Details

Autor(en) / Beteiligte

• Diaz, M. A.
• Oppenheim, M.
• Semeter, J. L.
• Zettergren, M.

Titel

Particle-in-cell simulation of incoherent scatter radar spectral distortions related to beam-plasma interactions in the auroral ionosphere

Ist Teil von

• Journal of Geophysical Research: Space Physics, 2011-01, Vol.116 (A1), p.n/a

Ort / Verlag

Blackwell Publishing Ltd

Erscheinungsjahr

2011

Quelle

Wiley Online Library - AutoHoldings Journals

Beschreibungen/Notizen

• An electrostatic parallel particle‐in‐cell (EPPIC) code that allows for particle beam injections and multiple boundary conditions is used to investigate the beam‐plasma interaction and its manifestations in the incoherent scatter (IS) spectrum. Specifically, the code is used to investigate anomalous enhancements in the ion acoustic line through the destabilization of the plasma by injection (or precipitation) of low‐energy electron beams. This enhancement of the ion acoustic line is a form of IS distortion commonly observed in the vicinity of auroral arcs called the naturally enhanced ion‐acoustic line (NEIAL). Simulations confirm the parametric decay of Langmuir waves as a plausible mechanism, assuming a mechanism for the formation of dense low‐energy (<10 eV) electron beams in the ionosphere. The spectral distortions are similar at aspect angles as large as ±15° from the beam direction. Simulations also show that the first Langmuir harmonic can have a power intensity higher than that of the ion acoustic line of a thermal plasma. Conditions which would allow the detection of Langmuir harmonics with existing incoherent scatter radars are discussed. Key Points Langmuir decay process is a feasible explanation to ion acoustic enhancements Langmuir harmonics may be detectable with current ISRs Langmuir harmonics may be useful to discriminate between explanations of NEIALs