Ionospheric Scintillation Data Inversion to Characterize the Structures Associated With a Series of Polar Cap Patches

Conroy, James P.; Deshpande, K.; Kunduri, B.; Varney, R. H.; Scales, W. A.; Zaghloul, Amir I.

doi:10.1029/2020rs007235

Cited by 3 publications

(2 citation statements)

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“…The anisotropy parameters α and β have a rich morphology. At high latitudes one has observed the rod-like structures (α ≈ 5 − 10, β ≈ 1) that are elongated along the geomagnetic field lines (Rino et al, 1978;Sunanda Basu et al, 1991;Wang & Morton, 2017;Conroy et al, 2021). Additionally to these structures, the wing-(α ≈ 10−15, β ≈ 5) and sheet-like (α ≈ β ≈ 10) structures might appear near the exit of the polar convection channel (Rino & Owen, 1980;Rino et al, 1983;Conroy et al, 2021).…”

Section: Geometric Enhancement Of Scintillationmentioning

confidence: 97%

“…At high latitudes one has observed the rod-like structures (α ≈ 5 − 10, β ≈ 1) that are elongated along the geomagnetic field lines (Rino et al, 1978;Sunanda Basu et al, 1991;Wang & Morton, 2017;Conroy et al, 2021). Additionally to these structures, the wing-(α ≈ 10−15, β ≈ 5) and sheet-like (α ≈ β ≈ 10) structures might appear near the exit of the polar convection channel (Rino & Owen, 1980;Rino et al, 1983;Conroy et al, 2021). The midlatitude irregularities are primarily field-aligned of the rod-type, α ≈ 6, β ≈ 1, (Moorcroft & Arima, 1972) (Lay et al, 2018), while the Perkin instability might also form the sheetlike structures (MacDougall & Eadie, 2005).…”

Section: Geometric Enhancement Of Scintillationmentioning

confidence: 99%

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Anisotropic scintillation indices for weak scattering regime

Vasylyev

Béniguel

Wilken

et al. 2022

Preprint

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Transionospheric radio signals might undergo random modulations of their amplitude and phase caused by scattering on irregular structures in the ionosphere. This phenomenon, known as scintillation, is governed by the space weather conditions, time of the day, season, local distribution of the geomagnetic field, etc. All these factors make ionospheric scintillation both highly variable in space and time. Moreover, scintillation are intrinsically anisotropic since the associated scattering irregularities tend to align and stretch along the geomagnetic field lines. Depending on the relative position of signal source, the receiving station, and the irregularity, the scintillation effect on the transmitted wave might be enhanced or reduced. This study is focused on the consistent accounting of this geometric effect in scintillation modeling with the emphasis on situations when the communication or sensing sender-receiver link is nearly horizontal. For this task the single phase screen model has been used to model the scattering of propagating radio signals on random ionospheric layer. The geometric enhancement effect of scintillation is demonstrated by considering communication links via a geostationary beacon satellite over the equator.

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Section: Geometric Enhancement Of Scintillationmentioning

confidence: 97%

Section: Geometric Enhancement Of Scintillationmentioning

confidence: 99%

Anisotropic scintillation indices for weak scattering regime

Vasylyev

Béniguel

Wilken

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

Anisotropic ionospheric scintillation in weak scattering regime

Vasylyev,

Béniguel,

Wilken

et al. 2024

Advances in Space Research

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Morphological and Spectral Features of Ionospheric Structures at E- and F-Region Altitudes over Poker Flat Analyzed Using Modeling and Observations

Vaggu

Deshpande

Datta‐Barua

et al. 2023

Sensors

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Electron density irregularities in the ionosphere modify the phase and amplitude of trans-ionospheric radio signals. We aim to characterize the spectral and morphological features of E- and F-region ionospheric irregularities likely to produce these fluctuations or “scintillations”. To characterize them, we use a three-dimensional radio wave propagation model—“Satellite-beacon Ionospheric scintillation Global Model of upper Atmosphere” (SIGMA), along with the scintillation measurements observed by a cluster of six Global Positioning System (GPS) receivers called Scintillation Auroral GPS Array (SAGA) at Poker Flat, AK. An inverse method is used to derive the parameters that describe the irregularities by estimating the best fit of model outputs to GPS observations. We analyze in detail one E-region and two F-region events during geomagnetically active times and determine the E- and F-region irregularity characteristics using two different spectral models as input to SIGMA. Our results from the spectral analysis show that the E-region irregularities are more elongated along the magnetic field lines with rod-shaped structures, while the F-region irregularities have wing-like structures with irregularities extending both along and across the magnetic field lines. We also found that the spectral index of the E-region event is less than the spectral index of the F-region events. Additionally, the spectral slope on the ground at higher frequencies is less than the spectral slope at irregularity height. This study describes distinctive morphological and spectral features of irregularities at E- and F-regions for a handful of cases performed using a full 3D propagation model coupled with GPS observations and inversion.

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Ionospheric Scintillation Data Inversion to Characterize the Structures Associated With a Series of Polar Cap Patches

Cited by 3 publications

References 50 publications

Anisotropic scintillation indices for weak scattering regime

Anisotropic scintillation indices for weak scattering regime

Anisotropic ionospheric scintillation in weak scattering regime

Morphological and Spectral Features of Ionospheric Structures at E- and F-Region Altitudes over Poker Flat Analyzed Using Modeling and Observations

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