Power Spectrum in the Conductive Terrestrial Ionosphere

• 作者: Georgi Jandieri Jaromir Pistora Nino Mchedlishvili
• 来源期刊: 地球与环境科学(英文)
• 学科: 地球科学
• 关键词: IONOSPHERE TURBULENCE IRREGULARITIES Plasma scattering
• 年，卷（期）: 2020,（1）
• 页码范围: 21-30
• 页数: 10页
• 分类号: P35

摘要

Stochastic differential equation of the phase fluctuations is derived for the collision conductive magnetized plasma in the polar ionosphere applying the complex geometrical optics approximation.Calculating second order statistical moments it was shown that the contribution of the longitudinal conductivity substantially exceeds both Pedersen and Hall’s conductivities.Experimentally observing the broadening of the spatial power spectrum of scattered electromagnetic waves which equivalent to the brightness is analyzed for the elongated ionospheric irregularities.It was shown that the broadening of the spectrum and shift of its maximum in the plane of the location of an external magnetic field(main plane)less than in perpendicular plane for plasmonic structures having linear scale tenth of kilometer;and substantially depends on the penetration angle of an incident wave in the conductive collision turbulent magnetized ionospheric plasma.The angle-of-arrival(AOA)in the main plane has the asymmetric Gaussian form while in the perpendicular plane increases at small anisotropy factors and then tends to the saturation for the power-low spectrum characterizing electron density fluctuations.Longitudinal conductivity fluctuations increase the AOAs of scattered radiation than in magnetized plasma with permittivity fluctuations.Broadening of the temporal spectrum containing the drift velocity of elongated ionospheric irregularities in the polar ionosphere allows to solve the reverse problem restoring experimentally measured velocity of the plasma streams and characteristic linear scales of anisotropic irregularities in the terrestrial ionosphere.