Abstract
Recent in situ measurements and scintillation spectra suggest a power law irregularity spectrum in the F region ionosphere with a large outer-scale dimension (∼100 km). This result is consistent with the ‘near-field’ scintillation approximation, since Fresnel filtering attenuates irregularity structure larger than (πλz)1/2, about 1 km. Consequently, the observed scintillation scale (∼1 km) is much smaller than the outer-scale dimension of the irregularities. Theoretical calculations show that Gaussian irregularities cannot explain these differences in scale. The wavelength dependence based on small scintillation levels has most often been reported as approximately λ¹ and λ² for interplanetary and ionospheric scintillation, respectively. Differences between these measurements and the theoretical dependence are discussed.
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