Results 51 to 60 of about 847,572 (191)

Satellite radiance observation error inflation and spatial thinning: Reconciling idealized theory with near‐operational applications

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Satellite radiance observations are spatially thinned using a grid‐based selection that retains one representative profile per cell. When observation errors are spatially correlated but treated as uncorrelated in the assimilation system, reducing thinning increases their influence, leading to overfitting and reduced analysis fit with other observations.
Joel Bedard, Alain Beaulne, Mark Buehner, Laurence Coursol   +3 more
wiley   +1 more source

Impact of Two Radio Occultation Constellations on Numerical Weather Prediction: Polar‐Orbits Only and Mixed Polar‐Equatorial Orbits

Earth and Space Science, Volume 13, Issue 10, October 2026.
Abstract This study explores the relative impact of two orbital configurations for Global Navigation Satellite System radio occultation (RO) observations in numerical weather prediction using observing system simulation experiments (OSSE). Three experiments are carried out: a Control experiment with no RO observations and two experiments with 14,000 RO
Nikki C. Privé, Christopher Barsoum, Douglas Hunt, Michael J. Murphy, Richard Anthes, William Gullotta, Natalie Laudier   +6 more
wiley   +1 more source

Coupled Thermosphere–Ionosphere Dynamics During the 17 January 2013 Storm: GITM–TIDAS Comparison With Millstone Hill ISR Measurements

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract This article analyzes a weak geomagnetic storm on January 17–18, 2013, using a first‐principles model (Global Ionosphere Thermosphere Model (GITM) with an empirical assimilative ionospheric model (TIDAS), evaluated against observations in the form of Millstone Hill (MH) incoherent scatter radar (ISR) altitude profiles and global navigation ...
Onyinye Nwankwo‐Omoloja, Aaron J. Ridley, Shun‐Rong Zhang, Philip J. Erickson   +3 more
wiley   +1 more source

Effect of Multiple GNSS Integration on the Number and Spatiotemporal Coverage of Radio Occultation Events

Atmosphere, 2022
The development of global navigation satellite systems (GNSSs) and multi-system compatible radio occultation (RO) techniques provides favorable conditions and opportunities for increasing the number of occultation events and improving their ...
Congliang Liu, Yueqiang Sun, Weihua Bai, Qifei Du, Wei Li, Xi Wang, Peixian Li   +6 more
doaj   +1 more source

OI 630 nm Airglow Observed From Space as a Diagnostic of Nighttime Low‐Latitude Ionospheric Dynamics

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract This study investigates the nighttime morphology of the bottomside F region (∼250 km) at low latitudes using 630 nm airglow measurements from the Visible and Infrared Spectral Imager (VISI) aboard the Ionosphere, Mesosphere, Upper Atmosphere, and Plasmasphere (IMAP) mission on the International Space Station. For this purpose, we analyzed IMAP/
Hyosub Kil, Se‐Heon Jeong, Jeong‐Heon Kim, Woo Kyoung Lee, Young‐Sil Kwak, Akinori Saito, Takeshi Sakanoi   +6 more
wiley   +1 more source

GNSS Radio Occultation Simulation Using Multiple Phase Screen Orbit Sampling

, 2020
Wave optics propagators (WOPs) are commonlyused to describe the propagation of radio signals through earth’satmosphere. In radio occultation (RO) context, multiple phasescreen (MPS) method has been used to model the effects of theatmosphere in Global ...
Carlström, Anders,, Pettersson, Mats, Rasch, Joel,, Rasch, Joel, Ludwig Barbosa, Vinícius, Ludwig Barbosa, Vinícius,, Vu, Viet Thuy,, Pettersson, Mats,, Carlström, Anders, Vu, Viet Thuy   +9 more
core   +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

Key Parameters for the Ionospheric Detection of Tsunamis From the 29 July 2025 Kamchatka Event

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract It has been demonstrated that tsunamis generate internal gravity waves (GWs) detectable in the ionosphere within 20–60 min after their generation at the ocean surface. Despite numerous simulation and observation studies on ionospheric signatures of tsunamis, the detection of Co‐tsunamic Ionospheric Disturbances (CTIDs) and distinguishing them ...
Clélia Maréchal, Elvira Astafyeva, Lucie Rolland, Anthony Sladen, Boris Maletckii   +4 more
wiley   +1 more source

Analyses for a Modernized GNSS Radio Occultation Receiver [PDF]

, 2015
Global Navigation Satellite System (GNSS) radio occultation (RO) is a remote sensing technique that exploits existing navigation signals to make global, real-time observations of the Earth's atmosphere.
Griggs, Erin Rose
core   +3 more sources

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