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Three‐dimensional saturation spectrum of the parametric decay instability
Author(s) -
Das A. C.,
Fejer J. A.,
Martinic N. J.
Publication year - 1985
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs020i004p00813
Subject(s) - physics , computational physics , saturation (graph theory) , earth's magnetic field , ionosphere , instability , magnetic field , polarization (electrochemistry) , electric field , parametric statistics , optics , geophysics , mechanics , mathematics , quantum mechanics , chemistry , statistics , combinatorics
The three‐dimensional saturation spectrum of the parametric decay instability is obtained numerically, taking the true polarization of the pump field into account. In previous works the pump electric field was taken to be parallel to the inclined geomagnetic field, although that condition is only satisfied generally by an ordinary (pump) wave if its frequency ω is equal to the plasma frequency ω p or if its propagation vector is perpendicular to the magnetic field. The spectrum obtained numerically for ω 0 = 1.04 ω p deviates strongly from axial symmetry about the geomagnetic field, especially for the large angle of inclination existing at Tromsø. The results obtained will therefore be important for the interpretation of the saturation spectrum observed with the aid of the EISCAT 933‐MHz UHF radar (which detects Langmuir waves for which ω 0 ∼ 1.04 ω p ) during ionospheric modification experiments near Tromsø.