Results 51 to 60 of about 240 (162)

Sub‐Seasonal Impact of GNSS Radio Occultation Data

Geophysical Research Letters, Volume 52, Issue 21, 16 November 2025.
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
wiley   +1 more source

Multi-Sensor Image Classification Using the Random Forest Algorithm in Google Earth Engine with KOMPSAT-3/5 and CAS500-1 Images

Remote Sensing
This study conducted multi-sensor image classification by utilizing Google Earth Engine (GEE) and applying satellite imagery from Korean Multi-purpose Satellite 3 (KOMPSAT-3), KOMPSAT-5 SAR, Compact Advanced Satellite 500-1 (CAS500-1), Sentinel-1, and ...
Jeonghee Lee, Kwangseob Kim, Kiwon Lee
doaj   +1 more source

Comprehensive Analysis of Bias in TEMPO NO2 Column Densities Through Pandora Observations

Journal of Geophysical Research: Atmospheres, Volume 130, Issue 15, 16 August 2025.
Abstract Tropospheric Emissions: Monitoring of Pollution (TEMPO) is the first geostationary satellite instrument to monitor air pollutants across North America. This study uses Pandora observations to analyze the bias in TEMPO Level‐3 total column density of NO2 (TOTNO2) from August 2023 to December 2024.
Masoud Ghahremanloo, Caroline Nowlan, Gonzalo González Abad, Cecilia Garraffo, Xiong Liu, Huiqun Wang, Barron Henderson, Eric Baumann, Lukas Valin, Jeffrey A. Geddes, Xiaoyi Zhao   +10 more
wiley   +1 more source

Ground Track Maintenance Maneuver Simulations for the KOMPSAT Spacecraft [PDF]

Journal of Astronomy and Space Sciences, 1998
Ground track maintenance maneuver simulations for the KOMPSAT spacecraft are performed for three and half years. Both longitude targeting and time targeting strategies are applied for in-plane maneuvers. The nominal longitude bands of maneuvers for ±5 km
Byoung-Sun Lee, Jeong-Sook Lee
doaj  

Systematic Slowing of Initially Rapid Retreat of New Coasts Formed by Historical Eruptions in Volcanic Islands

Journal of Geophysical Research: Earth Surface, Volume 130, Issue 8, August 2025.
Abstract Due to their exposure to waves, volcanic island coasts typically retreat with cliff collapses and other erosional processes. Understanding how retreat rates vary over time and in response to environmental and other factors could be useful for geohazard assessment, coastal management and landform reconstruction.
Zhongwei Zhao, Neil C. Mitchell, Rui Quartau, Ricardo S. Ramalho   +3 more
wiley   +1 more source

Assessment of Commercial GNSS Radio Occultation Performance from PlanetiQ Mission

Remote Sensing
Global Navigation Satellite System (GNSS) radio occultation (RO) provides valuable 3-D atmospheric profiles with all-weather, all the time and high accuracy. However, GNSS RO mission data are still limited for global coverage.
Mohamed Zhran, Ashraf Mousa, Yu Wang, Fahdah Falah Ben Hasher, Shuanggen Jin   +4 more
doaj   +1 more source

Airborne and Spaceborne Mapping and Analysis of the Subglacial Lake D2 in David Glacier, Terra Nova Bay, Antarctica

Journal of Geophysical Research: Earth Surface, Volume 130, Issue 6, June 2025.
Abstract During the 2018–2019 Antarctic summer, the Korea Polar Research Institute and the University of Texas Institute for Geophysics collaborated on a helicopter‐based ice‐penetrating radar (IPR) survey over the active subglacial lake D2 (SLD2), located in the midstream of the David Glacier, Terra Nova Bay, Antarctica.
Hyeontae Ju, Seung‐Goo Kang, Hyangsun Han, Lucas H. Beem, Gregory Ng, Kristian Chan, Taewook Kim, Joohan Lee, Jongik Lee, Yeadong Kim, Sukjoon Pyun   +10 more
wiley   +1 more source

Analysis and Simulations for the Severe Turbulence Event Aloft Myanmar on 21 May 2024

Meteorological Applications, Volume 32, Issue 3, May/June 2025.
This paper performed an analysis of a severe turbulence event encountered by Singapore airlines SQ321 on 21 May 2024 over Myanmar, which led to one fatality and multiple injuries. Model simulation with convective permitting resolution indicated the development of convective cells, but precise Eddy Dissipation Rate (EDR) values are difficult to obtain ...
Christy Yan Yu Leung, Haoming Chen, Xiaoming Shi, Ping Cheung, Pak Wai Chan   +4 more
wiley   +1 more source

Validation of GPS Based Precise Orbits Using SLR Observations [PDF]

Journal of Astronomy and Space Sciences, 2009
In this study, the YLPODS (Yonsei Laser-ranging Precision Orbit Determination System) is developed for POD using SLR (Satellite Laser Ranging) NP (Normal Point) observations. The performance of YLPODS is tested using SLR NP observations of TOPEX/POSEIDON
Young-Rok Kim, Eunseo Park, Sang-Young Park, Kyu-Hong Choi, Yoola Hwang, Hae-Yeon Kim, Byoung-Sun Lee, Jaehoon Kim   +7 more
doaj   +1 more source

Electron Phase Space Densities in Geostationary Orbits as Measured With GK2A, GOES‐16, and GOES‐17 Satellites

Journal of Geophysical Research: Space Physics, Volume 130, Issue 4, April 2025.
Abstract This study investigated electron phase space densities (PSDs) in geostationary orbits using data from Korea's geostationary satellite, GK2A, as well as GOES‐16 and GOES‐17 satellites. The PSDs were computed from electron fluxes measured by each satellite during a geomagnetically quiet period as defined by stringent conditions on geomagnetic ...
C. H. Lee, J. Seon, W. H. Seol, K. H. Kim, D. E. Larson, G. K. Parks, H. U. Auster, W. Magnes, S. Kraft, D. Y. Lee, A. Boudouridis, P. T. M. Loto'aniu, J. V. Rodriguez   +12 more
wiley   +1 more source