Positioning of Ionospheric Irregularities and the Earth’s Surface Roughness Using an Over-the-Horizon HF Radar

Uryadov, V. P.; Vertogradov, G. G.; Sklyarevsky, M. S.; Vybornov, F. I.

doi:10.1007/s11141-018-9838-y

Cited by 5 publications

(3 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This causes a significant dependence of the GS signal on the landscape and the season (Ponomarenko et al, 2010). In the case of presence of significant inhomogeneities, for example, mountains (Uryadov et al, 2018), (x) may cause the appearance of additional maxima and minima in the GS signal. For relatively homogeneous surfaces, the position of the GS maximum remains almost unchanged, and the GS signal propagation trajectory (radar-surface-radar) Hall et al, 1997;Ponomarenko et al, 2016;Yukimatu & Tsutsumi, 2002).…”

Section: Space Weathermentioning

confidence: 99%

Global Diagnostics of Ionospheric Absorption During X‐Ray Solar Flares Based on 8‐ to 20‐MHz Noise Measured by Over‐the‐Horizon Radars

et al. 2019

View full text Add to dashboard Cite

An analysis of noise attenuation during 80 solar flares between 2013 and 2017 was carried out at frequencies 8–20 MHz using 34 Super Dual Auroral Radar Network radars and the EKB ISTP SB RAS radar. The attenuation was determined on the basis of noise measurements performed by the radars during the intervals between transmitting periods. The location of the primary contributing ground sources of noise was found by consideration of the propagation paths of radar backscatter from the ground. The elevation angle for the ground echoes was determined through a new empirical model. It was used to determine the paths of the noise and the location of its source. The method was particularly well suited for daytime situations, which had to be limited for the most part to only two crossings through the D region. Knowing the radio path was used to determine an equivalent vertical propagation attenuation factor. The change in the noise during solar flares was correlated with solar radiation lines measured by GOES/XRS, GOES/EUVS, SDO/AIA, SDO/EVE, SOHO/SEM, and PROBA2/LYRA instruments. Radiation in the 1 to 8 Å and near 100 Å are shown to be primarily responsible for the increase in the radionoise absorption, and by inference, for an increase in the D and E region density. The data are also shown to be consistent with a radar frequency dependence having a power law with an exponent of −1.6. This study shows that a new data set can be made available to study D and E regions.

show abstract

Section: Space Weathermentioning

confidence: 99%

Global Diagnostics of Ionospheric Absorption During X‐Ray Solar Flares Based on 8‐ to 20‐MHz Noise Measured by Over‐the‐Horizon Radars

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The selected platform (SDRlab 122-16) provides the possibility of combining and synchronizing several boards [30]. Therefore, multichannel registration of ionograms using phased antenna arrays can be implemented, which will allow determining the polarization and the angle of arrival of signals reflected from the ionosphere [31,32]. Since the ION-FAST ionosonde has two receiving channels, it is possible to measure the frequency dependences of the Doppler frequency shifts of each ionospheric mode [33] without additional hardware upgrades.…”

Section: Discussionmentioning

confidence: 99%

ION-FAST as the NIRFI’s Ionospheric Diagnostic Platform

Moiseev,

Shindin,

Grekhneva

et al. 2024

Atmosphere

View full text Add to dashboard Cite

In December 2021, we presented a prototype of a fast ionosonde for vertical sounding based on the usage of publicly available radio-electronic components. This approach led to a major reduction in the cost of the created device. We called our development ION-FAST, which characterizes the key feature of the ionosonde: the possibility of continuous operation at a speed of one ionogram per second, which is required to study the rapid processes of redistribution of the electron concentration during heating experiments. In May 2022, an ionosonde for vertical sounding of the ionosphere, developed at the Radiophysical Research Institute of Nizhni Novgorod (NIRFI), was put into continuous operation at the SURA facility. This report provides a description of the improvements made to the prototype over the last year and the path to be passed from idea to implementation. The results of the first months of the prototype’s operation (especially the results of the supporting optic experiment in August 2022), as well as prospects for further use and modernization, are provided. In addition, the realization of the oblique chirp-sounding receiver prototype as an extension of the proposed diagnostic platform’s functionality, including the first results, is presented.

show abstract

“…On the basis of this tool, experimental studies of radio wave propagation on paths with various ranges and directions through natural and artificially disturbed ionospheres have been conducted (Uryadov et al, ). Possibilities of the chirp ionosonde‐radiodirection finder for HF OTHR location of the Earth's ionosphere in planetary scale are shown in Uryadov et al ().…”

Section: Introductionmentioning

confidence: 99%

Real‐Time Techniques for Interpretation of Ionospheric Backscatter Sounding Data

et al. 2019

View full text Add to dashboard Cite

We present techniques and algorithms for automatic processing and interpretation of data of ionospheric backscatter sounding (BS) using a continuous chirp signal. Experimental ionograms are processed based on data filtration with further compression using the cellular automaton method. Interpretation of signals in a backscatter ionogram is carried out by calculating the backscatter leading edge. Slightly changing ratios of frequency dependences for group characteristics of oblique sounding and BS signals in various heliogeophysical conditions are used. Parameters of radio wave propagation are calculated within the waveguide approach using the International Reference Ionosphere model. The results of interpretation for a BS ionogram allow quick determination of maximum usable frequencies, from which characteristics of oblique sounding signals are corrected for given radio paths in the sounding sector of interest.

show abstract

Positioning of Ionospheric Irregularities and the Earth’s Surface Roughness Using an Over-the-Horizon HF Radar

Cited by 5 publications

References 16 publications

Global Diagnostics of Ionospheric Absorption During X‐Ray Solar Flares Based on 8‐ to 20‐MHz Noise Measured by Over‐the‐Horizon Radars

Global Diagnostics of Ionospheric Absorption During X‐Ray Solar Flares Based on 8‐ to 20‐MHz Noise Measured by Over‐the‐Horizon Radars

ION-FAST as the NIRFI’s Ionospheric Diagnostic Platform

Real‐Time Techniques for Interpretation of Ionospheric Backscatter Sounding Data

Contact Info

Product

Resources

About