SUB ELF GEOMAGNETIC FLUCTUATIONS. VOLUME I. FREQUENCY-TIME CHARACTERISTICS OF HYDROMAGNETIC EMISSIONS.
Abstract
Results are presented of recent measurements of hydromagnetic emissions at four Pacific Ocean stations widely separated in both latitude and longitude. The signals are almost always observed simultaneously at the four locations. The repetition frequency of the emission fine structure is found to be highly regular and is the same at all stations for any given hm emission event. The structural elements are observed simultaneously at stations in the same hemisphere, but the elements are found to be alternately spaced (180 out of phase) in emissions observed simultaneously at stations on opposite sides of the equator. Hence, energy is being received periodically and alternately in the northern and southern hemisphers. The result is applied to the evaluation of three recently proposed models for the generation of hm emissions; two of the three models are immmediately rejected. It is also observed on occasion that the fine-structure repetition-frequency ehibits the presence of a harmonic. The effect, referred to as 'structure-doubling; is tentatively interpreted as resulting from a super-position of signals from opposite hemispheres. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 26, 1963
- Accession Number
- AD0437332
Entities
People
- K. D. Amundsen
- Lee Tepley
- R. C. Wentworth
Organizations
- Lockheed Martin Missiles and Space