Results 71 to 80 of about 420 (173)

Global Ionospheric Slab Thickness Prediction Model Using XGBoost and Ensemble Learning

Space Weather, Volume 24, Issue 1, January 2026.
Abstract The ionospheric equivalent slab thickness is a key parameter for understanding the plasma distribution in the ionosphere, with direct relevance to satellite navigation, communication, and skywave over‐the‐horizon radar. However, traditional prediction methods often suffer from regional biases, limiting their global applicability.
C. Han, X. R. Chong, M. Ou, D. D. Wang, J. Feng, G. Chen, X. L. Min, D. W. Wang, Z. X. Gao   +8 more
wiley   +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

Variations in Ionospheric Parameters Associated With the 20–21 May 2012 Annular and 21 August 2017 Total Solar Eclipses

The Scientific World Journal, Volume 2026, Issue 1, 2026.
This study investigates the ionospheric effects of the annular solar eclipse (20–21 May 2012) and total solar eclipse (21 August 2017) across midlatitude stations, analyzing critical parameters: F2‐layer critical frequency (foF2), peak height (hmF2), and total electron content (TEC).
Manghang Limbu, Samyam Pudasaini, Sujan Prasad Gautam, Binod Adhikari, Ashok Silwal, Iva Kumari Lamichhane, Rohit Bhattarai, Pitri Bhakta Adhikari, K.-W.-A. Chee   +8 more
wiley   +1 more source

First Observation of Localized F Region Bottom‐Type Scattering Layer by All‐Sky Radar at Low Latitude

Geophysical Research Letters, Volume 52, Issue 23, 16 December 2025.
Abstract F‐region bottom‐type scattering layers (BSLs) occurring over equatorial and low latitudes may act as the precursor of plasma bubbles, usually observed by narrow‐beam very high frequency radars. However, their spatial features remain unknown due to the radar narrow field‐of‐view.
Wenjie Sun, Guozhu Li, Lianhuan Hu, Biqiang Zhao, Jianfei Liu, Haiyong Xie, Guofeng Dai, Xiukuan Zhao, Yi Li, Baiqi Ning   +9 more
wiley   +1 more source

Local Time Variability of Gravity Wave Activity Revealed by SABER Temperature Observations

Geophysical Research Letters, Volume 52, Issue 23, 16 December 2025.
Abstract The global characteristics of gravity wave potential energy variation depending on local time are analyzed using satellite observations covering a broad range of local times. A clear diurnal variation is observed in the equatorial region between 15°S and 15°N.
D. Koshin, N. M. Pedatella, A. K. Smith, H.‐L. Liu   +3 more
wiley   +1 more source

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

Observing atmospheric rivers using GNSS radio occultation data

Abstract. Atmospheric Rivers (AR) are comparatively narrow regions in the atmosphere that are responsible for most of the horizontal transport of water vapor in the extra tropics, which are responsible for many extreme precipitation events and floodings at mid-latitudes, including Europe and the US. The critical role of ARs in global moisture transport
Bahareh Rahimi, Ulrich Foelsche
openaire   +2 more sources

The effect of solar radio bursts on the GNSS radio occultation signals

Journal of Geophysical Research: Space Physics, 2013
AbstractSolar radio burst (SRB) is the radio wave emission after a solar flare, covering a broad frequency range, originated from the Sun's atmosphere. During the SRB occurrence, some specific frequency radio wave could interfere with the Global Navigation Satellite System (GNSS) signals and therefore disturb the received signals.
Yue, X., Schreiner, W., Kuo, Y., Zhao, B., Wan, W., Ren, Z., Liu, L., Wei, Y., Lei, J., Solomon, S., Rocken, C.   +10 more
openaire   +3 more sources

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