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Propagation characteristics analysis of high-frequency radio waves in the lower ionosphere layers.
Heliyon
December 2024
Laser and Plasma Research Institute, Shahid Beheshti University, Tehran, 1983969411, Iran.
In this article, the propagation of high-frequency (HF) plane electromagnetic waves through the lower ionosphere is numerically investigated using the real geometry of the Earth's magnetic field in the northern hemisphere. For this purpose, the profiles of electron density and the collision frequency in the layers of the lower ionosphere (D- and E-region) are considered using the reported experimental data for day and night. The reflection, transmission, and absorption coefficients of HF radio waves in the frequency range of 3 to 30 MHz are calculated in the ionosphere plasma.
View Article and Find Full Text PDFNighttime ionospheric irregularity during intense geomagnetic storm events over the Europe-African longitudinal sector.
Heliyon
October 2024
College of Science, Department of Physics, Washera Geospace and Radar Science Research Laboratory (WaGRL), Bahir Dar University, Ethiopia.
Radio communication and navigation systems can be severely impacted by irregularities in the ionosphere. There is still much to learn about how geomagnetic storms affect the occurrence of these irregularities. Ionosphere studies in different regions, particularly the equatorial and low-latitudes, are necessary to enhance the forecasting of this phenomenon.
View Article and Find Full Text PDFSensitivity of Band-Pass Filtered In Situ Low-Earth Orbit and Ground-Based Ionosphere Observations to Lithosphere-Atmosphere-Ionosphere Coupling Over the Aegean Sea: Spectral Analysis of Two-Year Ionospheric Data Series.
Sensors (Basel)
December 2024
Faculty of Geoengineering, University of Warmia and Mazury in Olsztyn, Ul. Oczapowskiego 2, 10-719 Olsztyn, Poland.
This study demonstrates a rich complexity of the time-frequency ionospheric signal spectrum, dependent on the measurement type and platform. Different phenomena contributing to satellite-derived and ground-derived geophysical data that only selected signal bands can be potentially sensitive to seismicity over time, and they are applicable in lithosphere-atmosphere-ionosphere coupling (LAIC) studies. In this study, satellite-derived and ground-derived ionospheric observations are filtered by a Fourier-based band-pass filter, and an experimental selection of potentially sensitive frequency bands has been carried out.
View Article and Find Full Text PDFArticle Synopsis
- This study analyzes the response of the Brazilian ionosphere to geomagnetic storms driven by Corotating Interaction Regions (CIR) and High-Speed Solar Wind Streams (HSS) during 2016-2017.
- It investigates Vertical Total Electron Content (VTEC) variations across three regions: equatorial, northern crest, and southern crest of the Equatorial Ionization Anomaly, noting both enhancements and depletions of up to 30 and 20 TECu, respectively.
- The research also highlights the timing of these variations, the role of electric fields in the ionosphere, and includes new catalogs for low-latitude ionospheric storms useful for space weather and modeling.
One of the most intense geomagnetic storms of recent times occurred on 10-11 May 2024. With a peak negative excursion of Sym-H below -500 nT, this storm is the second largest of the space era. Solar wind energy transferred through radiation and mass coupling affected the entire Geospace.
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