Low-frequency noises at outer ionosphere altitudes and solar activity

I investigated the results of registering the low-frequency electromagnetic radiation intensity at altitudes of the outer ionosphere from satellite data at various levels of solar activity. I revealed that the low-frequency radiation intensity depended on solar activity, i.e., spatial characteristics of noise variation. In the paper there are mean values of noise amplitude variations at different phases of a solar activity cycle. I show that low-frequency radiations are an information source on the processes progressing in the surface plasma, in particular, one may judge of radiation belts state by them. Noise carries the information on variations of the particle fluxes breaking into the Earth plasmasphere in different conditions of solar activity and on the variations of the magnetospheric plasma related to solar activity growth. In other words, electromagnetic low-frequency noise can be a peculiar indicator of the solar activity and the state of the magnetosphere.