Radio interferometers, which are designed to observe astrophysical objects in the universe, can also be used study Earth's ionosphere. interferometers like Giant Metrewave Telescope (GMRT) detect variations ionospheric total electron content (TEC) on a much wider spatial scale at relatively higher sensitivity than traditional probes Global Navigation Satellite System (GNSS). The hybrid configur...

Abstract Traveling ionospheric disturbances (TIDs) were observed over Japan by using Global Navigation Satellite System (GNSS) receiver network data after the eruption of Hunga Tonga-Hunga Ha’apai in Tonga on 15 January 2022. Two types TIDs with different characteristics as perturbation total electron content (TEC). The first one arrived at which are located about 7800 km away from 3 h eruption...

Global navigation satellite system signals are known to be an efficient tool monitor the Earth ionosphere. We suggest Galileo E5 AltBOC phase and pseudorange observables—a single-frequency combination—to estimate ionospheric total electron content (TEC). performed a one-month campaign in September 2020 compare noise level for different TEC estimations based on dual-frequency data. Unlike GPS, G...

In this paper, we presented the effect of moderate geomagnetic storms on TEC variation at Koudougou station (Geo Lat 12° 15 ′ N; Geo Long: -2° 20 id="M2"> E) in Burkina Faso (Africa) during descending phase solar cycle 24. For purpose, four without storm sudden commencement (SSC) or impulse (SI) that occurred May 13, 201...

This work conducts a focused study of subauroral ion-neutral coupling processes and midlatitude ionospheric/thermospheric responses in North America during minor but quite geo-effective storm on September 27–28, 2019 under deep solar minimum conditions. Several prominent storm-time disturbances associated electrodynamics/dynamics were identified comprehensively analyzed using Millstone Hill Pok...

The ionospheric total electron content (TEC) is an important parameter, and it widely utilized in research such as space weather prediction precise positioning. However, still challenging to develop TEC model with high accuracy. In this study, a new over China was developed using the bidirectional long short-term memory (bi-LSTM) method observations from 257 ground-based global navigation satel...

During geomagnetic storms, ionospheric storms can be driven by several mechanisms. Observations performed using ground- and space-based instruments were used to reveal the driver of positive storm over South American sector during 4 November 2021 storm. The appeared from 10:30 UT 18:00 covered region 40°S 20°N. maximum magnitudes TEC (Total Electron Content) enhancement relative about 20 TECU 1...

Current GNSS receivers have independent Phase Locked Loops (PLLs) for each satellite and frequency. The introduction of new GPS signals on L5 and the development of new satellite constellations (Galileo, Compass) increases the number of PLLs and, thus, the probability of a loss of lock of one PLL. This probability becomes especially critical during ionospheric scintillations with frequent deep ...

Understanding the ionospheric variability caused by solar and geomagnetic space weather can be achieved using Total Electron Content (TEC) parameter. Developing a novel artificial intelligence-based machine learning model that forecast TEC parameter would primarily benefit Global Positioning System (GPS) users. This paper holds one such hybrid empirical exploits nonlinear autoregressive neural ...