Mathematics
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jatp...57..479f&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 57, no. 5, p. 479-484
Mathematics
19
Earth-Ionosphere Waveguide, Electromagnetic Noise, Extremely Low Frequencies, Lightning, Magnetic Fields, Resonance, Whistlers, Analysis (Mathematics), Data Reduction, Power Spectra, Repetition, Variability
Scientific paper
The Institut fuer Geophysik Goettingen has facilities to record the time varying magnetic components H and D at extremely low frequencies (ELF) (0.1-20 Hz) continuously over several days, with a sampling rate of 100 Hz. The lower ELF-range is characterized by anthropogenic noise and the first two Schumann resonance modes of the Earth-ionosphere cavity. The local observations near Goettingen are disturbed by thunderstorms during the summer that contribute a small part of the energy to the global thunderstorm activity. Transient natural signals with amplitudes of about 10 pT are superimposed on a continuous noise level of about 1 pT; both exhibit the Schumann resonance periodicities. The signals show a tendency to repeat after about 2 s which may suggest excitation by whistler-trains. The Schumann resonances are investigated by an analysis of the autocovariance matrix yielding a robust estimation of the amplitude, damping and frequency. All these parameters show a characteristic directional dependence and variability during the day. The amplitudes represent the excitation with different source locations of thunderstorm activity around the world, generating a dipole field within the resonator, while the damping and centre-frequency are related to solar activity coupling to the lower ionosphere.
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