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Solnechno-Zemnaya Fizika
UDC
55

DETERMINATION OF THE VECTOR VELOCITY OF ARTIFICIAL IONOSPHERIC IRREGULARITIES BASED ON DOPPLER MEASUREMENTS BY THE BI-STATIC SCATTER METHOD OF HF RADIO SIGNALS PROPAGATING OVER LONG RADIO PATHS Determination of the vector velocity of artificial ionospheric irregularities based on Doppler measurements by the bi-static scatter method of HF radio signals propagating over long radio paths

Published in Solnechno-Zemnaya Fizika · Pages 79–98 · Rubric: Results of current research
DOI: https://doi.org/10.12737/szf-102202408
Received: 25.10.2023 Accepted: 29.02.2024 Published: 25.06.2024
Authors
TA
Tatiana Borisova
ORCID
NA
Nataly Blagoveshchenskaya
ORCID
AL
Alexey Kalishin
ORCID
AN
Andrey Kovalev
ABSTRACT
During experiments on the modification of the high-latitude ionosphere by high-power HF radio waves of ordinary or extraordinary polarization of the EISCAT/Heating facility (Tromsø, Norway) in 2013, 2016, and 2019, Doppler measurements of diagnostic HF radio signals over long radio paths were carried out by the bistatic scatter method. We studied characteristics of Doppler frequency variations in bistatic scattered radio signals, using the experimental results obtained along radio paths of different lengths (up to ~8500 km) and orientation. We examined numerical dependences of the Doppler frequency variations in a radio signal on the azimuth of the wave vector of a radio wave incident onto an artificially disturbed region, on the bistatic scattering angle, and on the azimuthal direction of irregularity motion in an artificially disturbed region of the ionosphere. From simultaneous measurements of the Doppler frequency fD of the radio signal along two diagnostic radio paths, we numerically estimated the velocity vector of irregularities in the artificially disturbed region of the ionosphere. The total vector velocity of artificial ionospheric irregularities can be calculated from measurements of the Doppler frequency shift along several long diagnostic radio paths after preliminary analysis of experimental observations with the results of trajectory modeling of diagnostic HF radio signals.
KEYWORDS
Radio wave propagation, small-scale artificial ionospheric irregularities, Doppler observations, the EISCAT heating facility, modeling
Funding
The work was financially supported by the Russian Science Foundation (Grant No. 22-17-00020), [https://rscf.ru/project/22-17-00020/]
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