Full-scale simulation study of a generalized Zakharov model for the generation of topside ionospheric turbulence

TL;DR

This paper uses full-scale simulations of a generalized Zakharov model to investigate how ionospheric heating induces topside electrostatic turbulence through complex wave interactions and parametric decay processes.

Contribution

It introduces a comprehensive simulation framework for modeling the generation of topside ionospheric turbulence via a generalized Zakharov model, highlighting nonlinear wave tunneling and mode conversion mechanisms.

Findings

Electromagnetic waves undergo nonlinear tunneling through the ionosphere.

Parametric decay cascades generate topside electrostatic turbulence.

Conversion processes allow waves to escape the plasma.

Abstract

We present a full-scale simulation study of a generalized Zakharov model for the generation of the topside electrostatic turbulence due to the parametric instability during ionospheric heating experiments near the F region peak. The nonlinear tunneling of electromagnetic waves through the ionospheric layer is attributed to multiple-stage parametric decay and mode-conversion processes. At the bottomside of the F region, electrostatic turbulence excited by the parametric instability results in the conversion of the ordinary (O mode) wave into a large amplitude extraordinary (Z mode) wave tunneling through the F peak. At the topside interaction region, the Z mode undergoes parametric decay cascade process that results in the generation of the topside electrostatic turbulence and then conversion process yielding O waves that escape the plasma. This study may explain the observed topside ionospheric turbulence during ground based ionospheric heating experiments.