Electromagnetic resonance phenomena and equipments to study the relation between solar activity and the magnetoplasma (ionosphere)

Abstract

Abstract A more exact definition of the lower ionosphere is given. By the lower ionosphere we mean that part of the upper atmosphere between 50–60 km and 150 km where the phenomenon of ionic diffusion is small, and which influences the propagation of radio waves and atmospheric noises, and which is the seat of the system of currents that produce the variations of the geomagnetic field. The plasma exhibits a particular non-linear behaviour and has a layer (Bailey's layer) where considerable effects of electromagnetic resonance occur. After describing briefly the most recent work on the chemical, ionic and electric structure of the D region, the reason for the non-linear behaviour of the plasma in this region is explained. Using V. A. Bailey's theory of interaction and the Ginzburg-Gurevich kinetic theory the concept of the ‘plasma field’ is given and it is shown how the latter theory allows greater precision in calculating G eff and v eff and that among other things G eff depends on the temperature. To hav...