Results 71 to 80 of about 1,807 (203)

Automatic scaling of critical frequency foF2 and MUF(3000)F2: A comparison between Autoscala and ARTIST 4.5 on Rome data

, 2007
The performances of Autoscala and ARTIST 4.5 were comparatively evaluated using a large database of 6098 ionograms recorded from September 2005 to June 2006 by the digisonde DPS4 at the Rome ionospheric station.
Scotto, C., Pezzopane, M.
core   +1 more source

PyRayHF: An Open Source Ray‐Tracing Forward Operator for Assimilating Oblique Ionograms

Radio Science, Volume 61, Issue 8, August 2026.
Abstract Oblique high‐frequency (HF) ionospheric measurements contain valuable information about electron density structure, but remain difficult to assimilate operationally due to the computational cost of ray tracing. PyRayHF is an open‐source, fully Python‐based framework that addresses such difficulties through the implementation of efficient ...
Victoriya V. Forsythe, Henry C. Valentine, Douglas P. Drob, Joseph Hughes, Dustin Hickey, Angeline G. Burrell, Katherine A. Zawdie, Dev Raj Joshi, William Bristow, Evan G. Thomas   +9 more
wiley   +1 more source

The Reduction of Ionograms from the Bottomside and Topside Scientific Report No. 230 [PDF]

, 1965
Reduction of ionograms to electron density height profiles on digital ...
Doupnik, J. R., Schmerling, E. R.
core  

Accuracy comparison of ionogram inversion methods

Advances in Space Research, 1994
Results obtained with a new inversion method /1/ have been compared with the inversions as given by the ARTIST approach /2/. Future generalizations are suggested.
openaire   +2 more sources

Physics‐Embedded Deep Learning Reveals the Memory Effect of Ionospheric Electron Density in Response to Solar EUV Forcing

Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.
Abstract Precise characterization of the electron density profile is crucial for optimizing high frequency communications. Reconstruction models often assume an instantaneous ionospheric response to solar forcing or using time delays, neglecting the time‐integrated cumulative “memory effect” of plasma dynamics.
Hongwei Gong, Hanxian Fang, Die Duan, Chao Xiao, Jintai Li, Chenghao Li, Hongtao Huang, Ganming Ren, Chuyue Zhou, Han Wu   +9 more
wiley   +1 more source

Ionospheric echoes detection in digital ionograms using convolutional neural networks [PDF]

, 2019
An ionogram is a graph that shows the distance that a vertically transmitted wave, of a given frequency, travels before returning to the earth. The ionogram is shaped by making a trace of this distance, which is called virtual height, against the ...
De la Jara Sánchez, César
core  

Observations of ionospheric disturbances via U-shaped traces on ionograms

Геодинамика и тектонофизика, 2019
The ionospheric vertical sounding is a basic technique for studying the Earth’s ionosphere. Taking into account the fact that conditions for propagation of radio waves depend on the operating frequency, diagnostics of the ionosphere is performed using ...
O. A. Laryunin
doaj   +1 more source

Direct Observations of Large‐Scale Wave Structure and Post‐Sunset Rise of the Ionosphere in the Generation of Equatorial Spread F

Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.
Abstract Large‐scale wave structure (LSWS) and the post‐sunset rise (PSSR) are two key factors in the generation of equatorial spread F (ESF). In this study, we reported continuous and direct observations of LSWS and PSSR and their effects on seeding ESF by Sanya incoherent scatter radar (SYISR) and ionosonde in September–October 2024.
Qi Jiang, Jiuhou Lei, Xinan Yue, Fuqing Huang, Rong Xia, Tong Dang, Xiaoli Luan   +6 more
wiley   +1 more source

Evidence and Causes of an Unusual Super Plasma Bubble Occurrence During Weak Geomagnetic Conditions Over Europe

Space Weather
Using data from a cluster of ground‐based global navigation satellite system, we observed spatially extended enhanced ROTI over the European longitudes during a weak geomagnetic storm (Dst ≈ −50 nT) on 4 November 2023.
Chandan Kapil, Mani Sivakandan, Jorge Chau, Gopi K. Seemala, David Altadill   +4 more
doaj   +1 more source

Application of Autoscala to ionograms recorded by the AIS-Parus ionosonde

, 2010
Autoscala was applied to ionograms recorded by the digital AIS-Parus ionosonde, built at the Pushkov Institute of Terrestrial Magnetism,Ionosphere and Radiowave Propagation, Russia, and installed in Moscow (55.5N,37.5E).
Scotto, C., Krasheninnikov, I., Pezzopane, M., M. Pezzopane, C. Scotto, I. Krasheninnikov   +5 more
core   +1 more source