Artificial Ionospheric GPS Phase Scintillation Excited During High‐Power Radiowave Modulation of the Ionosphere

Mahmoudian, A.; Scales, W. A.; Taylor, Steve; Morton, Yu; Bernhardt, P. A.; Briczinski, S. J.; Ghader, Sarmad

doi:10.1029/2017rs006517

Cited by 3 publications

(1 citation statement)

References 33 publications

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“…Milikh et al () observed the first experimental evidence of perturbations of GPS signals by the electron density irregularities caused by the HF ionospheric heating. Mahmoudian et al () show that the BUM emission dynamical evolution is closely linked to GPS scintillations produced during ionospheric heating. The characteristics and coupling of super small‐scale plasma irregularities with FAIs associated with BUM formation is the subject of our ongoing modeling work.…”

Section: Discussionmentioning

confidence: 99%

Asymmetry in Stimulated Emission Polarization and Irregularity Evolution During Ionospheric Electron Gyroharmonic Heating

Scales

Bernhardt

et al. 2018

Geophysical Research Letters

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The first report is made of a holistic investigation of stimulated electromagnetic emission (SEE) during ionospheric electron gyroharmonic heating using a diagnostic approach at the High Frequency Active Auroral Research Program facility. The evolution of SEE polarization and plasma irregularity development near the third electron gyroharmonic 3f ce is investigated, which provides new insights into SEE generation mechanisms by the associated parametric decay instabilities. New more complex SEE spectral line behavior is clearly observed for varying transmitter beam angles. New SEE spectral emissions are observed at ∼75 kHz when pumping below 3f ce . The high-frequency radar echoes and SEE polarimetry appear asymmetric for pumping above 3f ce , which implies that the broad upshifted maximum spectral line formation involves plasma irregularities scattered by high-frequency radar echoes. This has important implications for understanding artificial ionization layer generation during ionospheric modification.Plain Language Summary Nonlinear interaction of high-power electromagnetic waves and magnetized plasmas produces a plethora of fundamental phenomena that can be exploited for powerful diagnostics of the Earth's ionospheric plasma. Stimulated electromagnetic emissions (SEEs) and plasma density turbulence, observable with high-frequency radars, arise from this nonlinear interaction as well as artificial ionization layers. The later has received considerable attention recently due to the importance of the associated fundamental physics and chemistry processes as well as the implications for modern communication and navigation systems. Artificial ionization layers are still not well understood, and this work seeks to provide insight into the generation mechanism by reporting the first results of a novel diagnostic approach that utilizes SEE and high-frequency radar measurements. The experiments were performed at the High Frequency Active Auroral Research Program facility. The evolution of SEE polarimetry and turbulent plasma density structures exhibits a prominent asymmetry when sweeping the transmitter frequency near electron gyrohamonic frequencies. A direct connection was observed between the plasma density structures and SEE spectral lines known to be associated with ionization layers. The observed asymmetric behavior therefore provides new insights into the linkage between ionization layers and generation of plasma density structures with specific characteristics. , S. J. (2018). Asymmetry in stimulated emission polarization and irregularity evolution during ionospheric electron gyroharmonic heating. Geophysical Research Letters, 45,[9363][9364][9365][9366][9367][9368][9369][9370][9371]

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Section: Discussionmentioning

confidence: 99%

Asymmetry in Stimulated Emission Polarization and Irregularity Evolution During Ionospheric Electron Gyroharmonic Heating

Scales

Bernhardt

et al. 2018

Geophysical Research Letters

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Features of Turbulence Excited by Pulsed High-Frequency Pump in a Magnetoplasma

Zudin

Gushchin²,

Strikovskiy³

et al. 2022

Jetp Lett.

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Turbulence developed in a magnetoplasma modified by a high-power high-frequency pulse fed to a loop antenna is discovered and studied on the large-scale KROT plasma device. Turbulence is manifested in the excitation of the electron density and magnetic field pulsations, deep self-modulation of the pump wave, and modulation of probe waves passing through the modified plasma region. The space–time characteristics of turbulence are determined using correlated plasma density measurements by a pair of miniature microwave resonator probes and a magnetic probe. It is established that turbulence is excited only in the transparency band of the dense magnetoplasma to electromagnetic radiation: turbulent perturbations of the density and magnetic field exist during pumping at frequencies lower than the electron cyclotron frequency and are absent at pumping frequencies exceeding the electron cyclotron frequency.

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Characterization of multi-scale ionospheric irregularities using ground-based and space-based GNSS observations

et al. 2021

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Ionospheric irregularities can adversely affect the performance of Global Navigation Satellite System (GNSS). However, this opens the possibility of using GNSS as an effective ionospheric remote sensing tool. Despite ionospheric monitoring has been undertaken for decades, these irregularities in multiple spatial and temporal scales are still not fully understood. This paper reviews Virginia Tech’s recent studies on multi-scale ionospheric irregularities using ground-based and space-based GNSS observations. First, the relevant background of ionospheric irregularities and their impact on GNSS signals is reviewed. Next, three topics of ground-based observations of ionospheric irregularities for which GNSS and other ground-based techniques are used simultaneously are reviewed. Both passive and active measurements in high-latitude regions are covered. Modelling and observations in mid-latitude regions are considered as well. Emphasis is placed on the increased capability of assessing the multi-scale nature of ionospheric irregularities using other traditional techniques (e.g., radar, magnetometer, high frequency receivers) as well as GNSS observations (e.g., Total-Electron-Content or TEC, scintillation). Besides ground-based observations, recent advances in GNSS space-based ionospheric measurements are briefly reviewed. Finally, a new space-based ionospheric observation technique using GNSS-based spacecraft formation flying and a differential TEC method is demonstrated using the newly developed Virginia Tech Formation Flying Testbed (VTFFTB). Based on multi-constellation multi-band GNSS, the VTFFTB has been developed into a hardware-in-the-loop simulation testbed with external high-fidelity global ionospheric model(s) for 3-satellite formation flying, which can potentially be used for new multi-scale ionospheric measurement mission design.

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Artificial Ionospheric GPS Phase Scintillation Excited During High‐Power Radiowave Modulation of the Ionosphere

Cited by 3 publications

References 33 publications

Asymmetry in Stimulated Emission Polarization and Irregularity Evolution During Ionospheric Electron Gyroharmonic Heating

Asymmetry in Stimulated Emission Polarization and Irregularity Evolution During Ionospheric Electron Gyroharmonic Heating

Features of Turbulence Excited by Pulsed High-Frequency Pump in a Magnetoplasma

Characterization of multi-scale ionospheric irregularities using ground-based and space-based GNSS observations

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