Research on Extremely Low Frequency Propagation With Particular Emphasis on Schumann Resonance and Related Phenomena. Part Ii. Location of Sources

Abstract

Administrative Information, • iii Table of Contents v Lint of Figures. , ix list of Symbols xii IV Cavity Fields From Vertical Electric Dipole Sources. 27 ^.1 The Earth-Ionosphere Cavity Model 27 4.2 Cavity Fields from Vertical Electric Dipole Sources 28 4.3 Fields from a Distribution of Independent Sources 31 <e»* if i i Chapter Page V The Ratio Method for Source Location 5^ 3.1 The Dominant Term Approximation 34 3.2 Ratios for Distributed Sources in the Lossy Cavity 39 5.3 Eifect of Ionosphere Model on Ratios ^3 VI Procedures for the Location of Sources by the Ratio Method 46 6.1 General Discussion of Source Distance Estimation 46 6.2 The Distance Estimation Procedure for Matching Two Ratios 49 6.

Atmospheric electricity

“…In the domain of the Schumann frequencies the possibility of monitoring the global lightning activh gained some momentum during the reporting period Polk [1969], , and Hughes {\9m discussed this item during the Tokyo conference Sir* then, especially during the March 7, 1970, solar eciip* new insight into frequency splitting has been obtained Also, it could be verified from ELF measurements tha> the contribution of the oceanic (Pacific) thunderstorm* occur mainly around local midnight, whereas other sources peak in the late local afternoon [Galejs, I9?f)i The cooperation of an ELF station near Kingston Rhode Island, with a station in southern German) continues. Location of thunderstorm centers with ex tremely low frequency, large changes in signal level m connection with solar proton events, the occurrence of ELF whistlers, and an indication of separation of the different influences by considering the power and resonant frequencies independently have been reported [Keefe and Polk, 1970], Toomey and Polk [1970],Polk [1969],and Keefe etal. [1968.…”