Results 61 to 70 of about 2,499 (207)

A Computationally Efficient Method for Deriving Instantaneous F2 Layer Peak Parameters From Climatological Maps and TEC Observations

Journal of Geophysical Research: Space Physics, Volume 131, Issue 4, April 2026.
Abstract International Reference Ionosphere (IRI) and the Ionosphere‐Plasmasphere (IRI‐Plas) models describe monthly median ionospheric conditions. IRI‐Plas, unlike IRI, allows one to include instantaneous Total Electron Content observations (TEC) to adjust the median predictions. The standard IRI‐Plas generates monthly medians of foF2m, hmF2m and TECm
T. L. Gulyaeva, F. Arikan, M. Hernández‐Pajares, I. Stanislawska, A. M. Padokhin   +4 more
wiley   +1 more source

Ionospheric tilting of 21 August 2017 total solar eclipse sounded by GNSS ground-based receivers and radio occultation

Terrestrial, Atmospheric and Oceanic Sciences, 2021
A total solar eclipse passed over the continental United States from the west to the east coast on 21 August 2017. Measurements made by more than 2200 groundbased GNSS (Global Navigation Satellite System) receivers observed a significant decrease in ...
Chi-Yen Lin, Jann-Yenq Liu, Yang-Yi Sun, Charles Chien-Hung Lin, Loren C. Chang, Chao-Yen Chen, Chia-Hung Chen   +6 more
doaj   +1 more source

Using A Sliding Window Phase Matching Method for Imaging of GNSS Radio Occultation Signals

Remote Sensing, 2021
Global Navigation Satellite System Radio Occultation (GNSS-RO) is a technique used to sound the atmosphere and derive vertical profiles of refractivity.
Thomas Sievert, Joel Rasch, Anders Carlström, Vinícius Ludwig Barbosa, Mats I. Pettersson, Viet Vu   +5 more
doaj   +1 more source

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

Potential Impacts of Radio Occultation Data Assimilation on Forecast Skill of Tropical Cyclone Formation in the Western North Pacific

Geophysical Research Letters, 2023
This study assesses the potential influence of global navigation satellite system (GNSS) radio occultation (RO) data assimilation on the forecast skill of tropical cyclone formation over the western North Pacific in September–October 2019 through a ...
Hsu‐Feng Teng, Ying‐Hwa Kuo, James M. Done   +2 more
doaj   +1 more source

Application of an optimal estimation inverse method to GPS/MET bending angle observations [PDF]

, 2001
Palmer et al. [2000] describes an optimal estimation inverse method for radio occultation (RO) bending angle measurements to retrieve simultaneously temperature, humidity, and surface pressure; outlines quality control procedures for retrieved profiles ...
Ahmad, Cullen, Eyre, Fjeldbo, Healy, John J. Barnett, Kuo, Kursinski, Kursinski, Kursinski, Lorenc, Palmer, Paul I. Palmer, Press, Rocken, Rodgers, Rodgers, Steiner, Ware, Zou   +19 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

TriG - A GNSS Precise Orbit and Radio Occultation Space Receiver [PDF]

, 2009
The GPS radio occultation (RO) technique [1] produces measurements in the ionosphere and neutral atmosphere [2] that contribute to monitoring space weather and climate change; and improving operational weather prediction.
Esterhuizen, Stephan, Franklin, Garth, Hurst, Ken, Mannucci, Anthony, Meehan, Tom, Webb, Frank, Young, Larry   +6 more
core  

Greenhouse gas profiling by infrared-laser and microwave occultation: retrieval algorithm and demonstration results from end-to-end simulations [PDF]

, 2011
Measuring greenhouse gas (GHG) profiles with global coverage and high accuracy and vertical resolution in the upper troposphere and lower stratosphere (UTLS) is key for improved monitoring of GHG concentrations in the free atmosphere.
G. Kirchengast, S. Schweitzer, V. Proschek   +2 more
core   +1 more source

Ionospheric Response to the 8 April 2024 Total Solar Eclipse: Plasma Depletion and Eclipse‐Driven MsTIDs

Space Weather, Volume 24, Issue 4, April 2026.
Abstract The total solar eclipse on 8 April 2024 provided a unique opportunity to investigate the three‐dimensional (3‐D) ionospheric response under enhanced solar activity over North America. In this study, we processed high‐density GNSS observations from ∼1,700 stations to derive vertical total electron content and applied a multi‐term sinusoidal ...
Wenbin Liang, Xiyan Sun, Yuanfa Ji, Xiaodong Ren   +3 more
wiley   +1 more source