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 Oceanography and Atmospheric Sci. Atmospheric Physics |
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Active Ionospheric Generation on ELF/VLF Waves
Authors: K. Papadopoulos; C. Chang; K. Ko; SCIENCE APPLICATIONS INC MCLEAN VA |
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Abstract: Our work during the past year on active ELF/VLF generation has produced major breakthroughs in the understanding of nonlinear interactions in a dissipating medium such as the ionosphere for the purpose of downconverting H.F. to ELF/VLF waves. A key result was the fact that the contrary to the conventional understanding of such processes, the presence of a dissipative medium lowers the threshold for complete decay and increases the downconversion efficiency over the one expected on the basis of the Manley rowe relations. Two codes were developed and optimized. (I) The first code named CMPOWER required as input a model of the ionospheric electron density and magnetic field, and the transmitter characteristics. It's output is the ELF/VLF signal as a function of the modulation frequency and distance from the HF facility. (II) The second named TWC (three wave coupling) is a nonlinear code, which includes dissipation and finite pump size effects. (Author)
| Description: |
Final rept. 23 Oct 82-22 Dec 83 |
| Pages: |
31 |
| Report Date: |
09 JAN 1984 |
| Contract Number: |
N00014-83-C-2019 |
| Report Number: |
A713931 |
Report Unavailable |
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