Topside ionosphere and plasmasphere: Use of NeQuick in connection with Gallagher plasmasphere model

Cueto, M.; Coïsson, Pierdavide; Radicella, S. M.; Herráiz, M.; Ciraolo, L.; Brunini, C.

doi:10.1016/j.asr.2007.01.073

Cited by 7 publications

(6 citation statements)

References 6 publications

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“…Thus, special care was taken to address the plasmasphere contribution in the Galileo ionospheric correction model NeQuick (e.g. Cueto et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

A new electron density model of the plasmasphere for operational applications and services

Jakowski

Hoque

2018

J. Space Weather Space Clim.

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The Earth's plasmasphere contributes essentially to total electron content (TEC) measurements from ground or satellite platforms. Furthermore, as an integral part of space weather, associated plasmaspheric phenomena must be addressed in conjunction with ionosphere weather monitoring by operational space weather services. For supporting space weather services and mitigation of propagation errors in Global Navigation Satellite Systems (GNSS) applications we have developed the empirical Neustrelitz plasmasphere model (NPSM). The model consists of an upper L shell dependent part and a lower altitude dependent part, both described by specific exponential decays. Here the McIllwain parameter L defines the geomagnetic field lines in a centered dipole model for the geomagnetic field. The coefficients of the developed approaches are successfully fitted to numerous electron density data derived from dual frequency GPS measurements on-board the CHAMP satellite mission from 2000 to 2005. The data are utilized for fitting up to the L shell L = 3 because a previous validation has shown a good agreement with IMAGE/RPI measurements up to this value. Using the solar radio flux index F10.7 as the only external parameter, the operation of the model is robust, with 40 coefficients fast and sufficiently accurate to be used as a background model for estimating TEC or electron density profiles in near real time GNSS applications and services. In addition to this, the model approach is sensitive to ionospheric coupling resulting in anomalies such as the Nighttime Winter Anomaly and the related Mid-Summer Nighttime Anomaly and even shows a slight plasmasphere compression of the dayside plasmasphere due to solar wind pressure. Modelled electron density and TEC values agree with estimates reported in the literature in similar cases.

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“…Thus, special care was taken to address the plasmasphere contribution in the Galileo ionospheric correction model NeQuick (e.g. Cueto et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

A new electron density model of the plasmasphere for operational applications and services

Jakowski

Hoque

2018

J. Space Weather Space Clim.

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“…The contribution of the plasmaspheric electron density to TEC cannot be neglected (Gulyaeva and Titheridge, 2006;Gulyaeva and Gallagher 2007;Cueto et al, 2007;Reinisch et al, 2007). However, observations of the electron density to construct a reliable model are limited in the topside ionosphere and plasmasphere compared with the bottomside and the F-layer peak (Bilitza and Williamson, 2000).…”

Section: Introductionmentioning

confidence: 99%

Regional reference total electron content model over Japan based on neural network mapping techniques

Maruyama

2007

Ann. Geophys.

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Abstract.A regional reference model of total electron content (TEC) was constructed using data from the GPS Earth Observation Network (GEONET), which consists of more than 1000 Global Positioning System (GPS) satellite receivers distributed over Japan. The data covered almost one solar activity period from April 1997 to June 2007. First, TECs were determined for 32 grid points, expanding from 27 to 45 • N in latitude and from 127 to 145 • E in longitude at 15-min intervals. Secondly, the time-latitude variation averaged over three days was determined by using the surface harmonic functional expansion. The coefficients of the expansion were then modeled by using a neural network technique with input parameters of the season (day of the year) and solar activity (F10.7 index and sunspot number). Thus, two-dimensional TEC maps (time vs. latitude) can be obtained for any given set of solar activity and day of the year.

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“…For GPS-TEC applications the uncertainties or inaccuracies of the pure ionospheric models (e.g., Brown et al, 1991;Cueto et al, 2007) have long been recognized as one of the major causes for inaccuracies in the calculated propagation characteristics. In order to evaluate a measure of the plasmasphere contribution to the transionospherictransplasmaspheric TEC, two plasmaspheric extensions of the International Reference Ionosphere model (IRI) (Bilitza, 2001) have been compared in the present paper with GPS-TEC observations.…”

Section: Introductionmentioning

confidence: 99%

Comparison of two IRI electron-density plasmasphere extensions with GPS-TEC observations

Gulyaeva

Gallagher

2007

Advances in Space Research

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Topside ionosphere and plasmasphere: Use of NeQuick in connection with Gallagher plasmasphere model

Cited by 7 publications

References 6 publications

A new electron density model of the plasmasphere for operational applications and services

A new electron density model of the plasmasphere for operational applications and services

Regional reference total electron content model over Japan based on neural network mapping techniques

Comparison of two IRI electron-density plasmasphere extensions with GPS-TEC observations

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