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Evaluation of ionospheric models for Central and South Americas

dos Santos, Telmo Klipp and Petry, Adriano and de Souzaa, Jonas Rodrigues and SandimFalcãoa, Gabriel and Fragade Campos Velho, Haroldo and de Paulaa, Eurico Rodrigues and Antreich, Felix and Hoque, Mohammed Mainul and Kriegel, Martin and Berdermann, Jens and Jakowski, Norbert and Fernandez Gomez, Isabel and Borries, Claudia and Sato, Hiroatsu and Wilken, Volker (2019) Evaluation of ionospheric models for Central and South Americas. Advances in Space Research. Elsevier. DOI: 10.1016/j.asr.2019.09.005 ISSN 0273-1177

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Official URL: https://www.sciencedirect.com/science/article/pii/S0273117719306532

Abstract

This work shows a 20-month statistical evaluation of different Total Electron Content (TEC) estimators for the Central and South America regions. The TEC provided by the International GNSS Service (IGS) in the area covered around the monitoring GNSS stations are used as reference values, and they are compared to TEC estimates from the physics-based (Sheffield University Plasmasphere Ionosphere Model—PIM) and the empirical (Neustrelitz TEC Model-Global—NTCM-GL) models. The mean TEC values show strong dependence on both solar activity and seasonal variation. A clear response was noticed for a period close to 27 days due to the mean solar rotation, as seen in the solar flux measurements. Consistently, the mean TEC values present an annual variation with maxima during December solstices for southern stations with geographic latitudes greater than 25 S. Semi-annual dependence has been observed in TEC for the sector between 25 of geographical latitude but with modulations caused by fluctuation in the solar radiation. We observed a high correlation between solar radio flux F10.7 and NTCM-GL outputs. The fast increases in F10.7 index have caused significant differences between IGS data and NTCM-GL results mainly for equatorial and low latitudes. For the initial months of the evaluated period (January–April, 2016), the errors of the physics-based model were considerably larger, mainly near the equatorial ionization anomaly. The discrepancies observed in SUPIM results are mainly due to inputs of solar EUV flux. The EUVAC model has underestimated EUV flux between January and April, 2016, when the solar activity was moderated and Solar2000 model has overestimated such flux during low solar cycle period between May and August, 2017. In relation to IGS data, the two assessed models presented smaller differences during the June solstice season of 2016.

Item URL in elib:https://elib.dlr.de/132090/
Document Type:Article
Title:Evaluation of ionospheric models for Central and South Americas
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
dos Santos, Telmo KlippINPEUNSPECIFIED
Petry, AdrianoINPEUNSPECIFIED
de Souzaa, Jonas RodriguesINPEUNSPECIFIED
SandimFalcãoa, GabrielINPEUNSPECIFIED
Fragade Campos Velho, HaroldoINPEUNSPECIFIED
de Paulaa, Eurico RodriguesINPEUNSPECIFIED
Antreich, FelixFelix.Antreich (at) dlr.deUNSPECIFIED
Hoque, Mohammed MainulMainul.Hoque (at) dlr.deUNSPECIFIED
Kriegel, MartinMartin.Kriegel (at) dlr.deUNSPECIFIED
Berdermann, JensJens.Berdermann (at) dlr.dehttps://orcid.org/0000-0002-3308-4584
Jakowski, NorbertNorbert.Jakowski (at) dlr.dehttps://orcid.org/0000-0003-3174-2624
Fernandez Gomez, IsabelIsabel.FernandezGomez (at) dlr.deUNSPECIFIED
Borries, Claudiaclaudia.borries (at) dlr.dehttps://orcid.org/0000-0001-9948-3353
Sato, HiroatsuHiroatsu.Sato (at) dlr.dehttps://orcid.org/0000-0002-5886-2768
Wilken, VolkerVolker.Wilken (at) dlr.deUNSPECIFIED
Date:2019
Journal or Publication Title:Advances in Space Research
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.asr.2019.09.005
Publisher:Elsevier
ISSN:0273-1177
Status:Published
Keywords:TEC, GNSS
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Communication and Navigation
DLR - Research area:Raumfahrt
DLR - Program:R KN - Kommunikation und Navigation
DLR - Research theme (Project):R - Vorhaben Ionosphäre
Location: Neustrelitz
Institutes and Institutions:Institute for Solar-Terrestrial Physics
Institute of Communication and Navigation
Deposited By: Sato, Hiroatsu
Deposited On:04 Dec 2019 13:30
Last Modified:04 Dec 2019 13:30

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