A STUDY OF HYDROMAGNETIC EMISSIONS
Abstract
Considerable geomagnetic micropulsation data were collected; however, attention is focused on the collection, reduction, analysis and interpretation of a single useful data sample obtained during a 4-day period, 18-21 November. To facilitate the interpretation of these data, consideration was given to observations in the same frequency range by other workers. The agreement between experiment and theory is consistent with the hypothesis that the signals of interest are generated above the ionosphere and are propagated downward through the ionosphere by hydromagnetic waves. Of particular interest is the long duration (up to 5 hours) of some hm emissions, and the simultaneous occurrence of many emissions in groups of the same slope (time rate of change of frequency). Consideration is given to the relationship between the occurrence of the signals and other geophysical effects observed during the unusual period of solar and geomagnetic activity. A positive correlation is established between the occurrence of the signals and polarcap absorption. Finally, a possible analogy is drawn between hm emissions and VLF emissions as observed by other workers, and a model is presented which may lead to understanding of generation of hm emissions. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 14, 1961
- Accession Number
- AD0260280
Entities
People
- Lee R. Tepley
Organizations
- Lockheed Martin Missiles and Space