Accession Number : AD0603089

Title :   RELATIONS BETWEEN LIGHTNING DISCHARGES AND DIFFERENT TYPES OF MUSICAL ATMOSPHERICS,

Corporate Author : UPPSALA UNIV (SWEDEN)

Personal Author(s) : Norinder,Harald

Report Date : 23 NOV 1962

Pagination or Media Count : 29

Abstract : Recording cathode-ray oscillographs were used for the analysis of the lightning discharges whose relations to musical atmospherics were investigated. Cathode-ray oscillographic direction finders placed at two stations with suitable distances between them made it possible to determine the sources of the lightning discharges investigated. Through comparative harmonic analyses it was shown that lightning discharges producing musical atmospherics of the usual type - whistlers - were characterized by a preponderance of frequencies around 5-8 kc. Multiple lightning discharges were found to be followed by multiple whistlers. An investigation was made of correlations between lightning discharges and musical atmospherics of unusual and irregular variational forms. It was found that out of 700 unusual musical atmospherics about 70% were correlated to lightning discharges and about 30% were not. The striking variational resemblance between correlated and non-correlated short-time variational types of unusual musical atmospherics indicated that the non-correlated variational types must also emanate from lightning discharges. (Author)

Descriptors :   (*WHISTLERS, LIGHTNING), (*LIGHTNING, ATMOSPHERICS), (*ATMOSPHERICS, SOURCES), ELECTRIC DISCHARGES, FREQUENCY, THUNDERSTORMS, ELECTRIC FIELDS, OSCILLOGRAPHS, HARMONIC ANALYSIS, SWEDEN

Distribution Statement : APPROVED FOR PUBLIC RELEASE