Thermal parametric turbulence in a plasma

Грач, С. М.; Mityakov, N. A.; Rapoport, V. O.; Trakhtengertz, V.Yu.

doi:10.1016/0167-2789(81)90063-4

Cited by 43 publications

(40 citation statements)

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“…Upper-hybrid waves can also be generated through the linear mode conversion of the pump wave in the vicinity of existing density striations (Mishin et al, 2004(Mishin et al, , 2005. Upper hybrid wave trapping within the striations leads to ohmic heating, deepening of the striations, and thermal parametric instability (Grach et al, 1981;Dsythe et al, 1982). Subsequent wave growth leads to explosive growth through resonance instability (Vas'kov and Gurevich, 1977).…”

Section: Discussionmentioning

confidence: 99%

“…Artificial FAIs are generally believed to be generated by thermal parametric instabilities (TPIs) which form at altitudes slightly above the upper hybrid resonance height where the pump frequency is the Pythagorean sum of the plasma frequency and the electron gyrofrequency (Grach et al, 1977;Das and Fejer, 1979;Grach et al, 1981;Dsythe et al, 1982;Dsythe et al, 1983). In the nonlinear stage of evolution, the TPI goes over to the resonance instability developed by Gurevich (1975, 1977) and expanded upon by Inhester (1982).…”

Section: Discussionmentioning

confidence: 99%

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30 MHz radar observations of artificial E region field-aligned plasma irregularities

Hysell

2008

Ann. Geophys.

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Abstract. Artificial E region field aligned irregularities (FAIs) have been observed during heating experiments at the HAARP facility using a new 30 MHz coherent scatter radar imager deployed near Homer, Alaska. Irregularities were observed during brief experiments on three quiet days in July and August, 2007, when the daytime E region critical frequency was close to 3 MHz. Irregularities were consistently generated and detected during experiments with O-mode HF pumping on zenith with a 1-min on, 1-min off CW modulation. The scattering cross sections, rise, and fall times of the echoes were observed as well as their spectral properties. Results were found to be mainly in agreement with observations from other mid-and high-latitude sites with some discrepancies. Radar images of the irregularity-filled volume on one case exhibited clear variations in backscatter power and Doppler shift across the volume. The images furthermore show the emergence of a small irregularity-filled region to the south southwest of the main region in the approximate direction of magnetic zenith.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

30 MHz radar observations of artificial E region field-aligned plasma irregularities

Hysell

2008

Ann. Geophys.

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“…The FAIs we observe are understood to be produced at the upper-hybrid resonance height (Grach et al, 1977;Das and Fejer, 1979;Grach et al, 1981;Dysthe et al, 1982Dysthe et al, , 1983. On the basis of calculations outlined below, we expect Omode radiation from HAARP to penetrate to this height for both zenith and magnetic zenith pointing and to generate FAIs with roughly comparable characteristics in either case.…”

Section: Zenith and Magnetic Zenith Pointingmentioning

confidence: 99%

Radar observations of artificial E-region field-aligned irregularities

et al. 2009

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Abstract. Artificial E region field aligned plasma density irregularities (FAIs) were generated using HAARP in four different experimental modes and observed with a coherent scatter radar imager located 450 km to the southwest where it could detect field-aligned backscatter. The experiments were conducted in July of 2008, during the Polar Aeronomy and Radio Science Summer School (PARS), during quiet conditions in the daytime when the E layer was dense and absorption was modest. The echoes observed during zenith and magnetic zenith heating experiments were deflected from their nominally anticipated horizontal positions toward the midpoint position. The occurrence of hysteresis when heating with amplitude modulated pulses implied the development of the resonance instability, although the threshold for the onset of instability appeared to be higher than what has been predicted theoretically. Heating experiments involving pump frequencies slightly above and below the second electron gyroharmonic frequency produced no significant differences in the observed echoes. Finally, heating with a pump frequency slightly above the E region critical frequency appears to have produced FAIs at two distinct altitudes where the upper-hybrid resonance condition could be satisfied.

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“…Djuth et al, 1985;Noble et al, 1987) focuses attention on two closely related instability processes. One of these is the thermal parametric instability (Grach et al, 1978;Das and Fejer, 1979;Fejer, 1979;Kuo and Lee, 1982;Dysthe et al, 1983;Mjølhus, 1990), and the other is the resonance instability (Vas'kov and Gurevich, 1977;Inhester et al, 1981;Grach et al, 1981;Dysthe et al, 1982;Lee and Kuo, 1983;Mjølhus, 1993).…”

Section: Introductionmentioning

confidence: 99%

Artificial E-region field-aligned plasma irregularities generated at pump frequencies near the second electron gyroharmonic

Hysell

Nossa

2009

Ann. Geophys.

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Abstract. E region ionospheric modification experiments have been performed at HAARP using pump frequencies about 50 kHz above and below the second electron gyroharmonic frequency. Artificial E region field-aligned plasma density irregularities (FAIs) were created and observed using the imaging coherent scatter radar near Homer, Alaska. Echoes from FAIs generated with pump frequencies above and below 2 e did not appear to differ significantly in experiments conducted on summer afternoons in 2008, and the resonance instability seemed to be at work in either case. We argue that upper hybrid wave trapping and resonance instability at pump frequencies below the second electron gyroharmonic frequency are permitted theoretically when the effects of finite parallel wavenumbers are considered. Echoes from a sporadic E layer were observed to be somewhat weaker when the pump frequency was 50 kHz below the second electron gyroharmonic frequency. This may indicate that finite parallel wavenumbers are inconsistent with wave trapping in thin sporadic E ionization layers.

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Thermal parametric turbulence in a plasma

Cited by 43 publications

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30 MHz radar observations of artificial E region field-aligned plasma irregularities

30 MHz radar observations of artificial E region field-aligned plasma irregularities

Radar observations of artificial E-region field-aligned irregularities

Artificial E-region field-aligned plasma irregularities generated at pump frequencies near the second electron gyroharmonic

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