Registration of Minute Changes in the Critical Frequency of the F2 Layer by the Ionosonde of Vertical Radio Sounding

The idea and the first results of experiments on the registration of the critical frequency of layer F2 in the Earth's ionosphere with an interval of one minute to determine the coefficient of minute unsteadiness of the ionosphere and its dependence on time are presented. The ionosonde used for the experiment, its main characteristics, advantages and disadvantages are described. The scientific and applied significance of the experiment is discussed.