Results 71 to 80 of about 2,679 (211)

Diurnal Variation of TEC and S 4 Index During the Period of Low Geomagnetic Activity at Ile-Ife, Nigeria [PDF]

, 2016
Ile-Ife lies on the equatorial anomaly region where the ionospheric current is greatly influenced by the existence of the equatorial electrojet. The dual frequency SCINDA NovAtel GSV 4004B GPS receiver recently installed at Ile-Ife [on geographical ...
Ariyibi, E. A., Coster, Anthea J., Doherty, P., Joshua, E. O.   +3 more
core   +1 more source

Enhancing Low‐Latitude Ionospheric Irregularity Prediction With Generalized Linear Models

Space Weather, Volume 24, Issue 3, March 2026.
Abstract The ionosphere poses challenges for accurate forecasting due to its complexity and variability. Irregularities in the lower ionosphere are influenced by local time, season, geographic location, solar activity and space weather, complicating precise predictions.
Alysson Brhian, Marco A. Ridenti, Francisco Azpilicueta, Mauricio Gende, Marisa Roberto   +4 more
wiley   +1 more source

Study of spatial and temporal characteristics of L-band scintillations over the Indian low-latitude region and their possible effects on GPS navigation [PDF]

Annales Geophysicae, 2006
The scintillation data (S4-index) at the L-band frequency of 1.575GHz, recorded from a total of 18 GPS receivers installed at different locations in India under the GAGAN project, have provided us with a unique opportunity, for the first time in the ...
P. V. S. Rama Rao, S. Gopi Krishna, K. Niranjan, D. S. V. V. D. Prasad   +3 more
doaj   +1 more source

Strong Polar Ionospheric Electron Density Depletion Under Prolonged Northward IMF Bz Condition

Earth and Space Science, Volume 13, Issue 3, March 2026.
Abstract Previous studies have primarily focused on high‐latitude ionospheric‐thermospheric (I‐T) variabilities under southward interplanetary magnetic field (IMF) conditions, while rare studies have investigated the I‐T responses to due northward Bz (NBz), especially in the presence of strong IMF By conditions.
Tianyu Cao, Yifan Lu, Jing Liu, Shuhan Li   +3 more
wiley   +1 more source

Global Ionospheric Scintillation Estimation Based on Phase Screen Modeling From One‐Dimensional Satellite Data

Space Weather
Ionospheric scintillations, which usually manifest as sudden, rapid fluctuations in radio wave signal phase and amplitude, challenge the reliability of satellite communication and navigation.
Yuhao Zheng, Chao Xiong, Luca Spogli, Rayan Iman, Lucilla Alfonsi   +4 more
doaj   +1 more source

Equatorial scintillations in relation to the development of ionization anomaly [PDF]

Annales Geophysicae, 2006
The irregularities in the electron density distribution of the ionosphere over the equatorial region frequently disrupt space-based communication and navigation links by causing severe amplitude and phase scintillations of signals.
S. Ray, A. Paul, A. DasGupta, A. DasGupta   +3 more
doaj   +1 more source

The Evolution of a Polar Cap Patch Into a Blob in the Nightside Ionosphere: Direct Observations of Multiple Blob Formation Mechanisms Acting Simultaneously on the Same Plasma

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract A polar cap patch was observed to exit the polar cap to become a blob as it entered the auroral oval on the nightside of the Earth under moderately quiet geomagnetic conditions (Kp = 3−). Auroral particle precipitation led to an increase in the electron density of the blob.
S. J. Maguire, A. G. Wood, D. R. Themens, E. M. Henley, S. E. Milan, Y. Soobiah, K. Oksavik, W. J. Miloch, J. C. Coxon, M. G. Johnsen   +9 more
wiley   +1 more source

Tackling ionospheric scintillation threat to GNSS in Latin America

Journal of Space Weather and Space Climate, 2011
Scintillations are rapid fluctuations in the phase and amplitude of transionospheric radio signals which are caused by small-scale plasma density irregularities in the ionosphere.
Monico Joao Francisco Galera, Bougard Bruno, Romano Vincenzo, Spogli Luca, Alfonsi Lucilla, De Franceschi Giorgiana, Hancock Craig, Elmas Zeynep, Forte Biagio, Aquino Marcio, Sreeja Vadakke Veettil, Wernik Andrzej W., Sleewaegen Jean-Marie, Cantó Andrea, Ferreira Da Silva Elcia   +14 more
doaj   +1 more source

Multi-Instrument Observations of a Geomagnetic Storm and its Effects on the Arctic Ionosphere: A Case Study of the 19 February 2014 Storm:Observations of a Geomagnetic Storm [PDF]

, 2017
We present a multiinstrumented approach for the analysis of the Arctic ionosphere during the 19 February 2014 highly complex, multiphase geomagnetic storm, which had the largest impact on the disturbance storm-time index that year.
Alfonsi, Anderson, Anthony J. Mannucci, Attila Komjathy, Basu, Basu, Bhattacharyya, Blagoveshchenskii, Brekke, Buonsanto, Coker, Davies, Deng, Doherty, Durgonics, Emmert, Esayas B. Shume, Feldstein, Ghamry, Giraud, Gonzalez, Hans-Henrik Benzon, Hatch, Heelis, Hernandez-Pajares, Jacobsen, Jakowski, Kersley, Khazanov, Komjathy, Komjathy, Lastovicka, Le, Liemohn, Maini, Mannucci, Mannucci, Mark D. Butala, Matuura, Meier, Mendillo, Mendillo, Olga Verkhoglyadova, Paxton, Per Høeg, Pi, Prikryl, Prölls, Prölls, Richard B. Langley, Richmond, Rodger, Schunk, Sibson, Thomas, Tibor Durgonics, Tsurutani, Vennerstrøm, Vergados, Verkhoglyadova, Vickrey, Wei, Yau, Yau, Zhang   +64 more
core   +2 more sources

Equatorial Ionospheric Scintillation During Daytime

Eos, 2018
Scintillation—flickers and distortions in radio waves passing through the ionosphere—can happen during daytime and at much lower dip latitudes than previously thought.
openaire   +1 more source