Results 61 to 70 of about 4,627 (227)

Evaluating the IRI topside model for the South African region: An overview of the modelling techniques [PDF]

, 2009
The representation of the topside ionosphere (the region above the F2 peak) is critical because of the limited experimental data available. Over the years, a wide range of models have been developed in an effort to represent the behaviour and the shape ...
McKinnell, L-A, Sibanda, P
core   +1 more source

Topside Ionospheric Ambipolar Diffusion Derived From ICON Observations

Geophysical Research Letters, Volume 53, Issue 3, 16 February 2026.
Abstract The scarcity of ambipolar diffusion observations has constrained our understanding of ionospheric physical processes. We present the first comprehensive analysis of topside ionospheric ambipolar diffusion using the difference between the field‐aligned ion drifts and neutral winds observed by the Ionospheric Connection Explorer (ICON) satellite.
Rongjin Du, Libo Liu, Ruilong Zhang, Wenbo Li, Jing Liu, Bowei Liu, Yiding Chen, Han Ma, Huijun Le   +8 more
wiley   +1 more source

Nonlinear VLF effects in the topside ionosphere [PDF]

Geophysical Research Letters, 2010
The Demeter satellite observed intense broadband lower‐ and upper‐hybrid electrostatic waves and plasma perturbations associated with high‐power whistler‐mode signals from the very‐low frequency (VLF) transmitter NWC. This paper shows that the Demeter observations can be explained by nonlinear interactions driven by VLF pump waves, thereby suggesting ...
E. V. Mishin, M. J. Starks, G. P. Ginet, R. A. Quinn   +3 more
openaire   +1 more source

Evaluation of COSMIC‐2 Satellite Data for foF2 and hmF2 Against Ground‐Based Ionosondes and the PyIRI (2020) Model Across Middle to Low Latitudes

Space Weather, Volume 24, Issue 2, February 2026.
Abstract This study presents a comprehensive evaluation of COSMIC‐2 satellite‐derived ionospheric peak parameters (foF2 and hmF2) against ground‐based ionosonde observations and a comparative analysis with PyIRI (2020) model estimates across middle to low latitudes for the period 2020–2024.
Ephrem Beshir Seba, Carla Jacobs, Matthieu Melcot, Stefaan Poedts   +3 more
wiley   +1 more source

Ionosphere‐Thermosphere Coupling in the Northern Polar Region During the May 2024 Geomagnetic Superstorm

Journal of Geophysical Research: Space Physics, Volume 131, Issue 2, February 2026.
Abstract The May 2024 superstorm, as the most intense geomagnetic storm since 2003, caused a variety of disturbances in the magnetosphere‐ionosphere‐thermosphere system. This study investigates the long‐lasting electron density depletion in the polar region and the underlying ionosphere‐thermosphere coupling, based on a comprehensive set of ...
Lei Cai, Anita Aikio, G. P. Geethakumari, Heikki Vanhamäki, I. I. Virtanen, Shin‐ichiro Oyama, Yongliang Zhang, Jiaojiao Zhang, Marc Hairston   +8 more
wiley   +1 more source

The Ionospheric Lunar Tidal Response to the 2020–2021 Sudden Stratospheric Warming Observed by COSMIC‐2, ICON and Modeled by SD‐WACCMX, TIE‐GCM

Journal of Geophysical Research: Space Physics, Volume 131, Issue 2, February 2026.
Abstract This study examines how the breakdown of the stratospheric polar vortex influences lunar semidiurnal (M2) tides in F‐region electron density using Global Ionospheric Specification (GIS) data from the Constellation Observing System for Meteorology, Ionosphere, and Climate‐2 (COSMIC‐2).
Deepali Aggarwal, Sunil Kumar, B. C. Martinez, Nicholas Pedatella, Xian Lu, Jens Oberheide   +5 more
wiley   +1 more source

Forecasting Local Ionospheric Parameters Using Transformers

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 1, February 2026.
Abstract We present a novel method for forecasting key ionospheric parameters using transformer‐based neural networks. The model provides accurate forecasts and uncertainty quantification of the F2‐layer peak plasma frequency (foF2), the F2‐layer peak density height (hmF2), and total electron content for a given geographic location.
D. J. Alford‐Lago, C. W. Curtis, A. T. Ihler, D. P. Drob, K. A. Zawdie   +4 more
wiley   +1 more source

The applicability of existing topside ionospheric models to the South African region

South African Journal of Science, 2009
The modelling of the electron density profile (Ne) for the topside ionosphere is challenging due to the limited availability of measured data. Over the past few years, a range of approaches to topside ionospheric modelling and representation of the Ne ...
P. Sibanda, L.A. McKinnell
doaj  

Positive ionospheric storm effects at Latin America longitude during the superstorm of 20–22 November 2003: revisit [PDF]

Annales Geophysicae, 2012
Positive ionospheric storm effects that occurred during the superstorm on 20 November 2003 are investigated using a combination of ground-based Global Positioning System (GPS) total electron content (TEC), and the meridian chain of ionosondes ...
B. Zhao, B. Zhao, W. Wan, J. Lei, Y. Wei, Y. Sahai, B. Reinisch, B. Reinisch   +7 more
doaj   +1 more source

Electon density profiles of the topside ionosphere

Annals of Geophysics, 2002
The existing uncertainties about the electron density profiles in the topside ionosphere, i.e., in the height region from h m F 2 to ~ 2000 km, require the search for new data sources. The ISIS and Alouette topside sounder satellites from the sixties to the eighties recorded millions of ionograms but most were not analyzed in terms of electron density ...
D. Bilitza, B. W. Reinisch, X. Huang, R. F. Benson   +3 more
openaire   +3 more sources