%0 Journal Article %A Nickolaenko, A. P. %D 2012 %I Begell House %K Earth-ionosphere cavity, global electric circuit, the Schumann resonance, ELF bursts, gamma burst %N 4 %P 365-377 %R 10.1615/TelecomRadEng.v71.i4.60 %T PARAMETRIC SOURCE OF ELF TRANSIENTS %U https://www.dl.begellhouse.com/journals/0632a9d54950b268,30d8cd9a506f8f4f,492850330b4f890e.html %V 71 %X We address changes in the global electric circuit, which were caused by arrival of the giant gamma flare from SGR 1806-20 to the dayside of the globe. It is shown that a parametric source of radio emission depends on the structure of the global electric circuit. We consider the formation of a discrete radio pulse in the framework of realistic exponential height profile of air resistance. We show that altitudes around the tropopause play a significant role in pulse formation. Spectral density radiated is inversely proportional to the frequency. Waveforms are computed of a parametric pulse caused by the gamma rays arrival. %8 2012-04-20