Electron gyroharmonic effects on ionospheric stimulated Brillouin scatter
Article first published online: 21 AUG 2014
©2014. American Geophysical Union. All Rights Reserved.
Geophysical Research Letters
Volume 41, Issue 16, pages 5710–5716, 28 August 2014
How to Cite
2014), Electron gyroharmonic effects on ionospheric stimulated Brillouin scatter, Geophys. Res. Lett., 41, 5710–5716, doi:10.1002/2014GL061050., , , , , , , and (
- Issue published online: 29 SEP 2014
- Article first published online: 21 AUG 2014
- Accepted manuscript online: 11 AUG 2014 04:07AM EST
- Manuscript Accepted: 2 AUG 2014
- Manuscript Revised: 31 JUL 2014
- Manuscript Received: 30 JUN 2014
- ARO. Grant Numbers: W911NF-11-0217, W911NF-10-1-0002
- stimulated electromagnetic emissions
Stimulated Brillouin scattering (SBS) and resonant phenomena are well known in the context of laser fusion, fiber optics, and piezoelectric semiconductor plasmas, as well as in various biological applications. Due to recent advances, active space experiments using high-power high-frequency (HF) radio waves may now produce stimulated Brillouin scattering (SBS) in the ionospheric plasma. The sensitivity of the narrowband SBS emission lines to pump frequency stepping across electron gyroharmonics is reported here for the first time. Experimental observations show that SBS emission sidebands are suppressed as the HF pump frequency is stepped across the second and third electron gyroharmonics. A correlation of artificially enhanced airglow and SBS emission lines excited at the upper hybrid altitude is observed and studied for second gyroharmonic heating. The SBS behavior near electron gyroharmonics is shown to have important diagnostic applications for multilayered, multi-ion component plasmas such as the ionosphere.