Back-scattering of radio waves from the artificially perturbed F-region of the ionosphere

1976 ◽  
Vol 19 (7) ◽  
pp. 769-771 ◽  
Author(s):  
V. V. Belikovich ◽  
E. A. Benedictov ◽  
G. G. Getmantsev ◽  
Yu. A. Ignat'ev ◽  
G. P. Komrakov
Keyword(s):  
Radio Waves ◽  
F Region ◽  
Back Scattering

scholarly journals HF-Induced Modifications of the Electron Density Profile in the Earth’s Ionosphere Using the Pump Frequencies near the Fourth Electron Gyroharmonic

2021 ◽  
Vol 13 (23) ◽  
pp. 4895
Author(s):  
Alexey V. Shindin ◽  
Evgeny N. Sergeev ◽  
Savely M. Grach ◽  
Gennady M. Milikh ◽  
Paul Bernhardt ◽  
...  
Keyword(s):  
Density Profile ◽  
Ionospheric Plasma ◽  
Pump Wave ◽  
Electromagnetic Emission ◽  
Electron Density Profile ◽  
Radio Waves ◽  
F Region ◽  
Plasma Density Profile ◽  
Hybrid Region ◽  
Hf Heating

We discuss results on plasma density profile modifications in the F-region ionosphere that are caused by HF heating with the frequency f0 in the range [(−150 kHz)–(+75 kHz)] around the fourth electron gyroharmonic 4fc. The experiments were conducted at the HAARP facility in June 2014. A multi-frequency Doppler sounder (MDS), which measures the phase and amplitude of reflected sounding radio waves, complemented by the observations of the stimulated electromagnetic emission (SEE) were used for the diagnostics of the plasma perturbations. We detected noticeable plasma expulsion from the reflection region of the pumping wave and from the upper hybrid region, where the expulsion from the latter was strongly suppressed for f0 ≈ 4fc. The plasma expulsion from the upper hybrid region was accompanied by the sounding wave’s anomalous absorption (AA) slower development for f0 ≈ 4fc. Furthermore, slower development and weaker expulsion were detected for the height region between the pump wave reflection and upper hybrid altitudes. The combined MDS and SEE allowed for establishing an interconnection between different manifestations of the HF-induced ionospheric turbulence and determining the altitude of the most effective pump wave energy input to ionospheric plasma by using the dependence on the offset between f0 and 4fc.

scholarly journals Nonlinear forecasts of ƒ<i>o</i>F2: variation of model predictive accuracy over time

2002 ◽  
Vol 20 (7) ◽  
pp. 1031-1038 ◽  
Author(s):  
A. H. Y. Chan ◽  
P. S. Cannon
Keyword(s):  
Real Time ◽  
Space Weather ◽  
Predictive Accuracy ◽  
Radio Waves ◽  
New Techniques ◽  
Radio Science ◽  
F Region ◽  
Instruments And Techniques ◽  
Using Data ◽  
Hf Communications

Abstract. Space weather effects can strongly influence high-frequency (HF) communications by changing the ionospheric environment through which the radio waves propagate. Since many systems utilize HF communications, the ability to make real-time assessments of propagation conditions is an important part of space weather monitoring systems. In this paper, we present new techniques for measuring high-latitude HF communications link parameters using data from SuperDARN radars. These techniques use ground-scatter returns to define the variation in skip distance with frequency. From these data, the maximum usable frequency (MUF) as a function of range is determined and ionospheric critical frequencies are estimated. These calculations are made in near-real-time and the results are made available on the World Wide Web. F-region critical frequencies calculated using this method show good agreement with ionosonde data.Key words. Ionosphere (active experiments; instruments and techniques) – Radio science (ionospheric propagation)

Correlation theory of the back scattering of radio waves

1971 ◽  
Vol 14 (9) ◽  
pp. 1045-1048 ◽  
Author(s):  
N. G. Denisov ◽  
V. V. Tamoikin
Keyword(s):  
Radio Waves ◽  
Correlation Theory ◽  
Back Scattering

scholarly journals Usage of regularization techniques for effective electron collision frequency determination from oblique ionospheric sounding

1996 ◽  
Vol 14 (8) ◽  
pp. 811-815 ◽  
Author(s):  
P. F. Denisenko ◽  
N. V. Nastasyina ◽  
V. I. Vodolazkin
Keyword(s):  
Measurement Errors ◽  
Computer Modelling ◽  
Collision Frequency ◽  
Electron Collision ◽  
Radio Waves ◽  
Absorption Data ◽  
Effective Electron ◽  
F Region ◽  
Electron Collision Frequency ◽  
Regularization Techniques

Abstract. Computer modelling is used to investigate the possibility of determining ionospheric parameters from slightly oblique ionospheric soundings, using absorption data for decametric radio waves of different polarization. It is shown that with mean square measurement errors of 0.5 dB, and using regularization algorithms to solve the inverse problems, electron collision frequency profiles can be obtained for the night F-region with errors of less than 30%. Both temperatures of electrons and neutrals are also determined to within 10%.

scholarly journals Determining characteristics of HF communications links using SuperDARN

2002 ◽  
Vol 20 (7) ◽  
pp. 1023-1030 ◽  
Author(s):  
J. M. Hughes ◽  
W. A. Bristow ◽  
R. A. Greenwald ◽  
R. J. Barnes
Keyword(s):  
Real Time ◽  
Space Weather ◽  
Radio Waves ◽  
New Techniques ◽  
Radio Science ◽  
F Region ◽  
Instruments And Techniques ◽  
Using Data ◽  
Hf Communications ◽  
Good Agreement

Abstract. Space weather effects can strongly influence high-frequency (HF) communications by changing the ionospheric environment through which the radio waves propagate. Since many systems utilize HF communications, the ability to make real-time assessments of propagation conditions is an important part of space weather monitoring systems. In this paper, we present new techniques for measuring high-latitude HF communications link parameters using data from SuperDARN radars. These techniques use ground-scatter returns to define the variation in skip distance with frequency. From these data, the maximum usable frequency (MUF) as a function of range is determined and ionospheric critical frequencies are estimated. These calculations are made in near-real-time and the results are made available on the World Wide Web. F-region critical frequencies calculated using this method show good agreement with ionosonde data.Key words. Ionosphere (active experiments; instruments and techniques) – Radio science (ionospheric propagation)

RUSSIAN HIGH-LATITUDE NETWORK OF OBLIQUE IONOSPHERIC SOUNDING

2021 ◽  
pp. 5-13
Author(s):  
D. D. Rogov ◽  
◽  
V. M. Vystavnoi ◽  
N. F. Blagoveshchenskaya ◽  
P. E. Baryshev ◽  
...  
Keyword(s):  
High Latitude ◽  
Communication Systems ◽  
Arctic Region ◽  
Small Scale ◽  
Radio Waves ◽  
Radio Communication ◽  
Remote Diagnostics ◽  
F Region ◽  
High Latitude Ionosphere ◽  
Ionospheric Sounding

The network for monitoring the high-latitude ionosphere by the method of oblique ionospheric sounding deployed in the Russian Arctic region is considered. The study describes the main results of operational data processing for studying the high-latitude ionosphere and determining the conditions for the optimum operation of radio communication systems and over-the-horizon radars in this region. The study demonstrates the potential of the network as a tool for the remote diagnostics of parameters of small-scale artificial ionospheric irregularities induced by powerful HF radio waves in the mid-latitude ionospheric F-region.

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