Results 71 to 80 of about 1,219 (180)

Worst cases for a one-hop high frequency link [PDF]

, 2002
The characterisation of a HF channel by means of monthly electron density profiles can be complemented with a detailed study of radio propagation «worst cases» on situations with extremes conditions of radiopropagation for a given period.
Herraiz, Miguel, Miró Amarante, Gloria, Morena Carretero, Benito A de la, Radicella, Sandro María   +3 more
core   +2 more sources

Ionospheric Density Variations Observed by the Radio Receiver Instrument on e‐POP/Swarm‐E

Journal of Geophysical Research: Space Physics, Volume 130, Issue 11, November 2025.
Abstract Ionospheric density variations can be inferred by studying the effects of electron density structures on transionospheric High Frequency (HF) radio wave propagation. The Radio Receiver Instrument (RRI) on the Enhanced Polar Outflow Probe (e‐POP)/Swarm‐E is used to detect HF radio waves during transionospheric experiments conducted between the ...
E. C. Kalafatoglu Eyiguler, D. W. Danskin, G. C. Hussey, R. G. Gillies, A. G. Burrell, A. J. Coster, K. Pandey, A. W. Yau   +7 more
wiley   +1 more source

Auroral Ionosphere Responses to Solar Wind Perturbations: A Case Study Utilizing the Polar Regions Monitoring Subsystem of the Chinese Meridian Project

Space Weather, Volume 23, Issue 11, November 2025.
Abstract The Earth's polar regions serve as a natural conduit for solar wind energy and momentum, transferring this energy into the geospace and driving complex magnetosphere‐ionosphere‐thermosphere coupling processes that have significant global space weather and space climate impacts.
Jianjun Liu, Fang He, Xiangcai Chen, Bin Li, Lin Zheng, Xingxin Zhao, Ziyuan Zhu, Zejun Hu, Dehong Huang, Hongqiao Hu   +9 more
wiley   +1 more source

Multi‐Instrument Investigation of the Pre‐Seismic Ionospheric Response to 2021 Haiti Earthquake

Earth and Space Science, Volume 12, Issue 10, October 2025.
Abstract The study of pre‐seismic variations in the ionosphere due to 2021 Haiti earthquake (Mw = 7.2) is carried out using ground and space‐based instruments. The day time ionospheric response is analyzed using Vertical Total Electron Content (VTEC) from IGS stations and electron density from Swarm satellite data.
Sreeba Sreekumar, G. Manju, Tarun K. Pant   +2 more
wiley   +1 more source

Exploring Two‐Dimensional and Three‐Dimensional Propagation of Large‐Scale Traveling Ionospheric Disturbances During the May 2024 Geomagnetic Storm Main Phase

Space Weather, Volume 23, Issue 10, October 2025.
Abstract During the main phase of the May 2024 super geomagnetic storm, we investigated large‐scale traveling ionospheric disturbances (LSTID) using data from densely distributed global GNSS receivers. From both two‐dimensional and three‐dimensional (3D) perspectives, we analyzed LSTID propagation characteristics over North America, European, and ...
Ting Zhang, Yunbin Yuan, Xingliang Huo, Min Li, Kaixin Wang   +4 more
wiley   +1 more source

Сезонные наблюдения ионосферы с помощью ионозонда “Базис” Института ионосферы [PDF]

, 2012
В работе представлены результаты сезонных наблюдений ионосферы методом вертикального зондирования с помощью ионозонда “Базис” (Харьков). Проведено их сравнение с данными дигизондов DPS-4 в Прухонице (Чехия) и Дурбесе (Бельгия), расположенных на близкой ...
Емельянов, Л. Я., Кононенко, А. А.   +1 more
core  

Unique Signatures of Meridional Wind Variations on the Electron Density Distribution Over the Dip Equator

Geophysical Research Letters, Volume 52, Issue 18, 28 September 2025.
Abstract We investigate unusual daytime enhancement and undulations observed in Vertical Total Electron Content (VTEC) during the extreme G5 geomagnetic storm on 11 May 2024 over the dip equatorial station Trivandrum, India using a physics‐based ionospheric model.
Arya Ashok, K. M. Ambili, R. K. Choudhary, Gang Lu   +3 more
wiley   +1 more source

Retrieval of thermospheric parameters from routinely observed F2-layer Ne(h) profiles at the geomagnetic equator

Journal of Space Weather and Space Climate, 2013
A principal possibility to retrieve basic thermospheric parameters (neutral temperature Tex, atomic [O] and molecular [O2] oxygen as well as molecular nitrogen [N2] concentrations) from the observed daytime electron density profiles Ne(h) in the ...
Zolesi Bruno, Perrone Loredana, Belehaki Anna, Mikhailov Andrei, Tsagouri Ioanna   +4 more
doaj   +1 more source

Simultaneous observations of irregular sporadic E structures using the LWA and a DPS4D

Frontiers in Astronomy and Space Sciences
Multi-instrument studies have recently shed new light on the morphology of sporadic E, especially intense sporadic E. Here we present simultaneous observations of dense sporadic E (Es) structures using the Long Wavelength Array (LWA) radio telescopes and
K. S. Obenberger, C. A. Taylor, J. J. Colman, E. Dao, J. Dowell, J. V. Eccles, D. J. Emmons, C. T. Fallen, J. M. Holmes, G. B. Taylor   +9 more
doaj   +1 more source

Correlation in f0F2 and M(3000) F2 variations in South-West Europe

Annals of Geophysics, 1996
A statistical analysis of the variations of the hourly daily values of the M(3000)F2 with the corresponding values of critical frequencies f0F2 was provided for two similar ionosondes (Digisonde-256) located in El Arenosillo and Geophysical Observatory ...
E. S. Kazimirovsky, J. M. Vilaplana, L. F. Alberca, J. G. Sole, B. A. de la Morena   +4 more
doaj   +1 more source