Accession Number : AD0656761

Title :   IONOSPHERIC PERTURBATIONS AND SCHUMANN RESONANCE DATA.

Descriptive Note : Doctoral thesis,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE GEOPHYSICS LAB

Personal Author(s) : Nelson,Philip H.

Report Date : MAY 1967

Pagination or Media Count : 123

Abstract : 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 Green's 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)

Descriptors :   (*IONOSPHERIC DISTURBANCES, ELECTROMAGNETIC RADIATION), THESES, MAGNETIC STORMS, DIURNAL VARIATIONS, THUNDERSTORMS, LIGHTNING, ELECTRON DENSITY, ATMOSPHERE MODELS, TRACKING, RESONANCE

Subject Categories : Atmospheric Physics
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE