Theoretical model of the electromagnetic disturbances caused by explosions in the ionosphere

A new analytical solution of the snowplow model of explosion in the rarefied gas has been obtained. This solution has been compared with Stuart´s and Holway´s numerical models and with experimental data obtained by the SPOLOH experiment. The comparison shows the solution corresponds to these models with good accuracy and allows calculating the main hydrodynamic characteristics. These characteristics were used for evaluating of the electric current and the electromagnetic field occurring by explosion in the ionosphere. Our calculations show the electromagnetic disturbance propagates mainly along magnetic field. Such result agrees with the data obtained by experiments TOR, Trigger and Ariel. Presented model allows calculating electromagnetic and hydrodynamic disturbances caused by active impacts and rocket engines disasters.