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Incidence angle dependence of Langmuir turbulence and artificial ionospheric layers driven by high-power HF-heating

Part of: Invited Contributions from IOP Conference

Published online by Cambridge University Press:  06 November 2014

B. Eliasson ,
G. Milikh ,
X. Shao ,
E. V. Mishin  and
K. Papadopoulos
B. Eliasson*
Affiliation:
Departments of Physics and Astronomy, University of Maryland, College Park, Maryland, USA SUPA, Physics Department, University of Strathclyde, Glasgow, Scotland, UK
G. Milikh
Affiliation:
Departments of Physics and Astronomy, University of Maryland, College Park, Maryland, USA
X. Shao
Affiliation:
Departments of Physics and Astronomy, University of Maryland, College Park, Maryland, USA
E. V. Mishin
Affiliation:
Space Vehicles Directorate, Air Force Research Laboratory, Kirtland AFB, Albuquerque, NM, USA
K. Papadopoulos
Affiliation:
Departments of Physics and Astronomy, University of Maryland, College Park, Maryland, USA
*
†Email address for correspondence: bengt.eliasson@strath.ac.uk
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Abstract

We have numerically investigated the development of strong Langmuir turbulence (SLT) and associated electron acceleration at different angles of incidence of ordinary (O) mode pump waves. For angles of incidence within the Spitze cone, the turbulence initially develops within the first maximum of the Airy pattern near the plasma resonance altitude. After a few milliseconds, the turbulent layer shifts downwards by about 1 km. For injections outside the Spitze region, the turning point of the pump wave is at lower altitudes. Yet, an Airy-like pattern forms here, and the turbulence development is quite similar to that for injections within the Spitze. SLT leads to the acceleration of 10–20 eV electrons that ionize the neutral gas thereby creating artificial ionospheric layers. Our numerical modeling shows that most efficient electron acceleration and ionization occur at angles between the magnetic and geographic zenith, where SLT dominates over weak turbulence. Possible effects of the focusing of the electromagnetic beam on magnetic field-aligned density irregularities and the finite heating beam width at the magnetic zenith are also discussed. The results have relevance to ionospheric heating experiments using ground-based, high-power radio transmitters to heat the overhead plasma, where recent observations of artificial ionization layers have been made.

Type
Research Article
Information
Journal of Plasma Physics , Volume 81 , Issue 2 , April 2015 , 415810201
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Copyright
Copyright © Cambridge University Press 2014 

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References

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