Relative importance of the day-night asymmetry in Schumann resonance amplitude records
Article first published online: 17 MAR 2007
Copyright 2007 by the American Geophysical Union.
Volume 42, Issue 2, April 2007
How to Cite
2007), Relative importance of the day-night asymmetry in Schumann resonance amplitude records, Radio Sci., 42, RS2S06, doi:10.1029/2006RS003456., , and (
- Issue published online: 17 MAR 2007
- Article first published online: 17 MAR 2007
- Manuscript Accepted: 8 FEB 2007
- Manuscript Revised: 26 JAN 2007
- Manuscript Received: 8 JAN 2006
- Schumann resonances;
- day-night asymmetry;
 Computations of Schumann resonance (SR) field amplitudes from a point source in the uniform and nonuniform cavities are performed to estimate the relative importance of the day-night asymmetry in observed SR amplitudes. Additional simulations with globally distributed sources, representing diurnal and seasonal variations of global lightning activity, are performed in uniform and nonuniform cavities to evaluate the impact of the day-night asymmetry on the diurnal and seasonal amplitude variations. The results show that the effect of diurnal ionosphere changes on the first mode SR amplitudes is ∼10%. Model results indicate that the source properties (the level of activity and proximity to the observer) play the dominant role in the diurnal variations observed in SR field records, with the day-night asymmetry being secondary in importance.