Results 31 to 40 of about 36,192 (283)

Calibration errors on experimental slant total electron content (TEC) determined with GPS

Journal of Geodesy, 2006
The Global Positioning System (GPS) has become a powerful tool for ionospheric studies. In addition, ionospheric corrections are necessary for the augmentation systems required for Global Navigation Satellite Systems (GNSS) use. Dual-frequency carrier-phase and code-delay GPS observations are combined to obtain ionospheric observables related to the ...
Ciraolo, L., Azpilicueta, Francisco Javier, Brunini, Claudio Antonio, Meza, Amalia Margarita, Radicella, Sandro M.   +4 more
openaire   +3 more sources

Harmonic Analysis of Ionospheric Total Electron Content (TEC) Using Kalman Filter

Journal of Physics: Conference Series, 2019
Abstract The ionospheric diurnal variation from TEC Global Ionospheric Maps (GIM) data at the epicenter coordinates of the Lombok earthquake on July 29 2018 (-8.4°, 116.5°) has been analyzed using harmonic function which is the sum of the sine and cosine functions with estimated harmonic coefficients obtained using Kalman Filter (KF ...
Buldan Muslim, K Charisma Juni, null Erlansyah   +2 more
openaire   +1 more source

GPS Total Electron Content measurements at low latitudes in Brazil for low solar activity [PDF]

Geofísica Internacional, 2004
Variations of ionospheric Total Electron Content (TEC) have been calculated using GPS data at station Presidente Prudente, Brazil (22.1° S; 51.4° W) in 1997, a period of low solar activity. Two hourly TEC averages are presented for the period.
Edvaldo S. da Fonseca Junior, J. Williams Vilas Boas, Aracy Mendes da Costa   +2 more
doaj  

Reliability Assessment of Multi-Source TEC Maps over Brazil Using Ground Truth Validation

Atmosphere
Total Electron Content (TEC) maps allow the evaluation of the state of the ionosphere. There are many providers/sources of worldwide or regional TEC maps for the continuous monitoring of the ionosphere, which employ different GNSS monitoring networks for
Marco A. de U. Cintra, Stephan Stephany, Lamartine N. F. Guimarães, Eurico R. de Paula, André R. F. Martinon, Patrícia M. de S. Negreti, Alison de O. Moraes, Jonas R. de Souza   +7 more
doaj   +1 more source

Galileo E5 AltBOC Signals: Application for Single-Frequency Total Electron Content Estimations

Remote Sensing, 2021
Global navigation satellite system signals are known to be an efficient tool to monitor the Earth ionosphere. We suggest Galileo E5 AltBOC phase and pseudorange observables—a single-frequency combination—to estimate the ionospheric total electron content
Artem M. Padokhin, Anna A. Mylnikova, Yury V. Yasyukevich, Yury V. Morozov, Gregory A. Kurbatov, Artem M. Vesnin   +5 more
doaj   +1 more source

Neural network based tomographic approach to detect earthquake-related ionospheric anomalies [PDF]

, 2011
A tomographic approach is used to investigate the fine structure of electron density in the ionosphere. In the present paper, the Residual Minimization Training Neural Network (RMTNN) method is selected as the ionospheric tomography with which to ...
K. Hattori, M. Nishihashi, S. Hirooka, T. Takeda   +3 more
core   +1 more source

High‐resolution station‐based diurnal ionospheric total electron content (TEC) from dual‐frequency GPS observations [PDF]

Space Weather, 2013
AbstractTotal electron content (TEC) estimates derived from Global Navigation Satellite System (GNSS) signal delays provide a rich source of information about the Earth's ionosphere. Networks of Global Positioning System (GPS) receivers data can be used to represent the ionosphere by a Global Ionospheric Map (GIM). Data input for GIMs is dual‐frequency
Cepni, Murat S., Potts, Laramie V., Miima, John B.   +2 more
openaire   +3 more sources

Ionospheric response to the 2009 sudden stratospheric warming over the equatorial, low, and middle latitudes in the South American sector [PDF]

, 2015
The present study investigates the ionospheric total electron content (TEC) and F-layer response in the Southern Hemisphere equatorial, low, and middle latitudes due to major sudden stratospheric warming (SSW) event, which took place during January ...
Coster, A. J., De Abreu, A. J., De Jesus, R., Fagundes, P. R., Gende, Mauricio Alfredo, Goncharenko, L. P., Pezzopane, M., Pillat, V. G., Venkatesh, K.   +8 more
core   +2 more sources

A model assisted ionospheric electron density reconstruction method based on vertical TEC data ingestion

Annals of Geophysics, 2005
A technique to reconstruct the electron density of the ionosphere starting from total electron content values has been developed using the NeQuick ionospheric electron density model driven by its effective ionization parameter Az. The technique
S. M. Radicella, F. Azpilicueta, G. Miró Amarante, P. Coïsson, B. Nava   +4 more
doaj   +1 more source

The Effect of Sunspots Number on the Total Electron Content (TEC) of the Ionospheric Layer E Over Kirkuk Station for Solar Cycle 24 [PDF]

Kirkuk Journal of Science, 2020
In this work, the effect of sunspots number (Ri) on the Total electronic content (TEC) were studied for the years (2008, 2014, 2018) which represents the rising phase, the peak and the down phase of the solar cycle 24 over Kirkuk station in Iraq at ...
Wafaa Zaki, Rwziah Mahmood Mohammed, Jawdet Hidayat   +2 more
doaj   +1 more source