Results 41 to 50 of about 950 (162)

Doppler vertical sounding of the ionosphere at the Akademik Vernadsky station

Український антарктичний журнал, 2020
The paper aims at providing the technical information about Doppler vertical sounding of the ionosphere that started at the Ukrainian Antarctic Akademik Vernadsky station since 2017; developing the technique for processing and visualization of data of ...
A. Zalizovski, O. Koloskov, A. Kashcheyev, S. Kashcheyev, Y. Yampolski, O. Charkina   +5 more
doaj   +1 more source

The Real‐Time Advanced Ionospheric Data Assimilation (AIDA) Model

Space Weather, Volume 24, Issue 2, February 2026.
Abstract The Advanced Ionospheric Data Assimilation (AIDA) is a real‐time data assimilation model of global 3D ionosphere and plasmasphere electron density. Changes in the local space environment can occur on very short timescales, particularly during disturbed geomagnetic conditions.
Benjamin Reid, David R. Themens, Sean Elvidge, Mohammad Afraz Ahmed, Warrick Ball, M. Mainul Hoque   +5 more
wiley   +1 more source

Diagnostics of HF radio channel: based on data from backscatter ionospheric sounding by continuous chirp signal

Solar-Terrestrial Physics, 2018
Backscatter ionospheric sounding (BIS) is a powerful tool for monitoring and predicting conditions of operation of HF communication systems. The BIS method is adopted to determine coverage areas of radio waves and maximum usable radio frequencies ...
Ponomarchuk S.N., Grozov V.P., Kotovich G.V., Kurkin V.I., Penzin M.S.   +4 more
doaj   +1 more source

Some aspects of large-scale travelling ionospheric disturbances which originate at conjugate locations in auroral zones, cross the equator and sometimes encircle the earth [PDF]

Annales Geophysicae, 2011
The occurrence of large-scale travelling ionospheric disturbances (LS-TIDs) has been examined. Initially some literature on their generation is considered.
G. G. Bowman, I. K. Mortimer
doaj   +1 more source

Signature of Y-forking in ionogram traces observed at low-mid latitude Indian station, New Delhi, during the earthquake events of 2020: ionosonde observations

Frontiers in Astronomy and Space Sciences, 2023
We have examined ionospheric response to eleven earthquake events measuring less than four on the Richter scale during the year 2020 that occurred in the vicinity of New Delhi (28.6°N, 77.2°E, 42.4°N dip).
Arti Bhardwaj, Arti Bhardwaj, Ankit Gupta, Ankit Gupta, Qadeer Ahmed, Qadeer Ahmed, Anshul Singh, Anshul Singh, Sumedha Gupta, S. Sarkhel, M. V. Sunil Krishna, Duggirala Pallamraju, Tarun Pant, A. K. Upadhayaya   +13 more
doaj   +1 more source

IRI-2012 MODEL ADAPTABILITY ESTIMATION FOR AUTOMATED PROCESSING OF VERTICAL SOUNDING IONOGRAMS [PDF]

Научно-технический вестник информационных технологий, механики и оптики, 2014
The paper deals with possibility of IRI-2012 global empirical model applying to the vertical sounding of the ionosphere semiautomatic data processing.
V. D. Nikolaeva , M. V. Rybakov, A. L. Kotikov, V. K. Koshelevsky   +3 more
doaj  

Numerical simulation of the propagation of electromagnetic waves in ionospheric irregularities

Earth and Planetary Physics, 2020
The characteristics of high-frequency (HF) electromagnetic (EM) wave propagation can be affected when EM waves propagate in the ionosphere. When ionospheric irregularities appear in the ionosphere, they can have a serious impact on the propagation of HF ...
ChunHua Jiang, LeHui Wei, GuoBin Yang, Chen Zhou, ZhengYu Zhao   +4 more
doaj   +1 more source

A new inversion algorithm for backscatter ionogram and its experimental validation [PDF]

Annales Geophysicae, 2014
Oblique backscatter sounding is a powerful tool for detecting and monitoring the ionosphere continuously at a remote distance. High-frequency (HF) backscatter ionograms provide the amplitudes of backscatter signals with respect to group path or time ...
J. J. Zhao, C. Zhou, G. B. Yang, C. H. Jiang, S. S. Chang, P. Zhu, X. D. Gu, B. B. Ni, Z. Y. Zhao   +8 more
doaj   +1 more source

The First Results of Ionospheric Skywave Propagation Experiment Over Taiwan

Radio Science, Volume 61, Issue 1, January 2026.
Abstract An ionospheric over‐the‐horizon propagation experiment was carried out in Taiwan to investigate characteristics of ionospheric F layer skywave propagation at frequencies 4–12 MHz. Experimental results show that there are prominent diurnal variations in the incident angle, virtual height and plasma frequency at reflection height, which are ...
Hung‐Shi Lin, Ching‐Lun Su, Kang‐Hung Wu, Yen‐Hsyang Chu   +3 more
wiley   +1 more source

A Deep Learning Approach for Automatic Ionogram Parameters Recognition With Convolutional Neural Networks

Earth and Space Science
Typical ionosondes operate with >5 min time intervals, which is enough to obtain regular parameters of the ionosphere, but insufficient to observe short‐term processes in the Earth's ionosphere.
Ruslan Sherstyukov, Samson Moges, Alexander Kozlovsky, Thomas Ulich   +3 more
doaj   +1 more source