Apparent and real fine structures in magnetospheric ULF or VLF emissions

Details Apparent and real fine structures in magnetospheric ULF or VLF emissions Apparent and real fine structures in magnetospheric ULF or VLF emissions

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.5839g&link_type=abstract

Journal of Geophysical Research, vol. 84, Oct. 1, 1979, p. 5839-5849.

Physics

Atmospheric Radiation, Earth Magnetosphere, Extremely Low Radio Frequencies, Fine Structure, Very Low Frequencies, Computerized Simulation, Monochromatic Radiation, Power Spectra, Radio Spectra

Scientific paper

A study of apparent and real fine structures in magnetospheric ULF or VLF emissions is presented. The analysis is applied to signals of type I consisting of two or more gliding tones closely spaced in time, and type II which consist of two or more quasi-monochromatic emissions of finite duration, slightly displaced in frequency and time. It is shown that when very narrow or very wide bandwidths are used, similar frequency-time patterns may be obtained with both signals. A procedure is suggested of analyzing the same signal with different filter bandwidths which makes possible distinguishing between the two signal types, and application is made to natural magnetospheric emissions recorded on the ground and on board satellites.

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