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Schumann resonances: Interpretation of local diurnal intensity modulations
Author(s) -
Pechony O.,
Price C.
Publication year - 2006
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/2006rs003455
Subject(s) - local time , asymmetry , ionosphere , schumann resonances , modulation (music) , physics , intensity (physics) , function (biology) , computational physics , local field , lightning (connector) , optics , power (physics) , mathematics , geophysics , acoustics , quantum mechanics , statistics , biology , condensed matter physics , evolutionary biology
A technique suggested by Sentman and Fraser (1991) for separating the global and the local contributions to the observed Schumann resonance (SR) field power variations is applied to simulated SR field power calculated in a uniform cavity. The spatial/temporal distribution of lighting strokes included in the computations is based on satellite lightning data. It is shown that the local intensity modulation function calculated with a uniform model is similar to the function obtained by Sentman and Fraser with experimental data. Since the local modulation function computed from a uniform model simulation cannot be induced by ionosphere day‐night asymmetry, the local modulation function cannot represent diurnal ionosphere height variation. It is shown that the local modulation function depends primarily on the source‐receiver distance geometry and that Sentman and Fraser have developed an efficient technique of removing source‐receiver distance effects from SR records.