Computer Science – Sound
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jatp...52..759l&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 52, Sept. 1990, p. 759-770. Research supported by Forsvare
Computer Science
Sound
5
Atmospheric Stratification, Ionospheric Propagation, Plasma-Electromagnetic Interaction, Signal Distortion, Wave Packets, E Region, Ionospheric Electron Density, Ionospheric Sounding, Radio Waves, Weighting Functions
Scientific paper
The paper concerns the propagation of pulses or wave packets through an ionospheric plasma. The rise time, which appears in the ionospheric weighting function, is shown to be a realistic measure of the magnitude of the pulse shape distortion and the shortest usable pulse length in single-path single-mode communication. The case of a horizontally stratified unmagnetized collisionless ionosphere is considered. Two such simple models, which describe the lower part of the layer and the region of the maximum of electron density, respectively, allow a completely analytic treatment yielding explicit expressions, in terms of the parameters of the profiles, for the rise time. The illustrations show that the rise time may be less than 1 microsec for a steep profile typical for sporadic E-layers, but in the range of one to a few tens of microsec for propagation through a normal layer.
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