Results 81 to 90 of about 200,933 (218)

GNSS-RO LEO satellite orbit optimization for Egypt and the Middle East region

Alexandria Engineering Journal, 2020
The “Radio Occultation (RO)” method is one from the simple, accurate and high resolution methods that produces a complete atmosphere model. Each region/country optimizes a “Low Earth Orbiter (LEO)” satellite orbit that covers its climate requirements by processing the “Global Navigation Satellite System (GNSS)” received signal.
Ibrahim Fouad Ghoniem, Ashraf El-Kutb Mousa, Gamal El-Fiky   +2 more
openaire   +2 more sources

GNSS Signal Jamming as Observed From Radio Occultation

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
The jamming is found to increase significantly in recent years, and its impact is evident in Global Navigation Satellite System (GNSS) radio occultation (RO) measurements, such as those from COSMIC-2.
Dong L. Wu
doaj   +1 more source

Correlation of High‐Latitude Scintillation With Auroral Precipitation: Case Studies Using GNSS Radio Occultation Data From PlanetiQ

Space Weather, Volume 24, Issue 9, September 2026.
Abstract This study presents a survey of high‐latitude ionospheric scintillation using GNSS radio occultation (RO) data from the PlanetiQ satellite. The analysis examines 483 high‐latitude RO tracks between January and May 2023, with 371 tracks exhibiting scintillation events.
Margaret W. Chen, Endawoke Yizengaw, James H. Hecht, Paul Straus, Charles S. Carrano, Tibor Durgonics, Keith M. Groves   +6 more
wiley   +1 more source

On the Origin of Summer Sporadic E Periodicities at Midlatitudes

Space Weather, Volume 24, Issue 9, September 2026.
Abstract Summertime midlatitude sporadic E (Es) layers exhibit daily periodicities whose underlying physical causes remain to be fully identified. We investigate the origin of these periodicities by analyzing an 11‐year data set (2007–2017) comprising ionosonde measurements, FORMOSAT‐3/COSMIC radio occultation (RO) observations, and WACCM‐X neutral ...
Xu Yan, Hongtao Cai, Yusong Qin, Chao Xiong, Jiawei Zhou, Hongwen Xu, Lubing Yang   +6 more
wiley   +1 more source

Technical Note on Quality Assessment for SPIRE GNSS-RO

In this study the quality assessment of SPIRE GNSS-RO atmopsheric data (pressure and temperature profiles) are presented. Measurements are acquired by STRATOS paylod that makes use of GPS occultation measurements to determine temperature,pressure and humidity profiles of Earth's atmosphere for application in operationalmeteorology.The instrument ...
Piro, Alessandro, Albinet, Clement
openaire   +2 more sources

Validation of Global Ionospheric Specification (GIS) Electron Density Measurements During Solar Minimum to Solar Maximum Under Quiet and Disturbed Geomagnetic Conditions

Space Weather, Volume 24, Issue 9, September 2026.
Abstract Global Ionospheric Specification (GIS) three‐dimensional electron density profiles constructed by assimilating the line‐of‐sight total electron content (TEC) from global navigation satellite system (GNSS) radio occultation (RO) measurements by FORMOSAT‐7/COSMIC‐2 (F7/C2) and ground‐based receiver network from international GNSS service ...
P. K. Rajesh, C. H. Charles Lin, C. Y. Lin, T. Matsuo, H. Jin, S. Perwitasari, M. Nishioka, Chao‐Yen Chen   +7 more
wiley   +1 more source

Quasi 6‐Day Wave Variability in the Thermosphere and Ionosphere: Observations and Modeling

Earth and Space Science, Volume 13, Issue 9, September 2026.
Abstract Satellite observations of the upper mesosphere and lower thermosphere from TIMED‐SABER and ICON‐MIGHTI reveal a clear Quasi 6‐Day Wave (Q6DW) event in the winds and temperatures in this region. This Q6DW event persists across multiple data sets throughout the middle‐to‐upper thermosphere and the F‐region ionosphere, including GOLD disk ...
Oluwafisayo P. Owolabi, Scott L. England, Yen‐Jung Wu   +2 more
wiley   +1 more source

Advancing GNSS-RO Detection of Ionospheric Irregularities Using Refined Back Propagation and GOLD Data

This paper investigates on the detection and localization of ionospheric irregularities using GNSS Radio Occultation (GNSS-RO). We propose a new segmented phase screen (PS) approach to improve vertical and horizontal localization and remove the presence ...
Pettersson, Mats, Rasch, Joel, Quilis Alfonso, Carles, Ludwig Barbosa, Vinícius, Carlström, Anders, Vu, Viet Thuy, Carlström, Anders,, Rasch, Joel,, Ludwig Barbosa, Vinícius,, Vu, Viet Thuy,, Pettersson, Mats,, Quilis Alfonso, Carles,   +11 more
core   +1 more source

ROB-GNSS/GNSS-DCAT-AP

, 2023
Proposal for a DCAT-AP extension for GNSS observation ...
Bruyninx, Carine, Oset Garcia, Paula, Miglio, Anna, Fabian, Andras, Van Nieuwerburgh, Inge, De Bodt, Stefanie, Legrand, Juliette   +6 more
core   +1 more source

Impact of Solar Cycles on the Electron Density in the Ionosphere—An 18‐Year Combined Observation From FORMOSAT‐3/COSMIC and FORMOSAT‐7/COSMIC‐2

Journal of Geophysical Research: Space Physics, Volume 131, Issue 9, September 2026.
Abstract The Earth's ionosphere is sensitive to variations in solar irradiance associated with the 11‐year and the 27‐day solar cycles (SCs). Previous studies have suggested that the peak altitude of the 27‐day SC response in ionospheric electron density is significantly higher than that of the 11‐year SC response, but the underlying mechanism remains ...
Shuhui Wang, King‐Fai Li, Mao‐Chang Liang, Ka‐Kit Tung, Lin Tan   +4 more
wiley   +1 more source