Signal frequency dependence of ionospheric amplitude scintillations

Bhattacharyya, A. ; Rastogi, R. G. ; Yeh, K. C. (1990) Signal frequency dependence of ionospheric amplitude scintillations Radio Science, 25 (4). pp. 289-297. ISSN 0048-6604

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The S4 index, which is a measure of the strength of amplitude scintillations, is assumed to vary with signal frequency f according to S4αf-n, and the frequency exponent n is derived from observed equatorial amplitude scintillations on 40- and 140-MHz signals. A large data base has been used to study the variation of this exponent n(40/140) with the S4 index on the 140-MHz signal for both daytime and nighttime scintillation events. Although the equatorial E and F region irregularities, which cause the observed scintillation events, have different characteristics, the variation of n(40/140) with S4(140) is found to be almost universal. Theoretical computation of n(40/140) for different values of the irregularity parameters yields results which are in good agreement with these observations.

Item Type:Article
Source:Copyright of this article belongs to American Geophysical Union.
ID Code:29022
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