The sudden increase of X-radiation and EUV emission following solar flares causes additional ionization increased absorption electromagnetic (EM) waves in the Earth’s atmosphere. flare impact on ionosphere above Europe 05 06 December 2006 was investigated using ground-based (ionosonde VLF) satellite-based data (Vertical Total Electron Content (VTEC) derived from GNSS observations VLF measuremen...

Abstract Ionospheric delay modeling is not only important for Global Navigation Satellite System (GNSS) based space weather study and monitoring, but also an efficient tool to speed up the convergence time of Precise Point Positioning (PPP). In this study, a novel model, denoted as Quasi-4-Dimension Modeling (Q4DIM) proposed wide-area high precision ionospheric correction. Q4DIM, Line Of Sight ...

The ionosphere research team of Xi'an University Science and Technology (XUST) has been committing to high-precision global ionospheric modeling since 2012. agency adopted spherical harmonic functions generate GNSS (Global Navigation Satellite System) product XANG multi-source data fusion XAMG. In this essay, we take International Service (IGS) maps (GIMs) products as a reference verify analyze...

Abstract For the purposes of routinely providing reliable and low-latency Global Ionosphere Maps (GIMs), a method estimating hourly updated near real-time GIM with time latency about 1–2 h based on 24-h data sliding window Navigation Satellite System (GNSS) observations streams was presented. On basis implementation estimation, an nowcasting further proposed to improve accurate short-term total...

The ionospheric response and the associated mechanisms to geomagnetic storms are very complex, particularly during February 2014 multiphase storm. In this paper, low-latitude ionosphere responses their coupling mechanisms, storm, investigated from ground-based magnetometers global navigation satellite system (GNSS), space weather data. residual disturbances between total electron content (TEC) ...

Ionospheric delay is one of the most problematic errors in satellite-based positioning data processing. The Global Map (GIM), which publicly available daily various analysis centers, thus vitally important for users. There are variations accuracy and consistency GIMs issued by Ionosphere Associate Analysis Centers (IAACs) due to differences ionospheric modeling methods selected tracking station...

The spatiotemporal variations and mechanisms of the ionospheric storms over American sector during August 2018 geomagnetic storm are investigated. One positive one negative occurred in North America two were observed South America. ionosphere showed prominent hemispheric asymmetries four storms. maximum VTEC (vertical total electron content) variation was more than 15 TECU about ?10 storm. GUVI...

Knowledge of the polar ionospheric total electron content (TEC) and its future variations is of scientific and engineering relevance. In this study, a new method is developed to predict Arctic mean TEC on the scale of a solar cycle using previous data covering 14 years. The Arctic TEC is derived from global positioning system measurements using the spherical cap harmonic analysis mapping method...