Results 11 to 20 of about 200,933 (218)

Atmospheric Rivers in Africa Observed with GNSS-RO and Reanalysis Data

Remote Sensing
Atmospheric Rivers (ARs) transport significant amounts of moisture and cause extreme precipitation events, yet their behavior over Africa is not well understood. This study addresses this gap by analyzing the occurrence, seasonal variability, and spatial
Linda Martina Maier, Bahareh Rahimi, Ulrich Foelsche   +2 more
doaj   +3 more sources

Global GNSS-RO Electron Density in the Lower Ionosphere [PDF]

Remote Sensing, 2022
Lack of instrument sensitivity to low electron density (Ne) concentration makes it difficult to measure sharp Ne vertical gradients (four orders of magnitude over 30 km) in the D/E-region. A robust algorithm is developed to retrieve global D/E-region Ne from the high-rate GNSS radio occultation (RO) data, to improve spatiotemporal coverage using recent
Dong L. Wu, Daniel J. Emmons, Nimalan Swarnalingam   +2 more
core   +7 more sources

The 2021 La Palma volcanic eruption and its impact on ionospheric scintillation as measured from GNSS reference stations, GNSS-R and GNSS-RO [PDF]

Natural Hazards and Earth System Sciences, 2023
Abstract. Ionospheric disturbances induced by seismic activity have been studied in recent years by many authors, showing an impact both before and after the occurrence of earthquakes. In this study, the ionospheric scintillation produced by the 2021 La Palma volcano eruption is analyzed.
C. Molina, B.-E. Boudriki Semlali, G. González-Casado, H. Park, H. Park, A. Camps, A. Camps, A. Camps   +7 more
openaire   +6 more sources

The 2021 volcanic eruption in La Palma Island and its impact on ionospheric scintillation as measured from GNSS reference stations, GNSS-R, and GNSS-RO [PDF]

, 2022
Abstract. Ionospheric disturbances induced by seismic activity have been studied in the last years by many authors, showing an impact both before and after the occurrence of earthquakes. In this study, the ionospheric scintillation produced by the 2021 La Palma volcano eruption is analyzed.
Molina Ordóñez, Carlos, Boudriki Semlali, Badr Eddine, Hyuk, Park, Camps Carmona, Adriano José   +3 more
openaire   +4 more sources

Rádio Ocultação GNSS: Revisão Teórica, Missões e Produtos [PDF]

Revista Brasileira de Cartografia, 2022
A rádio ocultação (RO) começou a ser utilizada para a sondagem da atmosfera de outros planetas a partir da década de 1960. Com o desenvolvimento do Global Navigation Satellite System (GNSS) e de missões com satélites de baixa órbita (Low Earth Orbit ...
Gabriel Oliveira Jerez, Daniele Barroca Marra Alves, Raphael Silva Nespolo, João Francisco Galera Monico, Manuel Hernández-Pajares   +4 more
doaj   +2 more sources

Ionospheric Data Fusion With GNSS, GNSS‐RO and Satellite Altimetry Based on Machine Learning

Journal of Geophysical Research: Machine Learning and Computation
Global Ionospheric Maps (GIMs) are essential in Global Navigation Satellite System (GNSS) applications, particularly for correcting ionospheric delays in single‐frequency positioning. GIMs are mainly derived from dual‐frequency GNSS observations, but the
Marcel Iten, Shuyin Mao, Benedikt Soja
doaj   +3 more sources

Stability of CubeSat Clocks and Their Impacts on GNSS Radio Occultation [PDF]

Remote Sensing, 2022
Global Navigation Satellite Systems’ radio occultation (GNSS-RO) provides the upper troposphere-lower stratosphere (UTLS) vertical atmospheric profiles that are complementing radiosonde and reanalysis data. Such data are employed in the numerical weather
Amir Allahvirdi-Zadeh, Joseph Awange, Ahmed El-Mowafy, Tong Ding, Kan Wang   +4 more
doaj   +3 more sources

Processing multiple GNSS RO data using FSI and ROPP: results from the ROMEX [PDF]

Atmospheric Measurement Techniques
Global Navigation Satellite System (GNSS) Radio Occultation (RO) is a vital technique in atmospheric remote sensing, providing all-weather, high-resolution vertical observations that support numerical weather prediction (NWP) and atmospheric research. To
Y. Chen, X. Zhou, X. Jing, S.-P. Ho, X. Shao, T.-C. Liu   +5 more
doaj   +2 more sources

How does assimilating a large commercial GNSS RO dataset impact HAFS hurricane forecasts? An evaluation in support of the ROMEX experiment [PDF]

Atmospheric Measurement Techniques
While Global Navigation Satellite System (GNSS) radio occultation (RO) data assimilation improves tropical cyclone (TC) intensity forecasts, the scaling of these impacts with RO observation volume remains unclear.
W. J. Miller, Y. Chen, S.-P. Ho, X. Shao
doaj   +2 more sources

Can the Spire GNSS-RO CubeSats Constellation Observe Earth's Gravity Field?

Dual-frequency GNSS data from onboard Precise Orbit Determination (POD) antennas has emerged as a promising tool for investigating the time-variable components of Earth's gravity field. Over the past two decades, POD antennas onboard Low Earth Orbit (LEO) satellites have significantly advanced the study of the long-wavelength components of Earth's ...
SHAFIEI, Parisa, TABIBI, Sajad
openaire   +3 more sources