Total electron content - A key parameterin propagation: measurement and usein ionospheric imaging

Kersley, L.; Malan, D.; Pryse, S. E.; Cander, Ljiljana R.; Bamford, R.; Belehaki, A.; Leitinger, R.; Radicella, S. M.; Mitchell, Cathryn N.; Spencer, P.S.

doi:10.4401/ag-3286

Cited by 24 publications

(11 citation statements)

References 25 publications

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“…The importance of accurate spatial and temporal vTEC specification [11] in the context of a wide spectrum of spacebased telecommunication, radar and navigation systems was a decisive factor encouraging a number of studies with various modeling approaches and prediction techniques [12]. These techniques have ranged from statistical time-series analysis [13] and harmonic analysis [14], [15] to AI techniques.…”

Section: Background and Related Workmentioning

confidence: 99%

A GP-MOEA/D Approach for Modelling Total Electron Content over Cyprus

Konstantinidis¹,

Haralambous²,

Agapitos³

et al. 2011

Preprint

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Vertical Total Electron Content (vTEC) is an ionospheric characteristic used to derive the signal delay imposed by the ionosphere on near-vertical trans-ionospheric links. The major aim of this paper is to design a prediction model based on the main factors that influence the variability of this parameter on a diurnal, seasonal and long-term time-scale. The model should be accurate and general (comprehensive) enough for efficiently approximating the high variations of vTEC. However, good approximation and generalization are conflicting objectives. For this reason a Genetic Programming (GP) with Multi-objective Evolutionary Algorithm based on Decomposition characteristics (GP-MOEA/D) is designed and proposed for modeling vTEC over Cyprus. Experimental results show that the Multi-Objective GPmodel, considering real vTEC measurements obtained over a period of 11 years, has produced a good approximation of the modeled parameter and can be implemented as a local model to account for the ionospheric imposed error in positioning. Particulary, the GP-MOEA/D approach performs better than a Single Objective Optimization GP, a GP with Non-dominated Sorting Genetic Algorithm-II (NSGA-II) characteristics and the previously proposed Neural Network-based approach in most cases.

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Section: Background and Related Workmentioning

confidence: 99%

A GP-MOEA/D Approach for Modelling Total Electron Content over Cyprus

Konstantinidis¹,

Haralambous²,

Agapitos³

et al. 2011

Preprint

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show abstract

“…The effects of the ionosphere on the GPS signal can be measured using Total Electron Content (TEC), where TEC is the number of electrons in a column along a satellite signal path to a receiver with a cross sectional area of one square meter [5]. TEC is measured in electrons per square meter where 1 TECU = 10 ^ 16 electrons / m².…”

Section: Introductionmentioning

confidence: 99%

Preliminary study of topside ionospheric variations using SWARM satellites over the Malaysia Region

Bahari

Husin

Abdullah

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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The European Space Agency (ESA) launched a satellite constellation mission called Swarm in 2013. The Swarm satellites named A, B and C are equipped with Global Positioning System (GPS) receivers which can be used to study the topside of the ionosphere. In Malaysia, the use of ionospheric data from the Swarm satellites is still new as most researchers previously used GPS receivers on the Earth. This paper presents the preliminary result of topside-ionosphere parameter, Total Electron Content (TEC) over Malaysia using the Swarm satellite data. TEC from the Swarm data were analyzed during quiet and disturbed geomagnetic days. The results showed that the Swarm satellites passed through Malaysia twice in 24 hours and the variations of TEC over Malaysia ranged from 2 to 20 TECU. Analysis of the topside ionosphere during a geomagnetic storm showed a sudden decreased of TEC compared to the quiet days. The findings indicate that the variations of topside TEC using Swarm are in agreement with those found in previous studies.

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“…In this regard, the TEC is a referential measure of the ionosphere plasma density as a function of free electrons. This parameter can be obtained from the analysis of Global Navigation Satellite System (GNSS) signals and is thoroughly defined as the number of free electrons in the ionized plasma contained along an imaginary tube with a cross section of 1 m 2 , whose ends are delimited by satellite in orbit and ground receiver (Kersley et al, 2004). Therefore, since the TEC is a good measure of the ionospheric plasma density, many efforts have been made to develop ionospheric indices for quantifying the TEC variations associated with the space weather phenomena (Gulyaeva and Stanislawska, 2008;Sanz et al, 2014;Wilken et al, 2018;Jakowski and Hoque, 2019;Denardini et al, 2020a).…”

Section: Introductionmentioning

confidence: 99%

Study of the equatorial and low-latitude total electron content response to plasma bubbles during solar cycle 24–25 over the Brazilian region using a Disturbance Ionosphere indeX

et al. 2022

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Abstract. This work uses the Disturbance Ionosphere indeX (DIX) to evaluate the ionospheric responses to equatorial plasma bubble (EPB) events from 2013 to 2020 over the Brazilian equatorial and low latitudes. We have compared the DIX variations during EPBs to ionosonde and All-Sky Imager data, aiming to evaluate the physical characteristics of these events. Our results show that the DIX was able to detect EPB-related TEC disturbances in terms of their intensity and occurrence times. Thus, the EPB-related DIX responses agreed with the ionosphere behavior before, during, and after the studied cases. Finally, we found that the magnitude of those disturbances followed most of the trends of solar activity, meaning that the EPB-related total electron content variations tend to be higher (lower) in high (low) solar activity.

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Total electron content - A key parameterin propagation: measurement and usein ionospheric imaging

Cited by 24 publications

References 25 publications

A GP-MOEA/D Approach for Modelling Total Electron Content over Cyprus

A GP-MOEA/D Approach for Modelling Total Electron Content over Cyprus

Preliminary study of topside ionospheric variations using SWARM satellites over the Malaysia Region

Study of the equatorial and low-latitude total electron content response to plasma bubbles during solar cycle 24–25 over the Brazilian region using a Disturbance Ionosphere indeX

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