Excitation of electromagnetic fields during the arrival of acoustic pulses at the ionosphere

Geomagnetic-field disturbances connected with acoustic pulses arriving from the lower atmosphere are examined on the basis of a model of a plasma with a sharp boundary. The theoretical possibility of the generation of field disturbances and their propagation to a height of about 200 km in the course of several seconds are demonstrated. The disturbance amplitude amounts to 1 nTl for an acoustic pulse length of several kilometers and a relative excess pressure of about 0.1.