Simplified model of ionosphere The dipole moment contributed by one electron Is p=-ex If the electrons can be considered free(Oo=0) then the dielectric constant becomes(with fo as fraction of free electrons 6()=E+i 4 rIFle mD(16-i0) 04/08/02 12.540Lec1604/08/02 12.540 Lec 16 9 Simplified model of ionosphere • The dipole moment contributed by one electron is p=-e x • If the electrons can be considered free ( ω 0=0) then the dielectric constant becomes (with f 0 as fraction of free electrons): ε( ω) = ε 0 + i 4 πNf 0 e 2 m ω(γ 0 − i ω)