Airglow during ionospheric modifications by the sura facility radiation. experimental results obtained in 2010

Грач, С. М.; Клименко, В. В.; Shindin, Alexey; Nasyrov, I. A.; Сергеев, Е. Н.; Yashnov, V. A.; Pogorelko, N. A.

doi:10.1007/s11141-012-9347-3

Cited by 15 publications

(12 citation statements)

References 42 publications

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“…The optical emission intensity is usually maximum near the magnetic field-aligned direction even when there is more pump power in other directions. These observations are consistent with previous results from HAARP (Pedersen et al 2003 and Sura (Grach et al, 2007(Grach et al, , 2012. These observations suggest that the mechanism which accelerates suprathermal electrons, believed to include upper-hybrid resonance, is aspect sensitive and more efficient parallel to the magnetic field line compared to the direction where most pump power is being transmitted.…”

Section: Resultssupporting

confidence: 92%

“…Early experiments performed at the EISCAT HF transmitter facility (Kosch et al 2000(Kosch et al , 2002b and High Frequency Active Auroral Research Program (HAARP) Carlson 2001, Pedersen et al 2003) showed the unexpected result that the pump-induced optical emissions were most intense close to the magnetic zenith (approximately 12°S of zenith at EISCAT). When the pump beam was directed between vertical and the magnetic field direction, the brightest optical emissions appeared displaced towards the magnetic zenith at EISCAT Rietveld et al, 2003Rietveld et al, , 2004, HAARP (Pedersen and Carlson 2001, Pedersen et al 2003 and Sura facilities (Grach et al, 2007(Grach et al, , 2012. This included cases where the most intense optical emissions occurred outside of the −3-dB locus of the pump beam for pumping in the vertical direction.…”

Section: Introductionmentioning

confidence: 99%

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Aspect angle sensitivity of pump-induced optical emissions at EISCAT

et al. 2014

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We investigate the aspect angle sensitivity of the pump-induced artificial optical emissions in the ionosphere over the European Incoherent Scatter Scientific Association (EISCAT) high-frequency transmitter facility at Ramfjord, Norway, as a function of the pump beam launch angle relative to the magnetic field line direction. The highest intensity optical emissions occur when the pump beam pointing direction is in the magnetic zenith (approximately 12°S of local zenith). For pump beam directions further north from field aligned, the optical emission intensity decreases for the same pump power. In addition, the primary photon-emitting region becomes displaced towards the magnetic zenith relative to the pump beam and for larger aspect angles, the brightest emissions were found to be outside the −3-dB pump beam width. The Cooperative UK Twin-Located Auroral Sounding System (CUTLASS) coherent scatter high-frequency (HF) radar detected a quasi-constant level of backscatter power from the pumped ionosphere, indicating that saturated striations were formed for all pump beam directions. This indicates that the presence of upper-hybrid resonance is not sufficient to explain the angular sensitivity of the optical emissions.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Aspect angle sensitivity of pump-induced optical emissions at EISCAT

et al. 2014

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“…The HF beam was inclined to the south of vertical by 12 ∘ . In this case most intensive airglow patch is situated in the magnetic zenith (Grach et al, 2012. The results of the observations are summarized in Figure 2, organized similar to Figure 1.…”

Section: Resultssupporting

confidence: 68%

“…Such chain of phenomena explains, in our opinion, the reason for the proximity between the airglow patches and the STEC cavities. The pump wave trapping into large inhomogeneities (depletions) elongated along the magnetic field is demonstrated, for example, by Gurevich et al (1999) and Grach et al (2012). A physical model correlated the observed increase in HF-induced airglow and the plasma cavities were discussed in Bernhardt et al (1989) in application to experiments at Arecibo.…”

Section: Summary and Discussionmentioning

confidence: 97%

Mutual Allocation of the Artificial Airglow Patches and Large‐Scale Irregularities in the HF‐Pumped Ionosphere

Грач

Nasyrov

Kogogin

et al. 2018

Geophysical Research Letters

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The paper reports first simultaneous observations of artificial emission of 630‐nm oxygen red line, along with perturbations of slant total electron content (STEC). They were induced by the high‐frequency (HF) ionospheric heating produced by the SURA facility situated near Nijniy Novgorod, Russia. The HF heating affects differently the optical emission and STEC. While the patches of the artificial airglow are close to the area of the reduced STEC, the STEC increases at the periphery of the patches. Thus, the artificial airglow occurs mostly inside the large plasma cavities.

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“…Many phenomena in the HF-pumped volume such as artificial airglow, descending artificial ionization layers, and pump-induced plasma irregularities, exhibit dependence on the angle of incidence, α, between the pump beam and the vertical (Grach et al, 2007(Grach et al, , 2012(Grach et al, , 2018Kosch et al, 2004Kosch et al, , 2014Mishin et al, 2016;Najmi et al, 2015;Pedersen & Carlson, 2001;Pedersen et al, 2009;Rietveld et al, 2003;Sergeev et al, 2013;Yampolski et al, 2019). Understanding these phenomena requires a systematic study of the SEE properties' α dependence, particularly near gyroharmonics.…”

Section: 1029/2019gl082890mentioning

confidence: 99%

Properties of the Stimulated Electromagnetic Emissions During the Inclined High‐Frequency Pumping of the Ionosphere Near the Fourth Electron Gyroharmonic at the High‐Frequency Active Auroral Research Program Facility

Shindin

Грач

Сергеев

et al. 2019

Geophysical Research Letters

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Many phenomena in the high‐frequency pumped ionosphere exhibit dependence on the pump beam incident angle α. This motivates a systematic study of the α dependence of the stimulated electromagnetic emission (SEE), particularly near electron gyroharmonics. We report the first observations of stationary SEE spectra for α ranging from −28° (north) to 28° (south) at three receiving sites, for the pump frequency (f0) sweeping near the fourth gyroharmonic (4fc). The following is established: (i) For pumping near the magnetic zenith (α = 7°, 14°, 21°), when existent dynamic broad upshifted maximum in the SEE spectrum indicates that artificial ionization layers are excited, suppression of the downshifted maximum at f0 ≈ 4fс is weakest, and 4fс increases. (ii) Weaker similar effects occur for α = −14° (a condition called “mirror magnetic zenith”). (iii) For northern pump beam inclinations, the SEE intensity decreases (in comparison with southern inclinations and vertical), most strongly at the southernmost receiving site.

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Airglow during ionospheric modifications by the sura facility radiation. experimental results obtained in 2010

Cited by 15 publications

References 42 publications

Aspect angle sensitivity of pump-induced optical emissions at EISCAT

Aspect angle sensitivity of pump-induced optical emissions at EISCAT

Mutual Allocation of the Artificial Airglow Patches and Large‐Scale Irregularities in the HF‐Pumped Ionosphere

Properties of the Stimulated Electromagnetic Emissions During the Inclined High‐Frequency Pumping of the Ionosphere Near the Fourth Electron Gyroharmonic at the High‐Frequency Active Auroral Research Program Facility

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