Effects of large-scale clouds of ionosphericirregularities on the propagation of high-frequency radiowaves

Afanasiev, N.T.; Zheonykh, A.A.; Sazhin, V. I.; Tinin, M. V.; Ivelskaya, M.K.

doi:10.1016/s1364-6826(98)00087-x

Cited by 4 publications

(3 citation statements)

References 1 publication

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“…This is correct for IRI, but could be incorrect in the actual ionosphere. In the presence of strong gradients and medium-size irregularities the model could be modified following the prescription posted by Afanasiev et al (1998), but this would need a much more accurate ionospheric model than what we have used at this point.…”

Section: Discussion On Model Accuracymentioning

confidence: 99%

Seasonal and Diurnal Dynamics of Radio Noise for 8–20 MHz Poleward‐Oriented Mid‐Latitude Radars

et al. 2022

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Based on ray tracing in a smooth ionosphere described by the IRI‐2012 model we have inferred the seasonal‐diurnal dynamics of radio noise observed by four mid‐latitude high‐frequency (HF) radars. In the calculations, noise is assumed to be homogeneous and stationary, but the main contribution comes from the radar skip zone boundary due to focusing radiowaves effect. Noise absorption along the ray path is simulated from the IRI‐2012 electron density, and from the molecular nitrogen density and electron temperatures obtained from the NRLMSISE‐00 model. Earth magnetic field is not taken into account both in the absorption and ray‐tracing calculations due to insufficient accuracy of the ionospheric model. The model results are compared with experimental radar data, and good agreement between the two is demonstrated. It is shown that experimentally observed seasonal and diurnal dynamics of the noise correlates well with model predictions. We demonstrated saturation effect at low noise levels. The model makes it possible to estimate the amount of absorption in D‐ and E‐layers using noise observations at SuperDARN and SuperDARN‐like poleward‐oriented radars, especially at mid‐latitudes. This is important for the retrieval of long term variations in the electron density in the lower ionosphere, by using wide coverage provided by these radars' network. The model also makes it feasible to interpret vertical absorption by experimental noise observations, thereby significantly expanding the capability of HF radars to monitor the lower ionosphere, and to provide data for joint analysis with other data, obtained by these radars at E‐ and F‐layer heights.

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Section: Discussion On Model Accuracymentioning

confidence: 99%

Seasonal and Diurnal Dynamics of Radio Noise for 8–20 MHz Poleward‐Oriented Mid‐Latitude Radars

et al. 2022

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“…With a very small value of θ ∂ , by taking into account the expression (3), we can calculate the gradient of refractive index as following: Then, by the expression of the Snell's law (2) we can calculate the angle of incidence for a next movement step of radio wave:…”

Section: A Methods For Constructing Trajectory Hf Radio Wavementioning

confidence: 99%

“…There are also methods based on numerical integration of the system of radial equations to the ionosphere with changing in vertical and horizontal directions of the electron density N. These methods (for example, we can mention the work of V.I. Sazhin [2]) provide prediction results of the arrival and elevation angles more precisely compared to ones given by CCIR method. However, these methods do not provide high speed of calculating characteristics HF radio waves.…”

Section: Introductionmentioning

confidence: 99%

The Rationale for the Method of Calculating the Angles of Arrival of Short Radio Waves Taking Into Account the Influence of Regular and Random Inhomogeneities of the Ionosphere

Agaryshev

Nguyen

2019

Journal of Siberian Federal University. Engineering &Amp; Technologies

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The article presents a reasonable method of calculating the angles of elevation of short radio waves with the influence of regular and random inhomogeneities of the ionosphere. The method calculates short radio waves (HF) through the horizontal inhomogeneous scattering ionosphere. The technique is based on application of the law of refraction of Snell’s for well-known models of the ionosphere and its evolution in the irregular parts. The description of the program to calculate the angles of radiation and reception HF is presented. The results of calculating the angles of arrival are compared with measurements of angles of arrival of HF. We obtained the best agreement between the experimental and the calculated resultsl of arrival angles of HF than for the regular ionosphere. The use of techniques is discussed in the article

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Artificial refraction of radiowaves in the ionosphere

Kopeikin

2003

Journal of Atmospheric and Solar-Terrestrial Physics

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Effects of large-scale clouds of ionosphericirregularities on the propagation of high-frequency radiowaves

Cited by 4 publications

References 1 publication

Seasonal and Diurnal Dynamics of Radio Noise for 8–20 MHz Poleward‐Oriented Mid‐Latitude Radars

Seasonal and Diurnal Dynamics of Radio Noise for 8–20 MHz Poleward‐Oriented Mid‐Latitude Radars

The Rationale for the Method of Calculating the Angles of Arrival of Short Radio Waves Taking Into Account the Influence of Regular and Random Inhomogeneities of the Ionosphere

Artificial refraction of radiowaves in the ionosphere

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