Results 71 to 80 of about 7,524 (217)

Using the Commercial GNSS RO Spire Data in the Neutral Atmosphere for Climate and Weather Prediction Studies

Remote Sensing, 2023
Recently, the NOAA has included GNSS (Global Navigation Satellite System) Radio Occultation (RO) data as one of the crucial long-term observables for weather and climate applications.
Shu-peng Ho, Xinjia Zhou, Xi Shao, Yong Chen, Xin Jing, William Miller   +5 more
doaj   +1 more source

Errors in GNSS radio occultation data: relevance of the measurement geometry and obliquity of profiles [PDF]

, 2011
Atmospheric profiles retrieved from GNSS (Global Navigation Satellite System) radio occultation (RO) measurements are increasingly used to validate other measurement data.
G. Kirchengast, J. Fritzer, S. Syndergaard, U. Foelsche   +3 more
core   +1 more source

Location of Ionospheric Irregularities in Extended GNSS-RO Measurements Using Back Propagation Method

2023 XXXVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS), 2023
Besides providing electron density profiles (EDP), GNSS Radio Occultation (GNSS-RO) measurements allow monitoring the frequency and the areas where ionospheric scintillations occur. In this work, RO measurements composing an experimental data set are processed with the back propagation (BP) method to estimate the location of sporadic E-clouds and ...
Ludwig Barbosa, Vinícius, Rasch, Joel, Carlstrom, Anders, Christensen, Jacob, Vu, Viet Thuy, Pettersson, Mats   +5 more
openaire   +2 more sources

TOMO4D Operator for Assimilation of GNSS Tomography‐Derived Water Vapor Fields Into the WRFDA 4DVAR System to Improve Regional Rainfall Forecasting

Journal of Advances in Modeling Earth Systems, Volume 18, Issue 4, April 2026.
Abstract Accurate representation of atmospheric water vapor is crucial for improving numerical weather prediction, particularly over regions with complex topography and sparse observation networks. Although assimilation of Global Navigation Satellite System (GNSS)‐derived integrated products such as zenith total delay or precipitable water vapor can ...
Arash Tayfehrostami, Yazdan Amerian, Saeed Izanlou, Majid Azadi   +3 more
wiley   +1 more source

Identification of ionospheric scintillation in the low-latitude African sector using a commercial CubeSat constellation

Journal of Space Weather and Space Climate
Radio occultation (RO) measurements performed by Global Navigation Satellite System (GNSS) receivers onboard low-earth orbit (LEO) satellites are commonly used for a variety of atmospheric applications, including ionospheric and space weather studies. We
Mohanty Shradha, Hoque M. Mainul, Angling Matthew J.   +2 more
doaj   +1 more source

Comparative Assessment of Spire and COSMIC-2 Radio Occultation Data Quality

Remote Sensing, 2023
In this study, we investigate the performances of a commercial Global Navigation Satellite System (GNSS) Radio Occultation (RO) mission and a new-generation RO constellation, i.e., Spire and Constellation Observing System for Meteorology, Ionosphere, and
Cong Qiu, Xiaoming Wang, Kai Zhou, Jinglei Zhang, Yufei Chen, Haobo Li, Dingyi Liu, Hong Yuan   +7 more
doaj   +1 more source

STE-QUEST Mission and System Design - Overview after completion of Phase-A

, 2014
STE-QUEST is a fundamental science mission which is considered for launch within the Cosmic Vision programme of the European Space Agency (ESA). Its main scientific objectives relate to probing various aspects of Einstein's theory of general relativity ...
Beck, Jan, Hechenblaikner, Gerald, Hess, Marc-Peter, Vitelli, Marianna   +3 more
core   +1 more source

A High‐Accuracy TEC Model for Low‐Mid Latitudes Using a BWO‐Optimized CNN‐xLSTM Hybrid Model With Multi‐Instrument Data Fusion

Space Weather, Volume 24, Issue 4, April 2026.
Abstract The total electron content (TEC) in the ionosphere is strongly affected by solar activity and geomagnetic disturbances in mid‐ and low‐latitude regions, making it a major source of error in GNSS navigation and communication systems. To improve the prediction accuracy of ionospheric TEC, this study proposes a deep learning model—Beluga Whale ...
Wang Li, Jitong Li, Jiale Li, Guanyu Chen, Dongsheng Zhao, Longjiang Li, Xiaoqing Zuo, Kefei Zhang   +7 more
wiley   +1 more source

Rapid Evolution of Super Equatorial Plasma Bubbles and X‐Pattern EIA Formation During Extreme Storm Conditions on 12 November 2025

Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.
Abstract Extreme conditions during storms profoundly alter the evolution of equatorial plasma bubbles (EPBs), yet the key dynamics remains poorly understood. We document the rapid expansion, contraction, and decay of super EPBs in South America during the 12 November 2025 storm with Interplanetary Magnetic Field (IMF) Bz/By magnitude exceeding ∼50 nT ...
Shasha Zou, Lei Liu, Hang Liu, Anthea Coster, Robert Kerr, Jonas Souza, Angela Santos   +6 more
wiley   +1 more source

Joint 1DVar retrievals of tropospheric temperature and water vapor from Global Navigation Satellite System radio occultation (GNSS-RO) and microwave radiometer observations [PDF]

Atmospheric Measurement Techniques
Global Navigation Satellite System radio occultation (GNSS-RO) and microwave radiometry (MWR) are two of the most impactful spaceborne remote sensing techniques for numerical weather prediction (NWP).
K.-N. Wang, C. O. Ao, M. G. Morris, G. A. Hajj, M. J. Kurowski, F. J. Turk, A. W. Moore   +6 more
doaj   +1 more source