Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 24 for “"Total electron content (TEC)"”.
-
Ionospheric imaging using computerized tomography
Computerized tomography (CT) techniques can be used to produce a two-dimensional image of the electron density in the ionosphere. The necessary data are transionospheric satellite beacon total electron content (TEC) data recorded simultaneously at multiple ground stations.
-
An Investigation of magnetic storm effects on total electron content over South Africa for selected periods in solar cycles 23 and 24
The development of regional ionospheric Total Electron Content (TEC) models has contributed to understanding the behavior of ionospheric parameters and the coupling of the ionosphere to space weather activities on both local and global scales. In the past several decades, the International Global …
-
Analysis of Ionospheric Data Sets to Identify Periodic Signatures Matching Atmospheric Planetary Waves
… lower thermosphere. The ionospheric data-set is Total Electron Content (TEC), which is used to identify periods during which the ionosphere appears to respond to the planetary waves. Data from KP and F10.7 indices are used to determine events that may be of external origin. A 17-year time-span …
-
Quantification of Effect of Solar Storms on TEC over U.S. sector Using Machine Learning
… 24 is presented to quantify their effects on the total electron content (TEC) in the ionosphere. We study the dependence of TEC over the contiguous US on various storm parameters, including the onset time of the storm, the duration of the storm, its intensity, and the rate of change of the ring …
-
Development and applications of ionospheric tomography
Recently, several tomographic techniques for ionospheric electron density imaging have been proposed. These techniques reconstruct a vertical slice image of electron density using total electron content data. The data are measured between a low orbit beacon satellite and fixed receivers located …
-
Dynamics of the geomagnetically disturbed ionosphere as measured by GPS receivers and SuperDARN HF radars
Total electron content (TEC) data measured from ground-based GPS receivers is compared to HF backscatter from ionospheric irregularities obtained by Super Dual Auroral Radar Network (SuperDARN) radars. We present the first observations of a recurrent region of anomalous enhanced TEC at …
-
Medium Scale Travelling Ionospheric Disturbances sensed with GNSS TEC and SuperDARN
… Global Navigational Satellite Service (GNSS) Total Electron Content (TEC) techniques and coherent scatter radars such as the Super Dual Auroral Radar Network (SuperDARN). MSTIDs, especially those observed during quiet times and on the night side, have been known to be driven by electrodynamic …
-
GNSS-based Spacecraft Formation Flying Simulation and Ionospheric Remote Sensing Applications
… flying. Ionospheric remote sensing, such as Total Electron Content (TEC) measurements or ionospheric irregularity studies are important potential Low Earth Orbit (LEO) applications. A GNSS-based Hardware-in-the-loop (HIL) simulation testbed for LEO spacecraft formation flying has been …
-
Variations Of E-Region Total Electron Content And Electron Density Profiles Over High Latitudes During Winter Solstice 2007 Using Radio Occultation Measurements
… on the various layers of the Earth's atmosphere Technological advancements have created a situation in which human civilization is not only dependent on resources from deep inside the Earth, but also on the upper atmosphere and outer space region. Therefore, it is essential to improve the …
-
2-D radio imaging of equatorial ionospheric plasma depletions with the C/NOFS satellite: algorithms and results
Local depletions in the equatorial ionospheric electron density, known as spread-F events, have been an active area of scientific research in the last decades. These are of special interest to the research community because of their potentially deleterious impact on trans-ionospheric communication …
-
Influence of lightning on electron density variation in the ionosphere using WWLLN lightning data and GPS data
… over South Africa. Lightning induced changes in total electron content (TEC) are strongest between September and March, with the more-pronounced effects occurring 12:00 - 22:00 UT, but from April through August there is a low probability of having significant lightning-induced TID occurrence. The …
-
Nonlinear State Estimation of the Ionosphere as Perturbed by the 2017 Great American Eclipse
… the amount of solar radiation it receives and a total solar eclipse produces a short perturbation to the incoming solar radiation. Analyzing how the ionosphere reacts to this type perturbation could lead to new levels of understanding of it. This study develops a nonlinear filter that estimates …
-
Calibration of a SuperDARN Radar Antenna by means of a Satellite Beacon
… on the satellite is to measure the ionospheric total electron content (TEC) by using either measurements of the carrier phase delays or of the Faraday rotation of the signal. An orbit analysis was done for the CubeSat using parameters for an orbit at an altitude of 600 km and inclination angles …
-
Generation of acoustic-gravity waves in ionospheric HF heating experiments : simulating large-scale natural heat sources
… heat wave event. Our examination of GPS-derived total electron content (TEC) data over the North American sector reveals a quite noticeable increase in the level of daily plasma density fluctuations during the summer 2006 heat wave period. Comparison with the summer 2005 and summer 2007 data …
-
Contemporary Ionospheric Scintillation Studies: Statistics, 2D Analytical and 3D Numerical Inversion
… support the development of impact mitigation techniques, and deepen our understanding of the underlying physics. The work in this dissertation focused on the statistical analysis of Global Positioning System (GPS) scintillation data, data inversion, two-dimensional (2D) and three-dimensional …
-
Peramalan jumlah kandungan elektron menggunakan kaedah suapan ke hadapan rangkaian neural di Semenanjung Malaysia
Total Electron Content (TEC) is one of the physical quantities that can be derived from global positioning system (GPS) data and provides an indication of ionospheric variability. TEC variations have significant effects on radio communications, applications involving navigational systems, GPS …
-
The Co-Volcanic Ionospheric Disturbances at Mt.Etna, Italy
… affects the GNSS signals as a function of its electron density. By this condition the total electron content (TEC) of the ionosphere can be estimated from GNSS data. TEC fluctuations can be related, from above, to space weather dynamics or, from below, to geodynamic events and then GNSS-TEC …
-
Total Electron Content reconstruction using triple frequency GNSS signals
… frequency, and directly proportional to the Total Electron Content (TEC) of the ionosphere. In the last 20 years, several techniques using dual frequency GNSS measurements have been developed to estimate the TEC. With these techniques, systematic errors are confined to at least - 2.5 and 2.5 …
-
Atmospheric and Ionospheric Responses to Acoustic and Gravity Waves Driven by Earthquakes and Tsunamis
… Navigation Satellite System signals’ derived total electron content (TEC) observations may supplement seismological studies through the investigation of finite-fault models and their ability to reproduce detected ionospheric perturbations. In this case, numerical simulations are the most …
Page 1 of 2