Contrasting O/X‐mode heater effects on O‐mode sounding echo and the generation of magnetic pulsations

Kuo, Spencer; Cheng, Wei Te; Snyder, Arnold; Kossey, Paul; Battis, James C

doi:10.1029/2009gl041471

Cited by 11 publications

(7 citation statements)

References 14 publications

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“…However, the same Ne enhancements occurred even when the pump 185 frequency exceeded the fxF2 from 17.30 UT (fH > fxF2). As was shown by Kuo et al (2010), an 186 X-mode HF pump wave moves the ionospheric F-region upward. The origin of apparent strong 187…”

mentioning

confidence: 91%

“…However, for the small-scale FAIs excited, 291 when high-power X-mode HF radio wave did not reflect from the ionosphere (fH > fxF2), the 292 most plausible mechanism for their generation could be closely related to and driven by the HF-293 induced large-scale artificial irregularities. An X-polarized HF pump wave heats the F-region of 294 the ionosphere through collision processes more effectively as compared with the O-mode HF 295 pumping (Kuo et al, 2010). The artificial large-scale irregularities are formed at the heater 296 frequencies above and below the foF2 by the growth of a self-focusing instability of an HF pump 297 wave beam (Gurevich, 1978; Vas'kov and Gurevich, 1979).…”

Section: Experiments On 28 October 2013 216mentioning

confidence: 99%

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Modification of the high latitude ionosphere F region by X-mode powerful HF radio waves: Experimental results from multi-instrument diagnostics

Blagoveshchenskaya

Борисова

Yeoman

et al. 2015

Journal of Atmospheric and Solar-Terrestrial Physics

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Abstract. We present experimental results concentrating on a variety of phenomena in 1 the high latitude ionosphere F2 layer induced by an extraordinary (X-mode) HF pump wave at 2 high heater frequencies (fH = 6.2 -8.0 MHz), depending on the pump frequency proximity to the 3 ordinary and extraordinary mode critical frequencies, foF2 and fxF2. The experiments were 4 carried out at the EISCAT HF heating facility with an effective radiated power of in October 2012 and October -November 2013. Their distinctive feature is a wide diapason of 6 critical frequency changes, when the fH /foF2 ratio was varied through a wide range from 0.9 to 7 1.35. It provides both a proper comparison of X-mode HF-induced phenomena excited under 8 different ratios of fH /foF2 and an estimation of the frequency range above foF2 in which such X-9 mode phenomena are still possible. It was shown that the HF-enhanced ion and plasma lines are 10 excited above foF2 when the HF pump frequency is lying in a range between the foF2 and fxF2, 11 foF2 ≤ fH ≤ fxF2, whereas small-scale field-aligned irregularities continued to be generated even 12 when fH exceeded fxF2 by up to 1 MHz and an X-polarized pump wave cannot be reflected from 13 the ionosphere. Another parameter of importance is the magnetic zenith effect (HF beam/radar 14 angle direction) which is typical for X-mode phenomena under fH /foF2 >1 as well as fH / foF2≤ 15 1. We have shown for the first time that an X-mode HF pump wave is able to generate strong 16 narrow band spectral components in the SEE spectra (within 1 kHz of pump frequency) in the 17 ionosphere F region, which were recorded far away from the HF heating facility. The observed 18 spectral lines can be associated with the ion acoustic, electrostatic ion cyclotron, and electrostatic 19 ion cyclotron harmonic waves (otherwise known as neutralized ion Bernstein waves). It is 20 suggested that these spectral components can be attributed to the stimulated Brillion scatter 21 (SBS) process. The comparison between the O-and X-mode narrow band spectra clearly 22 demonstrated that only an X-polarized pump wave scattered by SBS can propagate more than 23 one thousand km without significant deterioration. 24 25

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mentioning

confidence: 91%

Section: Experiments On 28 October 2013 216mentioning

confidence: 99%

Modification of the high latitude ionosphere F region by X-mode powerful HF radio waves: Experimental results from multi-instrument diagnostics

Blagoveshchenskaya

Борисова

Yeoman

et al. 2015

Journal of Atmospheric and Solar-Terrestrial Physics

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“…According to [42], there is generation of solenoidal currents encircling the high-power radio-wave beam, which can contribute to the generation of large-scale irregularities at its boundary. The generation of such currents was recently confirmed experimentally in [43,44].…”

Section: Edge Effectmentioning

confidence: 99%

Peculiarities of Excitation of Large-Scale Plasma Density Irregularities During Modification of the Ionospheric F 2 Region by High-Power HF Radio Waves

Frolov

Schorokhova

Куницын

et al. 2016

Radiophys Quantum El

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We present the experimental results concerning the features of large-scale artificial plasma-density irregularities excited in the ionospheric F 2 region by high-power HF radio waves. The experiments were performed in recent years using the SURA heating facility. It is shown that at the altitude of the pump-wave reflection, these irregularities are most efficiently generated in the magnetic zenith region. The effect of enhancement of the large-scale irregularity generation at the edge of the pump-wave beam is revealed. The results of studying large-scale irregularities recorded at the altitudes of the topside ionosphere are presented. Experimental results concerning the features of the internal gravity waves generated at the ionospheric altitudes during periodic heating of the ionospheric plasma by high-power HF radio waves are summarized and their possible influence on generation of artificial ionospheric irregularities at a long distance from the heater is discussed.

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“…At the same time, our mechanism is significantly different from the mechanism of generation of geomagnetic fluctuations directly within the antenna pattern of the heater, which is related with the development of the filamentation instability. This mechanism was considered in [35][36][37][38]). …”

Section: Drag Of Charged Particles By the Wavementioning

confidence: 99%

Geomagnetic Pulsation Amplitude and Spectrum Variations Accompanying the Ionospheric Heating by High-Power Radio waves from the Sura Facility

Черногор

Frolov

2014

Radiophys Quantum El

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Aperiodic and quasiperiodic variations in the geomagnetic pulsation amplitude in a range of periods from 40 to 1000 s, which accompany the quasicontinuous and periodic impact on the ionospheric plasma by high-power radio waves from the SURA facility near Nizhny Novgorod (Russia) were recorded near Kharkov (Ukraine) using a magnetometer-fluxmeter. The main parameters of aperiodic and quasiperiodic disturbances of the geomagnetic field are determined. The mechanisms for generation and propagation of detected disturbances are discussed.

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Contrasting O/X‐mode heater effects on O‐mode sounding echo and the generation of magnetic pulsations

Cited by 11 publications

References 14 publications

Modification of the high latitude ionosphere F region by X-mode powerful HF radio waves: Experimental results from multi-instrument diagnostics

Modification of the high latitude ionosphere F region by X-mode powerful HF radio waves: Experimental results from multi-instrument diagnostics

Peculiarities of Excitation of Large-Scale Plasma Density Irregularities During Modification of the Ionospheric F 2 Region by High-Power HF Radio Waves

Geomagnetic Pulsation Amplitude and Spectrum Variations Accompanying the Ionospheric Heating by High-Power Radio waves from the Sura Facility

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