ELF generation in the lower ionosphere via collisional parametric decay

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https://onlinelibrary.wiley.com/doi/abs/10.1029/JA091iA09p10097

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https://doi.org/10.1029/JA091iA09p10097
 http://hdl.handle.net/11603/39036

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UMBC Computer Science and Electrical Engineering Department

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Author/Creator ORCID

https://orcid.org/0000-0003-0269-8433

Date

1986-09-01

Type of Work

journal articles
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Program

Citation of Original Publication

Ko, K., C. R. Menyuk, A. Reiman, V. Tripathi, P. Palmadesso, and K. Papadopoulos. "ELF Generation in the Lower Ionosphere via Collisional Parametric Decay". Journal of Geophysical Research: Space Physics 91, no. A9 (1986): 10097–107. https://doi.org/10.1029/JA091iA09p10097.

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Subjects

lower ionosphere
E region altitudes
ion cyclotron frequency
Manley-Rowe relations
stimulated parametric coupling
UMBC Optical Fiber Communications Laboratory
UMBC High Performance Computing Facility (HPCF)
ELF waves

Abstract

Generation of ELF waves by stimulated parametric coupling of two HF waves in the lower ionosphere is considered. In this region the nonlinear force is dominated by the thermal rather than the ponderomotive nonlinearity. It is shown that this results in lowering the pump threshold for complete decay by more than an order of magnitude while achieving efficiencies in excess of those expected on the basis of the Manley-Rowe relations. The lower-frequency mode excited for E region altitudes is the helicon mode, which continues to frequencies below the ion cyclotron frequency because ion-neutral collisions freeze the ion motion. The application of these results to ELF generation in the lower ionosphere, including power estimates for a proof of principle experiment, is discussed.