IONOSPHERIC PERTURBATIONS AND SCHUMANN RESONANCE DATA.
MASSACHUSETTS INST OF TECH CAMBRIDGE GEOPHYSICS LAB
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The properties of the first Schumann resonance mode are examined experimentally and theoretically to determine the influence of ionospheric disturbance events upon the electromagnetic earth-ionosphere cavity. On the experimental side, a phase-sensitive tracking system has been constructed to monitor the first mode peak frequency and Q on a continual basis. The tracking system monitored signals from a vertical antenna in eastern Massachusetts for five months during 1966-1967. On the theoretical side, a study of the inverse problem was made. The results show that the short term resonance variations can be used to locate ionospheric perturbations. The transmission surface representation of the earth-ionosphere cavity is solved using a Greens function technique to obtain the cavity response to perturbed ionospheric models. An iterative procedure solves the matrix problem which relates frequency changes to changes in ionospheric parameters, showing the geographic distribution of ionospheric perturbations. Author
- Atmospheric Physics
- Radiofrequency Wave Propagation