An evaluation of the IRI-2007 storm time model at low latitude stations

Oyeyemi, E. O.; Adewale, A.O.; Adeloye, A. B.; Olugbon, B.

doi:10.1016/j.asr.2013.04.027

Cited by 11 publications

(6 citation statements)

References 33 publications

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“…Since IRI is a climatological model, it cannot provide TEC values with the high accuracy as GPS-TEC values. Many authors have reported evaluations of the IRI model over different areas of the world during periods of quiet or active space weather2425262728293031323334353637. The capabilities of and improvements to the IRI model have been shown, but there is not very good agreement between the IRI model predictions and the observed values, especially during periods of active space weather.…”

Section: Basic Methodology Of Global Vtec Modelingmentioning

confidence: 99%

Project Loon based augmentation for global ionospheric modeling over Southern Hemisphere

Wang¹,

Shi

Zhang

2017

Sci Rep

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Global ionospheric products of vertical total electron content (VTEC) derived from GNSS measurements may have low accuracy over oceans and southern latitudes where there are not rich observations. Project Loon provides a great opportunity to enhance the measurements over those areas. In this contribution, a simulation of Project Loon based augmentation for global ionospheric modeling is performed by using the international reference ionosphere (IRI) which could simulate VTEC measurements for the balloons. The performance of the enhanced method based on simulation of Project Loon is investigated by comparing with VTEC maps from Ionosphere Associate Analysis Centers (IAACs) as well as IGS final GIMs. The comparison indicates that there is a better consistency between the VTEC maps by the enhanced method and IGS final GIMs. Also, obvious improvements of RMS maps in GIMs for the middle latitudes and southern latitudes are enabled by the augmentation of Project Loon. Additionally, JASON data are used to validate the specific improvement of the VTEC maps. The results show that the performance of VTEC maps is improved slightly, especially in southern latitudes. It is possible that the VTEC maps could be improved significantly by using real GPS measurements from balloons of Project Loon in the near future.

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Section: Basic Methodology Of Global Vtec Modelingmentioning

confidence: 99%

Project Loon based augmentation for global ionospheric modeling over Southern Hemisphere

Wang¹,

Shi

Zhang

2017

Sci Rep

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“…To quantitatively evaluate the degree of agreement between the observed values and the IRI predicted values, we use several criteria including mean difference (hereafter referred to as MD), root mean square error (RMSE) (Ikubanni et al 2014), and relative deviation module mean (RDMM) (Bertoni et al 2006;Oyeyemi et al 2013). They are calculated according to the following expressions:…”

Section: Methodsmentioning

confidence: 99%

“…The major update is that new neural network-based global models for the F2 peak parameters are developed and evaluated (Bilitza et al 2011). Many authors have reported evaluations of the IRI model using some ionospheric characteristic parameters over many areas of the world during quiet or active space weather, such as IRI predicted NmF2 and hmF2 values (Adeniyi et al 2003;Araujo-Pradere et al 2003;Bilitza et al 2004;Lee and Reinisch 2006;Oyeyemi et al 2013;Wichaipanich et al 2013;Ikubanni et al 2014), and IRI predicted TEC (Bhuyan and Borah 2007;Adewale et al 2011;Kenpankho et al 2013;Okoh et al 2013;Olwendo et al 2013). They have shown the abilities and improvements of the IRI model to predict ionospheric parameters in recent years.…”

Section: Introductionmentioning

confidence: 99%

Comparison of ionospheric characteristic parameters obtained by GPS and ionosonde with IRI model over China

Wang

2016

J Earth Syst Sci

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This paper presents a comparison of ionospheric characteristic parameters obtained by a GPS network and three ionosondes at Mohe (122.4 • E, 53.5 • N, dip angle 70.983 • N), Zuolingzhen (114.6 • E, 30.5 • N, dip angle 46.350 • N), and Fuke (109.1 • E, 19.5 • N, dip angle 27.083 • N) located in China with an IRI model in the year 2011. Observed NmF2 and hmF2 values at the three stations are compared with IRI2007 and IRI2012 predictions, respectively. The results show that there are clear linear correlations between the observed values and the IRI model predicted values. The IRI model gives overestimations at the three stations mostly in 2011. For the NmF2 and hmF2 values, most of the results show that the IRI2012 predicted values are closer to the observed values compared with those of IRI2007. Additionally, the GPS TEC values derived from the Crustal Movement Observation Network of China (CMONOC) are compared with the IRI2012 predictions. From the results, it is evident that the IRI2012 model predictions follow the normal trend of diurnal variation of GPS measured TEC monthly means but do not reproduce the measured data well. The IRI2012 model overestimates electron density in the latter part of spring as well as the first half of autumn and winter and underestimates electron density in early spring and the latter part of autumn. Referring to GPS TEC, the precision of the IRI2012 model predicted TEC values is ∼5 TECU over China. It may also be noted that there are two discontinuities of IRI-TEC monthly means appearing in November and December of the year 2011. This brings a bias of ∼3 TECU of TEC values between two adjacent months.

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“…The storm option (Equation ) gives reliable results at mid latitudes during summer and equinox, but during winter and at low latitudes it does not improve significantly the quiet fo F2 representation made by IRI (Araujo‐Pradere & Fuller‐Rowell, 2001, 2002; Araujo‐Pradere et al., 2003, 2004; Oyeyemi et al., 2013).…”

Section: Electron Density and Vertical Total Electron Contentmentioning

confidence: 99%

The International Reference Ionosphere Model: A Review and Description of an Ionospheric Benchmark

Bilitza

Pezzopane

Truhlík

et al. 2022

Reviews of Geophysics

127

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The terrestrial ionosphere is a plasma, that is, an ionized gas consisting of free electrons and ions. It is part of the Earth's atmosphere and is produced by solar radiation ionizing the neutral gas constituents. Only a small fraction of the neutral atmosphere is ionized. Typical ratios of electron to neutral gas density are 10 −2 at the top of the ionosphere (at a height of about 1,000 km), 10 −3 at the height of the ionospheric absolute electron density maximum (located roughly between 200 and 450 km of height), and 10 −8 at the bottom of the ionosphere (at a height of about 100 km). These limits mark the altitude boundaries of the ionosphere but they must not be considered fixed. They are highly variable in both space and time, in particular this is the case for the upper limit which marks the separation between the ionosphere below it and the plasmasphere above it (

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An evaluation of the IRI-2007 storm time model at low latitude stations

Cited by 11 publications

References 33 publications

Project Loon based augmentation for global ionospheric modeling over Southern Hemisphere

Project Loon based augmentation for global ionospheric modeling over Southern Hemisphere

Comparison of ionospheric characteristic parameters obtained by GPS and ionosonde with IRI model over China

The International Reference Ionosphere Model: A Review and Description of an Ionospheric Benchmark

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