Ionospheric modeling across the Indian low latitudes continues to be a challenging task because of day-to-day variability pertaining underlying complex equatorial and latitude electrodynamics. In this paper, we aimed at developing an ionospheric Total Electron Content (TEC) model based on Singular Spectrum Analysis (SSA) using Global Positioning System (GPS)-TEC observations (from 2009 2019) Be...

[1] We use the Global Ionosphere-Thermosphere Model (GITM) to simulate the ionospheric reaction to a simple step change of the high-latitude forcing terms during the first hour of electric field enhancement. In response to the enhanced convection electric field, both the convection velocity and Joule heating increase dramatically. The changes in NmF2 present that the tongue extends across the p...

Abstract The effects of physical events on the ionosphere structure is an important field study, especially for navigation and radio communication. paper presents spatio-temporal ionospheric TEC response to recent annular solar eclipse June 21, 2020, which spans across two continents, Africa Asia, 14 countries. This took place same day as Solstice. Global Navigation Satellite System (GNSS) base...

Abstract. The Real-Time Working Group (RTWG) of the International GNSS Service (IGS) is dedicated to providing high-quality data and high-accuracy products for Global Navigation Satellite System (GNSS) positioning, navigation, timing Earth observations. As one part real-time products, IGS combined Ionosphere Map (RT-GIM) has been generated by weighting RT-GIMs from ionosphere centers including ...

This paper investigates the local and global ionospheric responses to 2022 Tonga volcano eruption, using ground-based Global Navigation Satellite System (GNSS) total electron content (TEC), Swarm in-situ plasma density measurements, Ionospheric Connection Explorer (ICON) Ion Velocity Meter (IVM) data, ionosonde measurements. The main results are as follows: (1) A significant hole of more than 1...

This paper presents a new cycle slip detection and repair method using Total Electron Content Rate (TECR) information derived from individual satellite dual-frequency data of a single Global Positioning System (GPS) receiver while pseudorange measurements are subject to arbitrarily large range errors. Sudden Increase of Pseudorange Error (SIPE), similar to cycle slips in nature, is quite common...

The estimation of Total Electron Content (TEC) in the equatorial ionosphere using GPS presents a number of challenges due to the presence of strong spatio-temporal density gradients and scintillation of the satellite signals caused by F-region irregularities. In this paper we describe a methodology for real-time calibrated TEC estimation in the presence of scintillation and a highly structured ...

This paper develops a new automated cycle slip detection and repair method that is based on only one single dual-frequency GPS receiver. This method jointly uses the ionospheric total electron contents (TEC) rate (TECR) and Melbourne–Wübbena wide lane (MWWL) linear combination to uniquely determine the cycle slip on both L1 and L2 frequencies. The cycle slips are inferred from the information o...

To investigate the temporal-spatial distribution and evolutions of global Total Electron Content (TEC), we estimate the global TEC data from 1999 to 2013 by processing the GPS data collected by the International Global Navigation Satellite System (GNSS) Service (IGS) stations, and robustly constructed the TEC time series at each of the global 5°×2.5° grids. We found that the spatial distributio...

In the present work neural network has been developed for prediction of Vertical Total Electron Content (VTEC) over Bhopal (23.2°N, 77.4°E & MLAT 14.2°N), an equatorial anomaly crest region. The study is based on VTEC data recorded by a multi-frequency multi-constellation GNSS receiver installed at during May 2016 to August 2017. Neural Network (NN) consists artificial neurons that are used lea...