Results 81 to 90 of about 853 (193)

Analysis of GNSS radio occultation data from satellite ZH-01

Earth and Planetary Physics, 2018
The electromagnetic satellite Zhangheng 01 (ZH-01) was successfully launched on February 2, 2018. The GNSS Radio Occultation (GRO) receiver on board the satellite is able to observe the occultation events of GPS and BeiDou navigation satellites.
Yan Cheng, Jian Lin, XuHui Shen, Xiang Wan, XinXing Li, WenJun Wang   +5 more
doaj   +1 more source

Calibration and Fusion of GOLD‐Inferred TEC Data With Ground‐Based TEC

Space Weather, Volume 24, Issue 6, June 2026.
Abstract Ground‐based Global Navigation Satellite System (GNSS) receivers provide primary total electron content (TEC) measurements used to monitor ionospheric variability, yet their sparse distribution over oceanic and equatorial regions limits global coverage and model accuracy.
Maria Smirnova, Shasha Zou, Grace Kwon, Hang Liu, Yang Chen   +4 more
wiley   +1 more source

Four-Dimensional Topside Electron Density Modeling Using Multi-Stage Deep Learning Approaches

Remote Sensing
Accurate modeling of topside ionospheric electron density is essential for improving GNSS positioning and understanding upper-atmosphere dynamics. A new four-dimensional (spatial and temporal) topside electron density model is developed using global GNSS
Changyong He, Andong Hu, Han Cai, Zhaohui Xiong, Dunyong Zheng   +4 more
doaj   +1 more source

Long-term changes in the dependence of NmF2 on solar flux at Juliusruh [PDF]

Understanding the ionospheric dependence on solar activity is crucial for the comprehension of the upper atmosphere. The response of the ionosphere to solar EUV flux has been previously considered stable. Subsequent studies have revealed long-term changes that are not yet fully understood.
Tan Jun Rios, Maria Gloria, Borries, Claudia, Liu, Huixin   +2 more
openaire   +1 more source

Long-term trends of ionospheric electron density related to global warming

Journal of Space Weather and Space Climate
Long-term trends of ionospheric electron density have been studied using vertical sounding measurements at 10 ionosonde stations from European, Asian, and American longitude sectors.
Jakowski Norbert, Hoque Mohammed Mainul
doaj   +1 more source

Long-term comparison of the ionospheric F2 layer electron density peak derived from ionosonde data and Formosat-3/COSMIC occultations

Journal of Space Weather and Space Climate, 2015
Electron density profiles (EDPs) derived from GNSS radio occultation (RO) measurements provide valuable information on the vertical electron density structure of the ionosphere and, among others, allow the extraction of key parameters such as the maximum
Limberger Marco, Hernández-Pajares Manuel, Aragón-Ángel Angela, Altadill David, Dettmering Denise   +4 more
doaj   +1 more source

Ionospheric Peak Parameters Retrieved from FY-3C Radio Occultation: A Statistical Comparison with Measurements from COSMIC RO and Digisondes Over the Globe

Remote Sensing, 2019
In this study, two ionospheric peak parameters (ICPs), NmF2 and hmF2, derived from the global navigation satellite system (GNSS) radio occultation (RO) ionospheric electron density profiles (EDPs) obtained by Feng-Yun 3C (FY-3C) mission are compared with
Han Wang, Jia Luo, Xiaohua Xu
doaj   +1 more source

Evaluation of GNSS-TEC Data-Driven IRI-2016 Model for Electron Density

Atmosphere
The ionosphere is one of the important error sources that affect the communication of radio signals. The international reference ionosphere (IRI) model is a commonly used model to describe ionospheric parameters.
Jing Peng, Yunbin Yuan, Yanwen Liu, Hongxing Zhang, Ting Zhang, Yifan Wang, Zelin Dai   +6 more
doaj   +1 more source

Equinoctial asymmetry in solar activity variations of NmF2 and TEC [PDF]

, 2012
The ionosonde NmF2 data (covering several solar cycles) and the JPL TEC maps (from 1998 through 2009) were collected to investigate the equinoctial asymmetries in ionospheric electron density and its variation with solar activity.
L. Liu, Z. Ren, Y. Chen, W. Wan
core   +2 more sources

Long‐Term Trends of Ionospheric Peak Electron Density and Height

Space Weather
Long‐term trends in ionospheric electron density have been investigated using vertical sounding data from 14 ionosonde stations spanning European, Asian, and American longitude sectors. The study examines the relationship between the ionospheric F2 layer
N. Jakowski, M. M. Hoque, M. G. Tan Jun Rios   +2 more
doaj   +1 more source