Laboratory reproduction of arecibo experimental results: HF wave‐enhanced Langmuir waves

Lee, M. C.; Riddolls, R.J.; Vilece, K.D.; Dalrymple, N.; Rowlands, Michael; Moriarty, D.T.; Groves, K. M.; Sulzer, M. P.; Kuo, Spencer

doi:10.1029/96gl03886

Cited by 11 publications

(5 citation statements)

References 12 publications

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“… Lee et al [1997] and Kuo and Lee [1999] dispute the existence of cavitons. They argue that most of the observed spectral structure can be interpreted as nonlinear scattering of parametric decay instability‐excited Langmuir waves by “preexisting” lower hybrid waves.…”

Section: Introductionmentioning

confidence: 99%

First 100 ms of HF modification at Tromsø, Norway

et al. 2004

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[1] Experiments were performed with the high-power, high-frequency (HF) facility at Tromsø, Norway to test theoretical predictions for the excitation of ion and Langmuir oscillations in the ionosphere. The principal diagnostic of wave-plasma interactions was the VHF radar at the European Incoherent Scatter (EISCAT) facility. This radar is collocated with the HF facility. High-resolution radar techniques were used to monitor the temporal development of the ion and Langmuir oscillations. HF pulses 100 ms in duration were periodically transmitted into a smooth background F region plasma. Measurements of the radar backscatter spectra show that all key spectral features predicted by strong Langmuir turbulence theory are simultaneously present in the plasma and that their evolution is in agreement with theoretical expectations. However, several new features have been observed that are not anticipated by current theory. The experimental results reinforce the notion that new theoretical developments are needed to accommodate the large HF electric fields produced at Tromsø and treat the electron acceleration process in a self-consistent fashion.

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Section: Introductionmentioning

confidence: 99%

First 100 ms of HF modification at Tromsø, Norway

et al. 2004

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“…To better connect to the theoretical model, some laboratory experiments are designed to include diverging or otherwise inhomogeneous magnetic field geometries found in the space context [ Stenzel et al , 1980; Ferron et al , 1983; Alport et al , 1986; Zintl et al , 1995; Gunell et al , 1996; Warren and Mauel , 1999; Yamada , 1999; Vincena et al , 2001]; some experiments use a solenoidal field [ Rynn and D'Angelo , 1960; Gekelman and Stenzel , 1975a; Alport et al , 1990; Gekelman et al , 1991b]; and some high‐temperature plasma experiments use toroidal fields [ Scime et al , 1992; al‐Karkhy et al , 1993; Ji et al , 1994; Prasad et al , 1994; Lee et al , 1997]. Within a few Earth radii the Earth's magnetic field is dipolar, having a magnitude that is inversely proportional to the cube of the radial distance.…”

Section: Utility Of Laboratory Devices For Investigating Space Phenomenamentioning

confidence: 99%

“…A milestone in the interrelationship between laboratory and space experiments is the appearance of papers that include both space data and laboratory data [ Lee et al , 1997; Sheldon and Spurrier , 2001; Kelley et al , 2002]. Using data from the Freja satellite and a Q machine, Hamrin et al [2001] support their conclusion that perpendicular velocity shear contributes to the excitation of broadband extremely low‐frequency waves in the auroral ionosphere.…”

Section: Interdisciplinary Activitiesmentioning

confidence: 99%

Interrelated laboratory and space plasma experiments

Koepke

2008

Reviews of Geophysics

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[1] Many advances in understanding space plasma phenomena have been linked to insight derived from theoretical modeling and/or laboratory experiments. Advances for which laboratory experiments played an important role are reviewed here. How the interpretation of the space plasma data was influenced by one or more laboratory experiments is described. The space physics motivation of laboratory investigations and the scaling of laboratory plasma parameters to space plasma conditions are discussed. Examples demonstrating how laboratory experiments develop physical insight, validate or invalidate theoretical models, discover unexpected behavior, establish observational signatures, and pioneer diagnostic methods for the space community are presented. The various device configurations found in space-related laboratory investigations are outlined. A primary objective of this review is to articulate the overlapping scientific issues that are addressable in space and laboratory experiments. A secondary objective is to convey the wide range of laboratory and space plasma experiments involved in this interdisciplinary alliance. Over time the degree to which the interrelated experiments can be compared has increased, thanks to improved diagnostic techniques in space and closer attention to matching dimensionless space parameters in the laboratory.

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“…Excitation of parametric instabilities in ionospheric HF heating experiments [e.g., Fejer and Kuo , 1973; Perkins et al , 1974; Fejer , 1979; Kuo et al , 1983, 1993; Kuo , 1996; Lee and Kuo , 1983; Stenflo , 1990] is evidenced directly by radar observations of plasma lines and ion lines [ Carlson et al , 1972; Showen and Kim , 1978; Showen and Behnke , 1978; Hagfors et al , 1983; Stubbe et al , 1992; Westman et al , 1995; Lee et al , 1997, 1998, 1999; Rietveld et al , 2000] and indirectly by the physical interpretations [ Stubbe et al , 1984; Stenflo , 2004] of the ground measurements of stimulated electromagnetic emissions (SEEs) [ Thide et al , 1982; Stubbe et al , 1984, 1994], as well as laboratory simulations [ Lee et al , 1997].…”

Section: Introductionmentioning

confidence: 99%

Cascade spectrum of HF enhanced plasma lines generated in HF heating experiments

Kuo¹,

Lee

2005

J. Geophys. Res.

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[1] Analyzed in this paper is the cascade spectrum of Langmuir waves, which are the high-frequency sideband of the parametric decay instability or oscillating two-stream instability excited by an O mode HF heating wave. It involves the decay of a Langmuir pump wave into a Langmuir sideband and an ion acoustic wave, which is heavily damped by ion Landau damping. Both resonant and nonresonant cascade processes are considered. The nonresonant cascade of Langmuir waves proceeds at the same location and is severely hampered by the frequency mismatch effect, because the decay wave is a driven ion mode oscillating at considerably lower frequency than that of the ion acoustic wave. In contrast, the resonant cascade, which takes place at different resonant locations to minimize the frequency mismatch effect, has to overcome the propagation loss of the mother Langmuir wave in each cascade step. The resonant cascade has a lower threshold, but the cascade lines spread over a range of altitude. The dominant factors, which determine the number of cascade lines in the radar-detected spectrum of HF enhanced plasma lines (HFPLs), include the ion to electron temperature ratio, T i /T e , the background plasma inhomogeneity scale length, and the heating wave field intensity. The proposed process can be a reasonable basis for explaining the radar-measured cascade spectrum of Langmuir waves (i.e., HFPLs) in Arecibo and Tromso heating experiments.Citation: Kuo, S. P., and M. C. Lee (2005), Cascade spectrum of HF enhanced plasma lines generated in HF heating experiments,

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Laboratory reproduction of arecibo experimental results: HF wave‐enhanced Langmuir waves

Abstract: Abstract. Laboratory experiments at M1T using the Versatile Toroidal Facility (VTF) have produced "cascading" and "frequency-upshifted" spectra of HF wave-enhanced Lungmuir waves resembling the spectra observed in Arecibo experiments. The VTF experiments are well-explained using

Cited by 11 publications

References 12 publications

First 100 ms of HF modification at Tromsø, Norway

First 100 ms of HF modification at Tromsø, Norway

Interrelated laboratory and space plasma experiments

Cascade spectrum of HF enhanced plasma lines generated in HF heating experiments

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