Characterization of Artificial, Small-Scale, Ionospheric Irregularities in the High-Latitude F Region Induced by High-Power, High-Frequency Radio Waves of Extraordinary Polarization

Blagoveshchenskaya, N. F.; Борисова, Т. Д.; Калишин, А. С.; Yeoman, T. K.; Schmelev, Yu. A.; Leonenko, E. E.

doi:10.1134/s0016793219060045

Cited by 11 publications

(15 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is important to note that at lower heater frequencies the excitation threshold of the X-mode FAIs is much less. Blagoveshchenskaya et al (2019) found that during the EISCAT X-mode power stepping experiment at a heater frequency f H = 4.040 MHz the threshold of ERP for the FAI excitation was about 45 MW. It is also evident from Figure 8 that similar to the experiments on 3 November 2013 and 26 October 2013 described above, the X-mode HFPLs and HFILs were much stronger as compared to the O-mode ones.…”

Section: 1029/2020ja028203mentioning

confidence: 99%

“…The comparable analysis of the HFPL, HFIL, and FAI behaviors on 3 November 2013 (f H = 6.2 MHz) and 26 October 2013 (f H = 6.96 MHz) has revealed that FAIs play a key role in the excitation of a nonresonant PDI under X-mode HF pumping. The generation conditions and features of the X-mode FAIs excited in the high-latitude ionosphere F region at different pump frequencies from 4 to 8 MHz have been intensively investigated from numerous EISCAT heating experiments by Blagoveshchenskaya et al (2011Blagoveshchenskaya et al ( , 2013Blagoveshchenskaya et al ( , 2015Blagoveshchenskaya et al ( , 2019. It was found that the X-mode FAI excitation occurred in two steps.…”

Section: Journal Of Geophysical Research: Space Physicsmentioning

confidence: 99%

See 1 more Smart Citation

Distinctive Features of Langmuir and Ion‐Acoustic Turbulences Induced by O‐ and X‐Mode HF Pumping at EISCAT

et al. 2020

Self Cite

View full text Add to dashboard Cite

We report experimental results regarding the distinctive features and behaviors of high‐frequency (HF)‐induced Langmuir and ion‐acoustic turbulences induced by ordinary (O‐mode) and extraordinary (X‐mode) polarized powerful HF radio waves injected into the high‐latitude ionosphere F region toward the magnetic zenith at EISCAT (European Incoherent SCATter). Alternating O‐/X‐mode pumping was produced at high heater frequencies in the range fH = 6–8 MHz during magnetically quiet background geophysical conditions. An effective radiated power of 450–600 MW was utilized. The radical distinction between the temporal evolution of the O‐ and X‐mode Langmuir and ion‐acoustic plasma waves after the HF heater is switched on in conjunction with the development of artificial field‐aligned irregularities (FAIs) was analyzed. It was found that the excitation thresholds of the Langmuir and ion‐acoustic turbulences significantly differed for the O‐ and X‐mode HF pumping. We have revealed that the X‐mode excitation thresholds for HF‐induced plasma and ion line backscatter are 0.47 and 0.61 V/m, respectively. The persistent O‐mode plasma and ion line backscatters that coexisted with FAIs showed excitation thresholds of 0.62 and 0.73 V/m, respectively, which exceeded the thresholds for the X‐mode plasma and ion lines, while their intensity was 2 orders of magnitude less. For the same background conditions, the “classic” resonance parametric decay instability and modulation instability, excited as the momentary response to the O‐mode HF pump wave switching on (the so‐called overshoot), have thresholds of 0.17 and 0.25 V/m, respectively, which are much below the excitation thresholds of persistent O‐mode plasma and ion lines.

show abstract

Section: 1029/2020ja028203mentioning

confidence: 99%

Section: Journal Of Geophysical Research: Space Physicsmentioning

confidence: 99%

Distinctive Features of Langmuir and Ion‐Acoustic Turbulences Induced by O‐ and X‐Mode HF Pumping at EISCAT

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…The analysis of the entire volume of the CUTLASS data clearly demonstrated that the features and behaviors of the O-mode and X-mode artifi cial fi eld-aligned irregularities radically diff ered. There was also a signifi cant diff erence in the decay times for X-mode artifi cial fi eld-aligned irregularities excited at high ( 5 [37]. As seen, the artifi cial fi eld-aligned irregularity growth and decay times signifi cantly diff ered for O-and X-mode HF pumping.…”

Section: Small-scale Artifi Cial Field-aligned Irregularities (Afais)mentioning

confidence: 78%

“…The behavior and properties of artifi cial fi eld-aligned irregularities excited by the O-mode HF pump waves are well known (see, for example, [13][14][15] and references therein). The main attention is paid to the recently discovered artifi cial fi eld-aligned irregularities induced by the X-mode HF pump waves and their comparison with the O-mode artifi cial fi eld-aligned irregularities [31][32][33][34][35][36][37].…”

Section: Small-scale Artifi Cial Field-aligned Irregularities (Afais)mentioning

confidence: 99%

See 1 more Smart Citation

Perturbing the high-latitude upper ionosphere (F region) with powerful HF radio waves: A 25-year collaboration with EISCAT

Blagoveshchenskaya

2020

URSI Radio Sci. Bull.

Self Cite

View full text Add to dashboard Cite

Ion Gyro‐Harmonic Structures in Stimulated Emission Excited by X‐Mode High Power HF Radio Waves at EISCAT

et al. 2021

Self Cite

View full text Add to dashboard Cite

The distinctive features of the ion gyro‐harmonic discrete structures in the narrowband stimulated electromagnetic emission (NSEE) spectra (within ±1 kHz of the heater frequency), excited by an extraordinary (X‐mode) polarized high frequency (HF) pump wave in the F‐region of the high latitude ionosphere, are reported. Results were obtained from three sets of experiments at the EISCAT (European incoherent Scatter) HF Heating facility at pump frequencies of 5.423, 6.77 and 7.953 MHz, which are below the fourth, fifth, and sixth electron gyro‐harmonics. High power HF radio waves were radiated in the magnetic field‐aligned direction with an effective radiated power of 238–740 MW. Discrete spectral features, ordered by the ion gyro frequency (for O+ ions), were recorded at a large distance (1,200 km) away from the Heating facility. Up to 10 downshifted discrete ion gyro‐harmonic structures paired with the upshifted spectral components (Stokes and anti‐Stokes modes) in the NSEE spectra have been excited in the course of these experiments. It was found that preconditioning effects have a significant impact on the temporal evolution of the discrete spectral structures. The ion gyro‐harmonic structures coexisted with field‐aligned artificial irregularities (FAIs). Comparing the NSEE and EISCAT incoherent scatter radar observational results, it was concluded that the electron accelerations along and across the geomagnetic field coexist during X‐mode heating. The magnetized stimulated Brillouin scatter and stimulated ion Bernstein scatter are discussed as relevant processes for the observed multiple down‐ and upshifted ion gyro‐harmonic structures in the NSEE spectra.

show abstract

Characterization of Artificial, Small-Scale, Ionospheric Irregularities in the High-Latitude F Region Induced by High-Power, High-Frequency Radio Waves of Extraordinary Polarization

Cited by 11 publications

References 27 publications

Distinctive Features of Langmuir and Ion‐Acoustic Turbulences Induced by O‐ and X‐Mode HF Pumping at EISCAT

Distinctive Features of Langmuir and Ion‐Acoustic Turbulences Induced by O‐ and X‐Mode HF Pumping at EISCAT

Perturbing the high-latitude upper ionosphere (F region) with powerful HF radio waves: A 25-year collaboration with EISCAT

Ion Gyro‐Harmonic Structures in Stimulated Emission Excited by X‐Mode High Power HF Radio Waves at EISCAT

Contact Info

Product

Resources

About