Physics
Scientific paper
Nov 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jatp...38.1201c&link_type=abstract
(International Union of Radio Science and International Association of Geomagnetism and Aeronomy, Symposium on the Physics of th
Physics
2
Atmospherics, Extremely Low Frequencies, Magnetic Measurement, Magnetospheric Instability, Ogo-5, Satellite-Borne Instruments, Dawn Chorus, Magnetic Field Configurations, Magnetometers, Noise Generators, Spectrum Analysis, Tropical Regions, White Noise
Scientific paper
Individual ELF chorus elements are analyzed in detail using OGO 5 search coil magnetometer data. The chorus studied was detected in the equatorial region at L of about 6-7 on the nightside. The evolution of frequency, amplitude, and wave normal direction is studied inside the elements. Isolated rising tones, a period of change from rising to falling tones, and a period of burstlike structure are analyzed. There is nearly always a time structure but no fine structure in frequency. The amplitude variations are very quick. The wave normal direction may turn inside an element. Falling tones seem to present higher values of wave-vector angle than rising ones. The results are preliminary.
Burton R. K.
Cornilleau-Wehrlin Nicole
Etcheto Jacqueline
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