We present results from the ionospheric heating experiment conducted at the High Frequency Active Auroral Research Program (HAARP) facility, Alaska. During the experiment, HAARP transmitted in the direction of the magnetic zenith X-mode 4.57-MHz wave. The transmitted power was modulated with the frequency of 0.9 mHz, and it was pointed on a 20-km spot at the altitude of 120 km. The heating (1) generates disturbances in the magnetic field detected...