Investigation of the spatial structure and developmental dynamics of near-Earth plasma perturbations under the action of
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TICAL, NONLINEAR, AND SOFT MATTER PHYSICS
Investigation of the Spatial Structure and Developmental Dynamics of Near-Earth Plasma Perturbations under the Action of Powerful HF Radio Waves A. S. Belov Lobachevsky Nizhny Novgorod State University, pr. Gagarina 23, Nizhny Novgorod, 603950 Russia e-mail: [email protected] Received March 28, 2015
Abstract—Results of numerical simulations of the near-Earth plasma perturbations induced by powerful HF radio waves from the SURA heating facility are presented. The simulations were performed using a modified version of the SAMI2 ionospheric model for the input parameters corresponding to the series of in-situ SURA–DEMETER experiments. The spatial structure and developmental dynamics of large-scale plasma temperature and density perturbations have been investigated. The characteristic formation and relaxation times of the induced large-scale plasma perturbations at the altitudes of the Earth’s outer ionosphere have been determined. DOI: 10.1134/S1063776115100052
1. INTRODUCTION A continuous increase in the number of transmitters and repeaters leads to a significant growth of the technogenic electromagnetic load on the environment. This necessitates a timely detection, control, and understanding of the processes in near-Earth space attributable to electromagnetic effects. The most effective method that allows regular studies of the near-Earth plasma with controllable parameters of the effect to be carried out is ionospheric heating by powerful HF radio waves from special facilities. The effect of powerful HF radio waves with Opolarization on the ionospheric F-region can lead to significant perturbations not only in the pump-wave reflection region but also over the entire thickness of the ionosphere. The previously obtained experimental results on the effect of powerful HF radio waves on the nearEarth plasma allowed the plasma-wave perturbation parameters in the lower ionosphere, below the main ionization maximum, to be determined [1]. At the same time, the perturbation characteristics above the F-region remain comparatively poorly studied. In-situ measurements using the onboard equipment of artificial Earth satellites have provided information only about the local characteristics of turbulence at the altitudes of the outer ionosphere [2–4]. In contrast, measurements with high spatial (in altitude, latitude, and longitude) and temporal resolutions,
which are impossible at present, are required to determine the spatial structure and developmental dynamics of artificial ionospheric turbulence over the entire thickness of the ionosphere. This necessitates performing numerical simulations of the processes related to the interaction of powerful HF radio waves with the near-Earth plasma. In this paper, using a modified version of the open code of the SAMI2 two-dimensional ionospheric model (Sami2 is another Model of the Ionosphere), we investigated the spatial structure and temporal characteristics of the development and relaxation of the perturbations produced under the action
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