Plasma parameter analysis of the Langmuir decay process via Particle-in-Cell simulations

摘要: Abstract. The beam-plasma mechanism, based on the Langmuir decay process, has been proposed to explain naturally enhanced ion-acoustic lines (NEIALs), which are spectral distortions in incoherent scatter radar (ISR) data frequently observed vicinity of auroral arcs. In this work effect process ISR spectrum is studied and compared with an analytical model for different plasma parameters by using electrostatic parallel particle-in-cell (EPPIC) code. Simulations show that code working accordance theory a wide range beam values features sensitive changes those values. These results suggest EPPIC might be used build spectrum-plasma parameter will allow estimation from spectra. also confirm background electron density (ne) plays important role determining maximum detectable wavenumber enhancement. Specifically, demonstrate increase ne makes enhancements ion acoustic more likely line at large wavenumbers, finding consistent statistical studies showing frequent NEIAL occurrence near solar maximum. Finally, simulations expose some inaccuracies current theoretical quantifying energy passed waves as well wavenumbers. differences may attributable weak turbulent regime assumption theory.