Study of Ionospheric Bending Angle and Scintillation Profiles Derived by GNSS Radio-Occultation with MetOp-A Satellite

Prol, Fabricio dos Santos; Hoque, Mainul; Hernández‐Pajares, Manuel; Yuan, Liangliang; Olivares‐Pulido, Germán; Engeln, Axel von; Marquardt, Christian; Notarpietro, Riccardo

doi:10.3390/rs15061663

Cited by 5 publications

(8 citation statements)

References 55 publications

(66 reference statements)

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“…A comprehensive quality assessment of the bending angle, amplitude, and phase scintillation profiles generated at EUMETSAT is conducted by comparing MetOp-A data against independent measurements. This analysis has been recently summarized and published [9], and a details analysis of the results is out of the scope of the current paper. A comprehensive quality assessment of the bending angle, amplitude, and phase scintillation profiles generated at EUMETSAT is conducted by comparing MetOp-A data against independent measurements.…”

Section: Assessment Of Bending Angle Profilesmentioning

confidence: 99%

Section: Assessment Of Bending Angle Profilesmentioning

confidence: 99%

“…It is noted that the MetOp-A satellite passes the Northern middle latitudes at around 6:00 and 18:00 local time (LT) hours, where and when the sporadic E-layers (Es) are more evident [9]. A literature study shows that the mid-latitude Es is visible only during summertime (being the highest during local noon hours) ( [9] and references therein). Such scintillation occurs only at E-layer height (80-140 km).…”

Section: Assessment Of Scintillation Indices Profilesmentioning

confidence: 99%

“…It seems that COSMIC-2 shows weaker scintillation due to the favorable ray path geometry (neither meridional direction nor zonal direction rather falls between the two). For more details of the assessment results regarding the quality of MetOp-A scintillations products, we refer to [9].…”

Section: Assessment Of Scintillation Indices Profilesmentioning

confidence: 99%

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Assessment of GRAS Ionospheric Measurements for Ionospheric Model Assimilation

et al. 2023

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We conducted a study to assess the GNSS (Global Navigation Satellite System) Receiver for Atmospheric Sounding (GRAS) ionospheric data quality by processing Radio Occultation (RO) observations of ionospheric products. The main objective of the study is to validate ionospheric data generated at EUMETSAT, such as ionospheric bending angle profiles, amplitude and phase scintillations, topside Total Electron Content (TEC) from MetOp-A GRAS instrument as well as generating and validating new ionospheric products derived from GRAS RO observations such as the TEC, rate of TEC and vertical electron density profiles. The assessment is conducted by comparing and evaluating the systematic differences between similar products from other Low Earth Orbit (LEO) satellite missions or from ground-based ionospheric measurements. The study confirms that the GNSS topside and RO observations recorded by the GRAS instrument onboard MetOp satellites are of good quality and are a valuable source of data for ionospheric research.

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Section: Assessment Of Bending Angle Profilesmentioning

confidence: 99%

Section: Assessment Of Bending Angle Profilesmentioning

confidence: 99%

Section: Assessment Of Scintillation Indices Profilesmentioning

confidence: 99%

Section: Assessment Of Scintillation Indices Profilesmentioning

confidence: 99%

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Assessment of GRAS Ionospheric Measurements for Ionospheric Model Assimilation

et al. 2023

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“…Using ground-based observations alone, with their inadequate geometry for capturing vertical ionospheric structures, leads to models with limited resolution and accuracy. The addition of RO data complements ground-based measurements by enhancing vertical resolution and expanding coverage, especially in the upper layers of the ionosphere [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

IONOLAB-Fusion: Fusion of Radio Occultation into Computerized Ionospheric Tomography

Yenen,

Arikan

2024

Atmosphere

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In this study, a 4-D, computerized ionospheric tomography algorithm, IONOLAB-Fusion, is developed to reconstruct electron density using both actual and virtual vertical and horizontal paths for all ionospheric states. The user-friendly algorithm only requires the coordinates of the region of interest and range with the desired spatio-temporal resolutions. The model ionosphere is formed using spherical voxels in a lexicographical order so that a 4-D ionosphere can be mapped to a 2-D matrix. The model matrix is formed automatically using a background ionospheric model with an optimized retrospective or near-real time manner. The singular value decomposition is applied to extract a subset of significant singular values and corresponding signal subspace basis vectors. The measurement vector is filled automatically with the optimized number of ground-based and space-based paths. The reconstruction is obtained in closed form in the least squares sense. When the performance of IONOLAB-Fusion across Europe was compared with ionosonde profiles, a 26.51% and 32.33% improvement was observed over the background ionospheric model for quiet and disturbed days, respectively. When compared with GIM-TEC, the agreement of IONOLAB-Fusion was 37.89% and 31.58% better than those achieved with the background model for quiet and disturbed days, respectively.

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PlanetiQ Radio Occultation: Preliminary Comparative Analysis of Neutral Profiles vs. COSMIC and NWP Models

Ahmed,

Alheyf,

Yamany

2024

Preprint

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Radio Occultation (RO) is pivotal for profiling the neutral and ionized atmosphere, with the PlanetiQ mission, via its GNOMES satellites, striving to establish an advanced atmospheric observing system. However, an assessment of the spatiotemporal distributions of PlanetiQ observations and comparisons with reliable datasets are lacking. This study addresses this gap by examining the temporal and spatial distribution of RO observations from PlanetiQ during its initial 198 operational days in 2023, alongside comparisons with COSMIC and Numerical Weather Prediction (NWP) models. Data from GN02, GN03, and GN04 satellites, yielding 1099, 1313, and 1843 RO events per day respectively, were analyzed. The satellite constellation's observations demonstrate a generally well-distributed pattern, albeit minor deficiencies in equatorial and polar regions. Single-profile comparisons with COSMIC data reveal strong correlations for pressure, temperature, Water Vapor Pressure (WVP), and refractivity profiles, with temperature exhibiting larger variations (RMSE = 1.24°C). Statistical analyses confirm statistically insignificant differences between PlanetiQ and COSMIC profiles at the same spatio-temporal coordinates. Comparisons with NWP models show slight differences with GFS, with overall RMSE values of 0.23 mb (WVP), 0.6 mb (pressure), 1.3 (refractivity), and 1.5°C (temperature). However, assessments against GFS/ECMWF models indicate overall compatibility, with insignificant differences between PlanetiQ profiles and models observations.

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Study of Ionospheric Bending Angle and Scintillation Profiles Derived by GNSS Radio-Occultation with MetOp-A Satellite

Cited by 5 publications

References 55 publications

Assessment of GRAS Ionospheric Measurements for Ionospheric Model Assimilation

Assessment of GRAS Ionospheric Measurements for Ionospheric Model Assimilation

IONOLAB-Fusion: Fusion of Radio Occultation into Computerized Ionospheric Tomography

PlanetiQ Radio Occultation: Preliminary Comparative Analysis of Neutral Profiles vs. COSMIC and NWP Models

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