DOI: https://doi.org/10.18524/1810-4215.2019.32.181778

FREQUENCY DEPENDENCE OF THE IONOSPHERE SCINTILLATION PARAMETERS ON THE OBSERVATIONS OF COSMIC RADIO SOURCES AT THE DECAMETER WAVE RANGE

S K. Panishko, O. A. Lytvynenko

Анотація


When signal from radio source propagates through irregularity layer in the ionosphere it has fluctuations of the amplitude (scintillations) which time spectrum has power form with index α = 3. It was shown that such form of the time spectrum of amplitude fluctuations caused by power form of the spatial spectrum of electron concentration ionosphere irregularity with index ρ = α + 1, i.e. ρ = 4. Based on theoretical preconditions for such form of the spatial spectrum the frequency dependence of scintillation index m (scintillation intensity characteristic) was obtained in form power function: m ∝ f −n , n = (ρ + 2) 4 ⁄ , thus n= 1.5. Similar frequency dependence of the scintillation index was observed experimentally for case of weak scintillations (m < 0.5). In this work the frequency dependence of scintillation parameters was analyzed on long-term observations of power cosmic radio sources on radio telescope URAN-4 at 20 and 25 MHz. The results were compared with results of earlier carried out investigations.


Ключові слова


radio sources: ionosphere scintillations, decameter range, frequency dependence

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Посилання


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