Simultaneous observations of Schumann resonances in California and Australia - Evidence for intensity modulation by the local height of the D region

Details Simultaneous observations of Schumann resonances in California and Australia - Evidence for intensity modulation by the local height of the D region Simultaneous observations of Schumann resonances in California and Australia - Evidence for intensity modulation by the local height of the D region

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9615973s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Sept. 1, 1991, p. 15,973-15,983. Research supported by Australian Res

Physics

45

D Region, Geomagnetism, Lightning, Thunderstorms, Australia, California, Diurnal Variations, Extremely Low Frequencies, Plasma Resonance, Power Spectra

Scientific paper

Results are presented of simultaneous observations of the intensities of Schumann resonances (SRs) made in California and western Australia during separate intervals in September 1989 and April 1990. For both periods, diurnal variations of the average magnetic power over the three modes of the SRs showed substantially different temporal profiles at the California and western Australia stations, with interstation correlations of 0.51 and 0.39, respectively. A method is demonstrated for determining from these observations the average local time variation of the D region height. A height variation is obtained that is nearly identical for the respective analysis periods, with a minimum height occurring at approximately 1300-1400 LT and a maximum-to-minimum height difference of roughly 50 percent of the mean. The substantial agreement between the two stations after correction for D region height suggests that such observations could be used to monitor the global totality and variability of lightning in studies of global change.

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