volume | PIER Journals

Abstract

We present a computational framework for the multispectral synthesis of optical emissions in Transient Luminous Events (TLEs), specifically sprites, based on plasma fluid simulations obtained with the Afivo Streamer tool. Using the simulated electric field and electron density, we compute quasi-stationary excitation, quenching, and radiative emission rates for four key spectral bands: first positive 1PN₂ and second positive 2PN₂ band systems of nitrogen, Lyman-Birge-Hopfield (LBH) band system, and Optical emission images OI (Ionized Atomic Oxygen) at 777.4 nm (OI 777.4 nm). The model incorporates electron-impact excitation coefficients k(E/N), non-radiative losses due to collisional quenching Q = Σ_iα_in_i, and atmospheric attenuation (especially relevant for LBH). It also produces 2D emission maps and vertical brightness profiles, showing the spatial localization of each band as a function of the reduced electric field, electron density, and non-radiative losses. The results capture the temporal evolution of the discharge, from the early propagation phase to advanced branching, enabling direct comparisons with spaceborne instrumentation (e.g., ASIM). The developed scheme provides a reproducible diagnostic tool that links plasma physical variables with observed signals across multiple spectral bands.

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Mr. Carlos Antonio Gómez Vargas

Dr. Francisco José Román Campos