several ten nT,Intensity of the electric field is from a few to ten thousands of nV/m.(4)Ocean current has a diffent velocity at different depth.The electromagnetic field generated by ocean current in the geomagnetic field is mainly determined by the velocity,thickness of ocean current.Vertical value of the induction electric field is determined by the seawater velocity and horizontal value.Two horizontal values of the induction electric field is proportion to the vertical value of the geomagnetic field.Each electric field components is vertical to the direction of the oceanwater.The value of the induction magnetic field in the oceanwaer is about tens of nT.Its dirction is parelled to the ocean surface.(5)The electric field,induction magenetic intensity and the induction electromagnetic field are duduced for simple harmonic motion oceanwater.Analysis and comparison of the induction electricmagnetic field with the electromagnetic field generated by the oceanwater cut geomagnetic lines of flux is carried out.