Probing of medium-scale traveling ionospheric disturbances using HF-induced  scatter targets

Blagoveshchenskaya, N. F.; Борисова, Т. Д.; Kornienko, V. N.; Moskvin, I. V.; Rietveld, M. T.; Frolov, V. L.; Uryadov, V. P.; Kagan, L. M.; Yampolski, Yu. M.; Galushko, V. L.; Koloskov, A. V.; Kasheev, S. B.; Galushko, V. G.; Vertogradov, G. G.; Vertogradov, V. G.; Kelley, M. C.

doi:10.5194/angeo-24-2333-2006

Cited by 15 publications

(10 citation statements)

References 26 publications

(29 reference statements)

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“…Djuth et al (1985) found from VHF radar observations during Tromsø HF heating experiments, that the generation of striations in the auroral E-region was possible when the heater frequency, f H , exceeded the critical frequency foEs by 0.2 MHz. The same result was obtained by Blagoveshchenskaya et al (1999Blagoveshchenskaya et al ( , 2006a when strong heaterinduced striations were observed in the auroral E-region with bi-static HF radio scatter. Striations have also been observed from Tromsø HF heating experiments in the night-side Fregion of the auroral ionosphere when foF2 drops below the heater frequency by up to 0.5 MHz (Blagoveshchenskaya et al, 2006b).…”

Section: Introductionsupporting

confidence: 73%

Phenomena induced by powerful HF pumping towards magnetic zenith with a frequency near the F-region critical frequency and the third electron gyro harmonic frequency

Blagoveshchenskaya

Carlson²,

Kornienko

et al. 2009

Ann. Geophys.

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Abstract. Multi-instrument observational data from an experiment on 13 October 2006 at the EISCAT/HEATING facility at Tromsø, Norway are analysed. The experiment was carried out in the evening hours when the electron density in the F-region dropped, and the HF pump frequency f H was near and then above the critical frequency of the F2 layer. The distinctive feature of this experiment is that the pump frequency was just below the third electron gyro harmonic frequency, while both the HF pump beam and UHF radar beam were directed towards the magnetic zenith (MZ). The HF pump-induced phenomena were diagnosed with several instruments: the bi-static HF radio scatter on the LondonTromsø-St. Petersburg path, the CUTLASS radar in Hankasalmi (Finland), the European Incoherent Scatter (EIS-CAT) UHF radar at Tromsø and the Tromsø ionosonde (dynasonde). The results show thermal electron excitation of the HF-induced striations seen simultaneously from HF bi-static scatter and CUTLASS radar observations, accompanied by increases of electron temperature when the heater frequency was near and then above the critical frequency of the F2 layer by up to 0.4 MHz. An increase of the electron density up to 25% accompanied by strong HF-induced electron heating was observed, only when the heater frequency was near the critical frequency and just below the third electron gyro harmonic frequency. It is concluded that the combined effect of upper hybrid resonance and gyro resonance at the same altitude gives rise to strong electron heating, the excitation of Correspondence to: N. F. Blagoveshchenskaya (nataly@aari.nw.ru) striations, HF ray trapping and extension of HF waves to altitudes where they can excite Langmuir turbulence and fluxes of electrons accelerated to energies that produce ionization.

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Section: Introductionsupporting

confidence: 73%

Phenomena induced by powerful HF pumping towards magnetic zenith with a frequency near the F-region critical frequency and the third electron gyro harmonic frequency

Blagoveshchenskaya

Carlson²,

Kornienko

et al. 2009

Ann. Geophys.

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“…In thin semi-transparent E s layers typical of the midlatitude ionosphere, small-scale irregularities were not excited. In the experiments performed with the heating facility in Tromsø, the occurrence of AFAIs in the auroral E region was also observed in the night hours during reflection of a high-power HF O-mode wave from a thick sporadic E s layer when the methods of aspect and backward scattering [28][29][30] were employed.…”

Section: Excitation Of Small-scale Field-aligned Artificial In the Spmentioning

confidence: 91%

“…remains open. In the experiments using the heating facility in Tromsø, the AFAIs were also generated for f h > f 0F 2 (or f 0Es ) both in the nighttime auroral ionospheric F region [14] and in the sporadic E s layer [28,30]. Observations of stimulated luminescence of the perturbed region in the red (wavelength 630 nm) and green (557.7 nm) lines on the HAARP facility [31] show that the luminescence did not decay when the critical frequency was lower than the heater frequency.…”

Section: Some Features Of the Stimulated Electromagnetic Emission Of mentioning

confidence: 99%

The polar-ionosphere phenomena induced by high-power radio waves from the spear heating facility

Blagoveshchenskaya

Борисова

Kornienko

et al. 2008

Radiophys Quantum El

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We present the results of experimental studies of specific features in the behavior of small-scale artificial field-aligned irregularities (AFAIs) and the DM component in the spectra of stimulated electromagnetic emission (SEE). Analysis of experimental data shows that AFAIs in the polar ionosphere are generated under different background geophysical conditions (season, local time, the presence of sporadic layers in the E region, etc.). It is shown that AFAIs can be excited not only in the F region, but also in "thick" sporadic E s layers of the polar ionosphere. The AFAIs were observed in some cycles of heating when the HF heater frequency exceeded the critical frequency by 0.3−0.5 MHz. Propagation paths of diagnostic HF radio waves scattered by AFAIs were modelled for geophysical conditions prevailing during the SPEAR heating experiments. Two components, namely, a narrow-banded one with a Doppler-spectrum width of up to 2 Hz and a broadband one observed in a band of up to 20 Hz, were found in the sporadic E s layer during the AFAI excitation. Analysis of the SEE spectra shows that the behavior of the DM component in time is irregular, which is possibly due to strong variations in the critical frequency of the F 2 layer from 3.5 to 4.6 MHz. An interesting feature observed in the SPEAR heating experiments is that the generation of the DM component was similar to the excitation of AFAIs when the heater frequency was up to 0.5 MHz higher than the critical frequency.

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“…When carrying out experiments with use for diagnostics of a method of aspect scattering [4,7] frequency shifts of the diagnostic transmitter of the same order, as well as recorded by us were received. In general, they correspond to the data obtained by us in these observations and in work [2].…”

Section: Results Of Investigation and Discussionmentioning

confidence: 99%

Observations of electromagnetic radiation of stand EISCAT on Kamchatka

Sivokon

Agranat

2017

E3S Web Conf.

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Abstract.In experiments on active influence on an ionosphere powerful short-wave complexes -heater stands are used. As a result of such influence the set of the physical processes [1] which studying represents scientific interest is formed. One of them is formation artificial fieldaligned irregularities. Studying properties natural field-aligned irregularities on Kamchatka [2], authors have come to a conclusion about possibility of realisation of the received approaches in their studying, on short-wave lines of the big extent. In work results of supervision on Kamchatka of displays of active influence on an ionosphere in Tromse (Norway) are resulted.

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Probing of medium-scale traveling ionospheric disturbances using HF-induced scatter targets

Cited by 15 publications

References 26 publications

Phenomena induced by powerful HF pumping towards magnetic zenith with a frequency near the F-region critical frequency and the third electron gyro harmonic frequency

Phenomena induced by powerful HF pumping towards magnetic zenith with a frequency near the F-region critical frequency and the third electron gyro harmonic frequency

The polar-ionosphere phenomena induced by high-power radio waves from the spear heating facility

Observations of electromagnetic radiation of stand EISCAT on Kamchatka

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