Stimulated Radiation from Strong Langmuir Turbulence in Ionospheric Modification

P. Y. Cheung; E. Mjølhus; D. F. DuBois; J. Pau; H. Zwi; A. Y. Wong

doi:10.1103/PhysRevLett.79.1273

Stimulated Radiation from Strong Langmuir Turbulence in Ionospheric Modification

P. Y. Cheung, E. Mjølhus, D. F. DuBois, J. Pau, H. Zwi, and A. Y. Wong

Phys. Rev. Lett. 79, 1273 – Published 18 August 1997

Abstract

New measurements of stimulated electromagnetic emissions (SEE) in low duty cycle heating experiments performed at the HIPAS Observatory are presented. Two distinct types of spectra, a weak diffuse type and a stronger type with deep frequency modulations, were observed. These results have been compared with numerical predictions from a 1D driven and damped Zakharov model and are found to be consistent with Langmuir collapse processes (strong spectra) and Langmuir turbulence of the coexistence type (weak spectra). Through this joint experimental and numerical study, evidence of strong Langmuir turbulence via SEE measurements has been demonstrated.

Received 2 May 1997

DOI:https://doi.org/10.1103/PhysRevLett.79.1273

Authors & Affiliations

P. Y. Cheung¹, E. Mjølhus², D. F. DuBois³, J. Pau¹, H. Zwi¹, and A. Y. Wong¹

¹Department of Physics and Astronomy, University of California, Los Angeles, California 90095
²Institute of Mathematical Sciences, University of Troms, N-9037 Tromso, Norway
³Lodestar Research Corporation, 2400 Central Avenue, Boulder, Colorado 80301