Browsing by Keywords "Ionosphere"
Now showing items 1-20 of 44
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3D electron density estimation in the ionosphere
(IEEE, 2014)Ionosphere has ion distribution which is variable in space and time. There have been physical and empirical studies for modeling the ionosphere. International Reference Ionosphere extended to Plasmasphere (IRI-Plas) is the ... -
Algorithms and basis functions in tomographic reconstruction of ionospheric electron density
(IEEE, 2005)Computerized ionospheric tomography (CIT) is a method to investigate ionosphere electron density in two or three dimensions. This method provides a flexible tool for studying ionosphere. Earth based receivers record signals ... -
Anomaly detection in diverse sensor networks using machine learning
(Bilkent University, 2022-01)Earthquake precursor detection is one of the oldest research areas that has the potential of saving human lives. Recent studies have enlightened the fact that strong seismic activities and earthquakes affect the electron ... -
Association of ionospheric storms and substorms of global electron content with proxy AE index
(Pergamon Press, 2015)Storm time modeling of Global Electron Content (GEC) calculated from GIM-TEC for 1999-2013 is associated with new proxy of Auroral Electrojet variability expressed as a smoothed and normalized Auroral Electrojet index ... -
Classification of regional ionospheric disturbance based on machine learning techniques
(European Space Agency, 2016)In this study, Total Electron Content (TEC) estimated from GPS receivers is used to model the regional and local variability that differs from global activity along with solar and geomagnetic indices. For the automated ... -
Computerized ionospheric tomography with the IRI model
(Elsevier BV, 2007)Computerized ionospheric tomography (CIT) is a method to estimate ionospheric electron density distribution by using the global positioning system (GPS) signals recorded by the GPS receivers. Ionospheric electron density ... -
Determining F2 layer parameters via optimization using IRI model and IONOLAB TEC estimations
(IEEE, 2011)We know that F2 layer of the ionosphere is most important layer in the progaration of high frequency (HF) waves. In this study, The relation of the height (HmF2) and the critical frequency (FoF2) of F2 layer-among the ... -
Dynamo equation solution using Finite Volume Method for midlatitude ionosphere
(KeAi Communications Co., 2018)Ionosphere is the layer of atmosphere which plays an important role both in space based navigation, positioning and communication systems and HF signals. The structure of the electron density is a function of spatio-temporal ... -
Estimation of 3D electron density in the Ionosphere by using fusion of GPS satellite-receiver network measurements and IRI-Plas model
(IEEE, 2013)GPS systems can give a good approximation of the Slant Total Electron Content in a cylindrical path between the GPS satellite and the receiver. International Reference Ionosphere extended to Plasmasphere (IRI-Plas) model ... -
A hybrid reconstruction algorithm for computerized ionospheric tomography
(IEEE, 2005)Computerized Ionospheric Tomography (CIT) is a method to reconstruct ionospheric electron density images by using the Global Positioning System data collected by the earth based receivers. In this study, Total Electron ... -
Interpolation of ionospheric modalities using kriging, co-kriging and spatio-temporal kriging
(Bilkent University, 2018-06)Long distance communication and navigation systems operating in the HF band use interacting signals as they travel through the ionosphere. It is important to accurately model ionospheric behavior to increase the performance ... -
Investigation of hourly and daily patterns for lithosphere-ionosphere coupling before strong earthquakes
(IEEE, 2009-06)The ionosphere can be characterized with its electron density distribution which is a complex function of spatial and temporal variations, geomagnetic, solar and seismic activity. An important measurable quantity about the ... -
Investigation of ionospheric trend over Turkey using sliding window statistical analysis method
(IEEE, 2013)In this paper, variability of trend over Turkey is investigated statistically by Sliding Window Statistical Analysis (SWSA) method. First and second moment of the variability of ionospheric trend is calculated by SWSA ... -
Investigation of litosphere-ionosphere coupling using total electron content
(IEEE, 2009)In this study, the relation between Total Electron Content (TEC) estimates obtained from GPS and the earthquakes is examined. Five earthquakes between 2003-2008 occured in Japan with different properties and China earthquake ... -
Investigation of short-period ionospheric variation over Turkey
(IEEE, 2014)In this paper, characteristic of short-period ionospheric variability over Turkey is determined statistically by a novel metric. First and second moment of the variability of ionospheric variations is calculated by Sliding ... -
Investigation of total electron content variability due to seismic and geomagnetic disturbances in the ionosphere
(Wiley-Blackwell Publishing, 2010-10-20)Variations in solar, geomagnetic, and seismic activity can cause deviations in the ionospheric plasma that can be detected as disturbances in both natural and man-made signals. Total electron content (TEC) is an efficient ... -
Ionolab grubunun iyonküre uzaktan algılama ve 2-b görüntüleme çalışmaları
(IEEE, 2014-04)Bu çalışmada, IONOLAB grubunun son 10 yıldır iyonküre uzaktan algılaması ve 2-B görüntüleme çalışmaları özetlenecektir. TÜBİTAK EEEAG 105E171 ve 109E055 projelerinde, çift frekanslı Yerküresel Konumlama Sistemi (YKS) ... -
İyonküre elektron içeriği kullanılarak deprem öncül tespit sinyali oluşturulması
(IEEE, 2014-04)Sismik olayların iyonküredeki elektron dağılımını etkilediği ve bu etkinin bir kaynağının sismik hareketlilik öncesi kayaçların sıkışması sonucu kayaç yüzeylerinde oluşan elektrik alanın yol açtığı iyonlaşma olduğu yakın ... -
İyonosfer TEİ verilerinin uzay-zamansal aradeğerlemesi
(IEEE, 2011-04)GPS sinyalleri iyonosferdeki elektron yoğunluğunun kestirilmesi için önemli bir bilgi kaynağıdır. Ancak, GPS alıcılarında sinyallerin kaydedilemediği durumlar olmaktadır. Bu kesinti sırasında iyonosfer elektron içeriğinin ... -
KD haberleşme için iyonkürenin plazma frekansı -yükseklik profilinin matematiksel modellenmesi
(IEEE, 2014-04)İyonkürenin plazma frekansı - yükseklik profili özellikle gökdalgası ile yapılan KD haberleşmesini önemli derecede etkilemektedir. Bu çalışmada, belirli bir coğrafik bölge üzerinden bulunan bu profilin, en küçük kareler ...
