Source models for “parametric” Q-burst

Changes are modeled of parameters of the global electric circuit caused by the giant gamma ray burst arrived at the Earth’s dayside on December 27 2004. Modification of the air conductivity by gamma rays alters the leakage current of the Earth–ionosphere cavity and causes a discrete radio pulse. Electric parameters of the air at the tropopause–troposphere altitudes play the key role. ELF spectrum of the “parametric” current moment is ‘red’ or ‘white’ depending on the particular model. Sample spectra and waveforms are presented of the parametric Q–burst.