摘要
Usually, it was considered that for the upper atmosphere over the whole globe there are two typical nighttime ionospheric thick-layers in the height of ionospheric E-region. One of them is called nighttime E-layer which is at altitude of about 110 km. It appears every night and has a weaker ionization of the geocorona resonance scattering; the other is called 'intermediate' layer which is at an altitude of about
