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Updated: Jun 25, 2026

Hyperpolarized Xenon for NMR and MRI Applications
Published on: September 6, 2012
Radio pumping of ionospheric plasma with orbital angular momentum
T B Leyser1, L Norin, M McCarrick
1Swedish Institute of Space Physics, Box 537, SE-751 21 Uppsala, Sweden. thomas.leyser@irfu.se
Abstract:
Experimental results are presented of pumping ionospheric plasma with a radio wave carrying orbital angular momentum (OAM), using the High Frequency Active Auroral Research Program (HAARP) facility in Alaska. Optical emissions from the pumped plasma turbulence exhibit the characteristic ring-shaped morphology when the pump beam carries OAM. Features of stimulated electromagnetic emissions (SEE) that are attributed to cascading Langmuir turbulence are well developed for a regular beam but are significantly weaker for a ring-shaped OAM beam in which case upper hybrid turbulence dominates the SEE.
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