Читать книгу Introduction to the Physics and Techniques of Remote Sensing - Jakob J. van Zyl - Страница 20

The behavior of electromagnetic waves in free space is governed by Maxwell’s equations:

(2.1)

(2.2)

(2.3)

(2.4)

(2.5)

(2.6)

where

 E = electric vector

 D = displacement vector

 H = magnetic vector

 B = induction vector

 μ0, ∈0 = permeability and permittivity of vacuum

 μr, ∈r = relative permeability and permittivity

 ∇. = divergence

 ∇x = curl

Maxwell’s concept of electromagnetic waves is that a smooth wave motion exists in the magnetic and electric force fields. In any region where there is a temporal change of the electric field, a magnetic field appears automatically in that same region as a conjugal partner and vice‐versa. This is expressed by the above coupled equations.