Results 21 to 30 of about 5,914 (256)

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  

Determination of Ionospheric Total Electron Content (TEC): Phase Measurement Based on Leveling Technique

2009 Third UKSim European Symposium on Computer Modeling and Simulation, 2009
GPS has become a great tool for ionospheric studies and research. The accuracy or quality of coordination data of GPS receiver can be increased by determining the source and factor of the disturbances that produce at ionosphere layer. Basically, dual frequency carrier-phase and code-delay Global Positioning System (GPS) observations are combined to ...
Mohamad Huzaimy Bin Jusoh, Noor Hafizah Abdul Aziz, Muhammad Adib Haron, Mohd Amirshaifulrazain Abu Zaini, Ahmad Asari Sulaiman   +4 more
openaire   +2 more sources

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

Isolated ionospheric disturbances as deduced from global GPS network [PDF]

Annales Geophysicae, 2004
We investigate an unusual class of medium-scale traveling ionospheric disturbances of the nonwave type, isolated ionospheric disturbances (IIDs) that manifest themselves in total electron content (TEC) variations in the form of single aperiodic ...
E. L. Afraimovich, E. I. Astafieva, S. V. Voyeikov   +2 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

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

All‐Solution‐Processed HgTe Quantum Dot Photodetectors for Extended Short‐Wavelength Infrared Range Enhanced by Plasmonic ITO Nanocrystals

Advanced Functional Materials, EarlyView.
All‐solution‐processed, low‐cost extended short‐wavelength infrared photodetectors are realized by coupling colloidal HgTe quantum dots to plasmonic In2O3:Sn,F nanocrystals. Localized surface plasmon resonances boost and spectrally tailor light absorption between 1500 and 3000 nm, enabling responsivities above 40 A W−1.
Kseniia A. Sergeeva, Anastasiia V. Sokolova, Chenxi Guo, Yuanfei Huo, Yulia V. Kuznetsova, Ran An, Aleksandr A. Sergeev, Kam Sing Wong, Tianshuo Zhao, Andrey L. Rogach   +9 more
wiley   +1 more source

Stepwise On‐Surface Synthesis and Transformations of Two‐Dimensional Covalent Organic Frameworks by Controlled Thermal Stimuli

Advanced Materials, EarlyView.
The seminal transformation of a 2D‐COF (SURFCOF‐IMDEA1) into a 2D porous COF (SURFCOF‐IMDEA2) on Au(111) by a sequential C‐C coupling and ladderization triggered by thermal annealing steps at increasing temperatures is reported. Abstract The development of covalent organic frameworks (COFs) is currently a primary objective in materials science, taking ...
Ana Barragán, Elena Pérez‐Elvira, Diego J. Vicent, Marco Lozano, Diego Soler‐Polo, Koen Lauwaet, José M. Gallego, Rodolfo Miranda, José I. Urgel, Pavel Jelínek, Nazario Martín, David Écija   +11 more
wiley   +1 more source

Model evaluation of accuracy of obtaining total electron content by the method of spaced reception of low Earth orbit satellite signals

Vestnik MGTU, 2022
A model-based technique to estimate the accuracy of the ionospheric total electron content (TEC) based on the data from spaced receivers of low Earth orbit satellite signals has been suggested. That allows us to estimate the total electron content errors
Cherniakov S. M.
doaj   +1 more source