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Title: hf Communication Problems at Low Latitudes due to Steep Spatial & Temporal Electron Density Gradients
Authors: Lakshmi, D R
Aggarwal, S
Pasricha, P K
Reddy, B M
Issue Date: Jun-1979
Publisher: NISCAIR-CSIR, India
Abstract: Very frequent degradation in ionosphere-supported communication occurs at low latitudes due to large temporal and spatial electron density gradients in the ionosphere. The dynamic situation during early morning hours and the horizontal gradients in F-region electron density associated with equatorial anomaly cause unusual difficulties in the choice of right operational frequencies. Data from the topside sounder satellite Alou- have been analyzed to derive horizontal gradients in the peak electron density of the F-region. Horizontal gradients in electron density as large as 3000 to 4000 electrons/cm2/km have been observed very often and an effect of such large gradients is to render the ionosphere as a non-mirror-like reflecting layer. The magnitude and the morphology of these problems are discussed to keep the prediction users aware of the conditions.
Page(s): 101-105
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.08(3) [June 1979]

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