On the solar flare effect of v.l.f.-waves in the lower ionosphere

Physics

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Scientific paper

The change of the equivalent reflection height h' with time has been determined from 15 selected solar flare effects of the transmitter GBR (16 kc/s) measured in Berlin. With help of a plausible ionospheric model it is possible to attach to each height h' a corresponding electron density N. The parameters of an effective recombination law and an effective attachment law have been determined from the course of h' with time. If the normal D-layer becomes simply strengthened during a solar flare only the attachment law is applicable. The average effective attachment coefficient is [beta] = 3E4 × 10-3 sec-1 in 70 km height. If a new layer produced by X-rays is built up during a solar flare below the normal D-layer the recombination law obtains validity. The average value of the product of the effective recombination coefficient [alpha] and the normal electron density N0 is [alpha]N0 = 2.9 × 10-4 sec-1 in 70 km height.

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