Results 41 to 50 of about 42,321 (217)

Effects of Strong Geomagnetic Storms on the Ionosphere and Degradation of Precise Point Positioning Accuracy during the 25th Solar Cycle Rising Phase: A Case Study

Remote Sensing, 2023
Approaching the peak year of the 25th solar activity cycle, the frequency of strong geomagnetic storms is gradually increasing, which seriously affects the navigation and positioning performance of GNSS.
Yifan Wang, Yunbin Yuan, Min Li, Ting Zhang, Hao Geng, Guofang Wang, Gang Wen   +6 more
doaj   +1 more source

Unusual Enhancement in He(23S) Airglow Brightness Associated With Interplanetary Magnetic Field Northward Turnings During the 2025 New Year's Day Storm

Geophysical Research Letters, Volume 53, Issue 19, 16 October 2026.
Abstract The upper thermosphere is important in the context of space weather, but continuous monitoring of the thermosphere at high latitudes remains limited despite its strong variations associated with geomagnetic activity. Orthohelium, He(23S), is found from the upper thermosphere to lower exosphere, and is a promising tracer of atmospheric dynamics.
Takanori Nishiyama, Masato Kagitani, Noora Partamies, Daniel Whiter, Takuo T. Tsuda, Yasunobu Ogawa, Fred Sigernes   +6 more
wiley   +1 more source

Detection and Analysis of an Upward Jet‐Like Electrical Discharge Intercepting a High‐Altitude Research Aircraft

Geophysical Research Letters, Volume 53, Issue 19, 16 October 2026.
Abstract During a 2023 field campaign, a NASA ER‐2 research aircraft intercepted an upward jet‐like electrical discharge at 20 km altitude over an intense tropical thunderstorm. This event was analyzed using airborne multispectral optical sensors, electric field mills, X‐band radar, passive microwave, and ground‐based radio networks.
T. J. Lang, A. Mezentsev, M. G. Quick, C. G. Amiot, M. Bateman, R. Blakeslee, S. Cummer, G. M. Heymsfield, R. A. Kroodsma, N. G. Lehtinen, D. Mach, M. Marisaldi, M. Walker McLinden, N. Østgaard, M. Pazos, D. A. S. Sarria, C. J. Schultz, T. D. Walker, O. van der Velde, K. Virts   +19 more
wiley   +1 more source

Ionospheric Perturbations and Their Impact on GNSS - Investigated by DLRs High-Rate Receiver Chain [PDF]

, 2013
Global Navigation Satellite Systems (GNSS) such as GPS, Galileo or Glonass provide good positioning results for a lot of applications. However, they can be heavily disturbed by space weather hazards.
Hlubek, Nikolai, Wilken, Volker, Jakowski, Norbert, Gewies, Stefan, Wassaie, Mogese, Damtie, Baylie   +5 more
core  

Two‐Dimensional Reconstruction of Ionospheric Plasma Density Variations Using Swarm

Space Weather, 2020
Space weather phenomena such as scintillations of Global Navigation Satellite Systems (GNSS) signals are of increasing importance for aviation, the maritime, and civil engineering industries.
A. Fæhn Follestad, L. B. N. Clausen, W. J. Miloch, J. van denIJssel, R. Haagmans   +4 more
doaj   +1 more source

PPP at Low Latitudes With Ionospheric Model Exclusively Based on Single Frequency GNSS Measurements

Space Weather, 2023
Single frequency users of the Global Navigation Satellite System (GNSS) should correct the ionospheric delay to obtain positioning solutions. A valuable source of ionospheric delay corrections is the global ionospheric models (GIMs) of Vertical Total ...
Ana L. Christovam, Fabricio S. Prol, Gabriel O. Jerez, Manuel Hernández‐Pajares, Paulo O. Camargo   +4 more
doaj   +1 more source

Dynamic Evolution of a Storm‐Time “Super‐EPB” Event Over China on the Magnetically Disturbed Night of 01 December 2023

Space Weather, Volume 24, Issue 10, October 2026.
Abstract This paper investigates the dynamic evolution of a storm‐time “Super‐EPB” event over China on 1 December 2023 (Kp ≤ 7, SYM/H ≥ −130 nT) using multi‐instrument observations. Occurring near sunset as the IMF‐Bz abruptly turned southward, with auroral extension to midlatitudes, the “Super‐EPB” extended to 40°N with an apex height of ∼2,460 km ...
Longchang Sun, Jiyao Xu, Wei Yuan, Yajun Zhu, Maosheng He, Wenjie Sun, Guozhu Li, Jiaojiao Zhang, Hong Gao, Aibin Zhang, Weijun Liu, Guojun Wang   +11 more
wiley   +1 more source

Analysis of the ionospheric scintillations during 20-21 January 2015 from SANAE by means of the DemoGRAPE scintillation receivers

, 2017
This paper presents ionospheric scintillation data recorded at SANAE in Antarctica during a moderate geomagnetic storm on 20-21 January 2016 which gives evidence of the advantages of the new generation of instrumentation for monitoring ionospheric ...
Cilliers, P. J., Cesaroni, Claudio, Linty, Nicola, Ward, J., De Franceschi, Giorgiana, Terzo, Olivier, Dovis, Fabio, Alfonsi, Lucilla, Romano, Vincenzo, Stephenson, J. A. E., Spogli, Luca, Hunstad, Ingrid   +11 more
core   +1 more source

Ionospheric Scintillation Induced by Hot Flow Anomalies via Particle Precipitation

AGU Advances, Volume 7, Issue 7, October 2026.
Abstract Ionospheric scintillation disrupts trans‐ionospheric radio signals and represents significant challenges for critical communication and navigation systems. Here we document that hot flow anomalies (HFAs), transient disturbances formed near Earth's bow shock, can contribute to scintillation near the cusp.
Jia‐Chen Zhao, Qing‐He Zhang, Zhong‐Wei Yang, Duan Zhang, Kjellmar Oksavik, Bo‐Yi Wang, Yu‐Zhang Ma, Zan‐Yang Xing, Yong Wang, Ling‐Xin Zhao, Xiang‐Yu Wang, Jin Guo, Shi‐Mou Wang, Cai‐Jun Yan, Bian‐Long Zhao, Hong‐Kai Zhang, Chang‐Yue Zhao   +16 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