Results 31 to 40 of about 723 (151)

Interplanetary magnetic field directions inferred from Digisonde measurements of the convection flow direction over the polar cap

, 1992
The interplanetary magnetic field (IMF) exerts a strong influence on high latitude F-region convection and, therefore, the IMF is an important input parameter in models of the high latitude ionosphere.
Reinisch, B.W., Cannon, P.S.; id_orcid, Buchau, J.   +2 more
core   +3 more sources

A comparison of Ne (h) model profiles with ground-based and topside sounder observations

Annals of Geophysics, 2000
Monthly median empirical models IRI-95 and NeUoG were compared with incoherent scatter EISCAT and Millstone Hill observations as well as with El Arenosillo Digisonde N e (h) bottomside profiles.
V. K. Depuev, G. Miro, T. Y. Leschinskaya, A. V. Mikhailov   +3 more
doaj   +1 more source

One-step ahead prediction of foF2 using time series forecasting techniques [PDF]

Annales Geophysicae, 2005
In this paper the problem of one-step ahead prediction of the critical frequency (foF2) of the middle-latitude ionosphere, using time series forecasting methods, is considered.
K. Koutroumbas, A. Belehaki
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

Anomalous Ionogram Traces over European Mid-Latitudes: Climatology and Association with Travelling Ionospheric Disturbances

Atmosphere
Anomalous ionogram traces are characteristic ionogram signatures, appearing as split, branching, cusp, U-, sickle-, and crescent-shaped structures in the F-region trace, that are commonly associated with travelling ionospheric disturbances (TIDs) and TID-
Blessy Varghese, Krishnendu Sekhar Paul, Ankitha Nandakumar, Ola Abu Elezz, Haris Haralambous, Tiju Joseph Mathew   +5 more
doaj   +1 more source

Diurnal, seasonal, annual, and semi-annual variations of ionospheric parameters at different latitudes in East Asian sector during ascending phase of solar activity

Solar-Terrestrial Physics, 2017
We analyzed ionospheric parameters including the critical frequency of the F2 layer (foF2), the peak height of the F2 layer (hmF2), and the scale height at hmF2 (HT) from 2006 to 2012 (ascending phase of solar activity) at Hainan (19.5° N, 109.1° E, MLat.
Wang Zheng, Shi Jiankui, Wang Guojun, Wang Xiao, Zherebtsov G.A., Romanova E.B., Ratovsky K.G., Polekh N.M.   +7 more
doaj   +1 more source

Equatorial F‐Region Responses to the Main Phase of the 10 May 2024 Geomagnetic Storm Over the South American Sector: Observations and Model Simulations

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract This study examines the equatorial ionospheric response over the South American sector during the onset of the extreme 2024 Mother's Day geomagnetic storm, which began at ∼17 UT on 10 May and reached the G5 level. Pronounced disturbances in ionospheric electrodynamics were observed under both daytime and nighttime conditions. Variations in the
A. M. Santos, J. R. Souza, I. S. Batista, M. Bravo, C. G. M. Brum, J. H. A. Sobral, S. S. Chen, R. Sá, L. C. A. Resende, J. Moro, P. R. Jauer, L. da Silva, D. Medeiros, P. A. B. Nogueira, E. A. Kherani, V. F. Andrioli, M. A. Abdu, G. S. Adeniran, R. de Jesus, A. A. Pimenta, G. Yang, F. A. de Souza   +21 more
wiley   +1 more source

"GPS TEC and ITEC from digisonde data compared with NEQUICK model"

, 2021
At the Dourbes station, a digisonde 256 is colocated with a Turbo Rogue GPS receiver. Real time processing of the digisonde data gives the electron density profile and the ITEC value (SAO file) for each sounding.
Warnant, R., Jodogne, J.-C., Nebdi, H.
core  

Optimization Algorithms for Retrieving the Bottomside Ionospheric B0 and B1 Parameters

Radio Science, Volume 61, Issue 10, October 2026.
Abstract The bottomside morphological parameters of the ionospheric F2 layer, the thickness parameter B0 and the shape parameter B1, are crucial for describing electron density profiles and monitoring space weather. However, existing climatological models and indirect ionosonde approaches have limitations in real‐time applicability and direct ...
Cheng Wang, Xiaoyu Zhu, Zhen Li
wiley   +1 more source

Case Studies on the Day‐to‐Day Variability in the Occurrence of Post‐Sunset Equatorial Spread F

Space Weather, 2022
The occurrence of post‐sunset equatorial spread F (ESF) is well understood to be associated with the evening pre‐reversal enhancement (PRE). Earlier studies have shown that when large datasets are examined, there is a significant correlation between the ...
B. Olugbon, E. O. Oyeyemi, A. Kashcheyev
doaj   +1 more source