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Home Aerospace & Aeronautics Characterization of ionosphere waveguide propagation, by monitoring HAARP HF transmissions in Antarctica

Characterization of ionosphere waveguide propagation, by monitoring HAARP HF transmissions in Antarctica

Description

A new system for monitoring changes in the Earth’s environment caused by our civilization’s technological activity has been developed by the Institute of Radio Astronomy, National Academy of Sciences of Ukraine. The Project was aimed at experimentally investigating the possibility of exciting the ionospheric interlayer duct channel, using powerful radiation waves from the heaters HAARP (Alaska, USA) and EISCAT (Tromsø, Norway), as well as from HF broadcasting stations RWM (Moscow, Russia) and CHU (Ottawa, Canada).

Most attention was paid to analyzing the possibility of exciting the interlayer ionospheric waveguide, which supports super-long range HF propagation, with a small amount of attenuation. To monitor the radiation a compact-sized receiving complex was developed which is capable of measuring the signal intensity and spectral characteristics in an off-line automatic mode. Two facilities of this kind have been constructed in the course of the Project fulfillment. One of these was deployed in Ukraine in 2012 – at the lowfrequency observatory managed by IRA NASU (at Martova village, Kharkiv province); while the other was installed at the Ukrainian Antarctic station ‘Akademik Vernadsky’, in 2013.

In addition, similar receiving complexes were involved in project-related measuring campaigns. A chain of receiving and transmitting sites made it possible to simultaneously investigate probe signal propagation along radio paths of various lengths: specifically, quasi-vertical (less than 100 km), mid-range (up to 3,000 km) and super-longrange (from 10,000 to 16,000 km).

In a number of cases signal strengthening was detected for the super-long-range radio links (Alaska-Antarctica and Northern Scandinavia- Antarctica); this effect can be regarded as a result of waveguide propagation. To explain the mechanisms of waveguide excitation, and extraction of the radio wave energy from it, the effect of aspect-sensitive scattering of signals by natural and artificial field-aligned irregularities of the ionospheric plasma was considered as the basic model. A pioneering feature of the developed theoretical model is the account of regular ionospheric refraction. Aspect-sensitive contours in the ionosphere and on the Earth’s surface have been calculated for all the transmitting and receiving sites, under current ionospheric conditions. As planned, a software package has been developed for the remote control of receiving complexes and visual representation of the measurement results in real-time through the internet.

The results obtained during the project fulfillment have been published in two scientific papers and reported at several international meetings in the USA, Puerto Rico, and Ukraine.


Mounting of the receiving HF antenna in Antarctica at the station "Akademik Vernadsky" (March, 2013).

Contact Details

Yampolskiy Yuriy Moiseevich, Corr. Member of NASU
Organization: Institute of Radio Astronomy, NASU
Address: 4, Chervonopraporna St, Kharkiv 61002, Ukraine
(+380-57) 7203462
This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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