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Laboratory reproduction of arecibo experimental results: HF wave‐enhanced Langmuir waves
Author(s) -
Lee M. C.,
Riddolls R. J.,
Vilece K. D.,
Dalrymple N. E.,
Rowlands M. J.,
Moriarty D. T.,
Groves K. M.,
Sulzer M. P.,
Kuo S. P.
Publication year - 1997
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/96gl03886
Subject(s) - langmuir turbulence , langmuir , plasma oscillation , physics , computational physics , spectral line , atomic physics , optics , plasma , chemistry , astronomy , aqueous solution , quantum mechanics
Laboratory experiments at MIT using the Versatile Toroidal Facility (VTF) have produced “cascading” and “frequency‐upshifted” spectra of HF wave‐enhanced Langmuir waves resembling the spectra observed in Arecibo experiments. The VTF experiments are well‐explained using the source mechanism proposed by Kuo and Lee [1992] to interpret observed Langmuir wave spectra at Arecibo, Puerto Rico. This mechanism is referred to as a nonlinear scattering of parametric decay instability (PDI)‐excited Langmuir waves by “pre‐existing” lower hybrid waves to preferentially produce anti‐Stokes (i.e., frequency‐upshifted) Langmuir waves. Recent radar spectral observations of anti‐Stokes Langmuir waves at Arecibo with improved range and time resolution [Sulzer and Fejer, 1994] can be reasonably understood in terms of this mechanism.