Results 91 to 100 of about 1,121 (191)

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

Tutorial on GNSS Polarimetric Radio Occultations (GNSS PRO)

, 2020
Talk delivered in 1st Paz Polarimetric Radio Occultations User Workshop, 23 April ...
Cardellach, Estel, Padullés, Ramon, Ao, Chi On, Turk, F. Joe, Torre-Juárez, Manuel de la   +4 more
openaire   +1 more source

Forward operator for polarimetric radio occultation measurements [PDF]

Atmospheric Measurement Techniques
Global Navigation Satellite System (GNSS) polarimetric radio occultation (PRO) observations sense the presence of hydrometeor particles along the ray path by measuring the difference of excess phases in horizontally and vertically polarised carrier waves.
D. Hotta, D. Hotta, K. Lonitz, S. Healy
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

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

GNSS occultation sounding for climate monitoring

, 2001
Considerable efforts are currently invested into the setup of a Global Climate Observing System (GCOS) for monitoring climate change over the coming decades, which is of high relevance given concerns on increasing human influences.
Kornblueh, L., A.K. Steiner, Kirchengast, G., E. Manzini, Foelsche, U., Bengtsson, Lennart, Manzini, E. ; https://orcid.org/, U. Foelsche, G. Kirchengast, Steiner, A.K., Manzini, E., L. Kornblueh, Bengtsson, L., Steiner, A., L. Bengtsson   +14 more
core   +1 more source

Combination of GNSS tomography and GNSS radio occultation to establish wet refractivity fields

, 2019
The GNSS tomography is a novel technique which uses the GNSS data for resolving a temporal and spatial field of the atmospheric water vapour above a network of receivers.
Hanna, Natalia, Weber, Robert, Möller, Gregor   +2 more
core  

Assessment of Accuracy of COSMIC and KOMPSAT GNSS Radio Occultation Temperature and Pressure Measurements over the Philippines

Atmosphere
Radio occultation (RO) is a technique used for measuring planetary atmosphere properties by orbiting satellites, like temperature, pressure, and water vapor.
Karl Philippe A. Descalzo, Ernest P. Macalalad   +1 more
doaj   +1 more source

Review of Assimilating Spaceborne Global Navigation Satellite System Remote Sensing Data for Tropical Cyclone Forecasting

Remote Sensing
Global Navigation Satellite System (GNSS) Radio Occultation (RO) and GNSS Reflectometry (GNSS-R) are the two major spaceborne GNSS remote sensing (GNSS-RS) techniques, providing observations of atmospheric profiles and the Earth’s surface. With the rapid
Weihua Bai, Guanyi Wang, Feixiong Huang, Yueqiang Sun, Qifei Du, Junming Xia, Xianyi Wang, Xiangguang Meng, Peng Hu, Cong Yin, Guangyuan Tan, Ruhan Wu   +11 more
doaj   +1 more source

Sub‐Seasonal Impact of GNSS Radio Occultation Data

Geophysical Research Letters
Abstract This study investigates for the first time whether the assimilation of the Global Navigation Satellite System Radio occultation (GNSS‐RO) data has a significant impact on the European Centre for Medium‐Range Weather Forecasts sub‐seasonal forecasts.
K. Lonitz, F. Vitart, S. B. Healy, Qiang Fu   +3 more
openaire   +1 more source