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Phys. Rev. Lett. 102, 065004 (2009) [4 pages]

Radio Pumping of Ionospheric Plasma with Orbital Angular Momentum

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T. B. Leyser1,*, L. Norin2, M. McCarrick3, T. R. Pedersen4, and B. Gustavsson5
1Swedish Institute of Space Physics, Box 537, SE-751 21 Uppsala, Sweden
2Department of Physics and Astronomy, Uppsala University, Box 515, Uppsala SE-751 20, Sweden
3BAE SYSTEMS Advanced Technologies, 1250 24th St, NW, Suite 850, Washington, D.C., USA
4Air Force Research Laboratory, Hanscom Air Force Base, Massachusetts 01731, USA
5Department of Physics and Technology, University of Tromsø, N-9037 Tromsø, Norway

Received 8 October 2008; published 12 February 2009

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.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.065004
DOI:
10.1103/PhysRevLett.102.065004
PACS:
94.20.Tt, 52.25.Os, 52.40.−w, 95.85.Bh

*thomas.leyser@irfu.se

 
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