Universal and local time variations deduced from simultaneous Schumann resonance records at three widely separated observatories
Article first published online: 15 SEP 2011
Copyright 2011 by the American Geophysical Union.
Volume 46, Issue 5, October 2011
How to Cite
2011), Universal and local time variations deduced from simultaneous Schumann resonance records at three widely separated observatories, Radio Sci., 46, RS5003, doi:10.1029/2011RS004663., , , , and (
- Issue published online: 15 SEP 2011
- Article first published online: 15 SEP 2011
- Manuscript Accepted: 13 JUN 2011
- Manuscript Revised: 27 MAY 2011
- Manuscript Received: 20 JAN 2011
- diurnal intensity variations;
- local time and universal time components;
- simultaneous records of Schumann resonance at three sites
 A technique is applied to experimental Schumann resonance intensity that separates the universal (UT) and local time (LT) variations. Two orthogonal horizontal magnetic field components were recorded simultaneously at the observatories of Moshiri, Japan (44.4°N, 142.2°E), Lehta, Russia (64.4°N, 34°E), and West Greenwich, Rhode Island, United States (41.6°N, 71.6°W). We use the cumulative magnetic field power integrated over the first three Schumann resonance modes. Diurnal variations were averaged over a month for the period from August 1999 to December 2001 at each site. These records were combined to obtain estimates for the UT daily patterns of the global thunderstorm activity. Diurnal variations of particular months repeat year after year, indicating that space-time distributions of global thunderstorms are annually replicated with minor deviations. Another technique, based on geometric averaging of records, was used to obtain alternative estimates of the global thunderstorm intensity. Results acquired with both techniques showed an outstanding similarity.