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Radio Pumping of Ionospheric Plasma with Orbital Angular Momentum

2009; American Physical Society; Volume: 102; Issue: 6 Linguagem: Inglês

10.1103/physrevlett.102.065004

1092-0145

T. B. Leyser, Lars Norin, M. McCarrick, T. R. Pedersen, B. Gustavsson,

Optical Wireless Communication Technologies

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.