On the Accuracy Increase of Determining the Lower Ionosphere Parameters Using Amplitude Measurements of Partially Reflected Signals

摘要

Based on the experimental data and model calculations it is shown that the difference of experimental height dependences of the ratio of average (during the measurements of ～10 min) guadrates of amplitudes of the partially reflected signals of the extraordinary ("x") and ordinary ("o") polarizations a(z,t) from the theoretical ones at the heights of z > 80 km and z < 70 km (which is frequently observed in the experiments and results to additional, frequently essential, errors in determination of the lower ionosphere parameters) is possible becose of simultaneous influence of the following factors: radio noise, the incomplete separation of the "o" and "x" components by receiving equipment and their transformation in the magnetoactive ionosphere, due to difference in their impulse volumes of the "o" and "x" components in space, their differential absorption in the scattering volume, and also due to the essential nonmonotonous of the height electron density and electron-neutral molecule collision frequency profiles (the presence of sharp layers and valleys).