Enhancement of stimulated electromagnetic emission during two frequency ionospheric heating experiments

Paul A. Bernhardt; L. S. Wagner; J. A. Goldstein; V. Yu. Trakhtengerts; E. N. Ermakova; V. O. Rapoport; G. P. Komrakov; A. M. Babichenko

doi:10.1103/PhysRevLett.72.2879

Enhancement of stimulated electromagnetic emission during two frequency ionospheric heating experiments

Paul A. Bernhardt, L. S. Wagner, J. A. Goldstein, V. Yu. Trakhtengerts, E. N. Ermakova, V. O. Rapoport, G. P. Komrakov, and A. M. Babichenko

Phys. Rev. Lett. 72, 2879 – Published 2 May 1994

Abstract

We have discovered that stimulated electromagnetic emission (SEE), excited by a powerful electromagnetic (EM) wave (pump 1) in the ionosphere, can be enhanced by a second high power EM wave (pump 2) with a higher frequency. For frequency separations near 0.4 MHz, the downshifted SEE in a 40 kHz band below the frequency of pump 1 is increased by 2 dB when pump 2 is turned on. We theorize that a second EM wave generates plasma irregularities that facilitate the mode conversion of electrostatic waves to yield enhanced EM emissions from pump 1.

Received 16 August 1993

DOI:https://doi.org/10.1103/PhysRevLett.72.2879

Authors & Affiliations

Paul A. Bernhardt, L. S. Wagner, J. A. Goldstein, V. Yu. Trakhtengerts, E. N. Ermakova, V. O. Rapoport, G. P. Komrakov, and A. M. Babichenko

Plasma Physics Division, Naval Research Laboratory, Washington, D.C. 20375-5000
Information Technology Division, Naval Research Laboratory, Washington, D.C. 20375-5000
Institute of Applied Physics, Nizhniy Novgorod, Russia
Radiophysical Research Institute, Nizhniy Novgorod, Russia