celerity 2 1 Chelyabinsk meteoroid 1 acoustic and atmospheric gravity waves 1 atmospheric pressure disturbances 1 diurnal and seasonal dependence 1 electric field 1 electron density 1 energy release 1 infrasonic signals 1 ionosonde 1 magnetic field 1 model fit 1 multiple explosions 1 near-Earth atmosphere 1 non-linear integral transform 1 regular and quasi-periodic disturbances 1 signal amplitude 1 signal duration 1 signal parameters 1 signal period 1 signal time delay 1 signal with peculiarities 1 spectral content 1 system spectral analysis 1 time-frequency analysis 1 volume charge 1 wave disturbances 1 waveform 1 Системный анализ 1