Staff View: Assessment of ionosphere models at Banting: Performance of IRI-2007, IRI-2012 and NeQuick 2 models during the ascending phase of Solar Cycle 24

Assessment of ionosphere models at Banting: Performance of IRI-2007, IRI-2012 and NeQuick 2 models during the ascending phase of Solar Cycle 24

The International Reference Ionosphere (IRI) and the NeQuick models have been recognised as the international standard for specifying Earth’s ionospheric parameters. However, the performance of these ionosphere models needs to be validated due to data scarcity from South-East Asian region for model...

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Main Authors:	Leong, S. K., Musa, T. A., Omar, K., Subari, M. D., Pathy, N. B., Asillam, M. F.
Format:	Article
Published:	Elsevier Ltd. 2015
Subjects:	HD Industries. Land use. Labor
Online Access:	http://eprints.utm.my/id/eprint/57911/ http://www.dx.doi.org/10.1016/j.asr.2014.01.026
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spelling	my.utm.579112021-08-30T16:21:50Z http://eprints.utm.my/id/eprint/57911/ Assessment of ionosphere models at Banting: Performance of IRI-2007, IRI-2012 and NeQuick 2 models during the ascending phase of Solar Cycle 24 Leong, S. K. Musa, T. A. Omar, K. Subari, M. D. Pathy, N. B. Asillam, M. F. HD Industries. Land use. Labor The International Reference Ionosphere (IRI) and the NeQuick models have been recognised as the international standard for specifying Earth’s ionospheric parameters. However, the performance of these ionosphere models needs to be validated due to data scarcity from South-East Asian region for model development. This work presents the performance evaluation of IRI-2007, IRI-2012 and NeQuick 2 in estimating ionospheric Total Electron Content (TEC) at Banting (Geographic: 2.78°N, 101.51°E; Geomagnetic: 7.11°S, 173.77°E). For this purpose, TEC values estimated from these models have been compared with TEC values derived from dual-frequency Global Positioning System (GPS) data for the year 2011 (ascending phase of Solar Cycle 24). The results show that equatorial TEC exhibits semi-annual, annual, and seasonal variations with maximum values appearing during equinoctial months and minimum during solstitial months. Generally, ionospheric TEC produced by IRI and NeQuick 2 models are in good agreement with observed TEC. For diurnal variation, the IRI-2007 and NeQuick 2 models show good agreement during post-noon and post-midnight, respectively. Good correlation is observed during noon-time for all models. Disagreements between ionospheric models and observed TEC are found during post-sunset and post-midnight periods, with TEC deviation in the level of 11–14 TECU can be anticipated at 95% probability. On the other hand, TEC calculation from IRI-2012 is better than IRI-2007 and NeQuick 2 for monthly variation. All models score correlation coefficient above 0.9 with the highest correlation noticed during solstitial months. TEC deviation above 10 and up to 15 TECU can be expected in October with 95% probability. Overall, this work reveals that IRI and NeQuick 2 models are capable of predicting TEC with good correlation in most cases. Elsevier Ltd. 2015 Article PeerReviewed Leong, S. K. and Musa, T. A. and Omar, K. and Subari, M. D. and Pathy, N. B. and Asillam, M. F. (2015) Assessment of ionosphere models at Banting: Performance of IRI-2007, IRI-2012 and NeQuick 2 models during the ascending phase of Solar Cycle 24. Advances In Space Research, 55 (8). pp. 1928-1940. ISSN 2728-8421 http://www.dx.doi.org/10.1016/j.asr.2014.01.026 DOI: 10.1016/j.asr.2014.01.026
institution	Universiti Teknologi Malaysia
building	UTM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Malaysia
content_source	UTM Institutional Repository
url_provider	http://eprints.utm.my/
topic	HD Industries. Land use. Labor
spellingShingle	HD Industries. Land use. Labor Leong, S. K. Musa, T. A. Omar, K. Subari, M. D. Pathy, N. B. Asillam, M. F. Assessment of ionosphere models at Banting: Performance of IRI-2007, IRI-2012 and NeQuick 2 models during the ascending phase of Solar Cycle 24
description	The International Reference Ionosphere (IRI) and the NeQuick models have been recognised as the international standard for specifying Earth’s ionospheric parameters. However, the performance of these ionosphere models needs to be validated due to data scarcity from South-East Asian region for model development. This work presents the performance evaluation of IRI-2007, IRI-2012 and NeQuick 2 in estimating ionospheric Total Electron Content (TEC) at Banting (Geographic: 2.78°N, 101.51°E; Geomagnetic: 7.11°S, 173.77°E). For this purpose, TEC values estimated from these models have been compared with TEC values derived from dual-frequency Global Positioning System (GPS) data for the year 2011 (ascending phase of Solar Cycle 24). The results show that equatorial TEC exhibits semi-annual, annual, and seasonal variations with maximum values appearing during equinoctial months and minimum during solstitial months. Generally, ionospheric TEC produced by IRI and NeQuick 2 models are in good agreement with observed TEC. For diurnal variation, the IRI-2007 and NeQuick 2 models show good agreement during post-noon and post-midnight, respectively. Good correlation is observed during noon-time for all models. Disagreements between ionospheric models and observed TEC are found during post-sunset and post-midnight periods, with TEC deviation in the level of 11–14 TECU can be anticipated at 95% probability. On the other hand, TEC calculation from IRI-2012 is better than IRI-2007 and NeQuick 2 for monthly variation. All models score correlation coefficient above 0.9 with the highest correlation noticed during solstitial months. TEC deviation above 10 and up to 15 TECU can be expected in October with 95% probability. Overall, this work reveals that IRI and NeQuick 2 models are capable of predicting TEC with good correlation in most cases.
format	Article
author	Leong, S. K. Musa, T. A. Omar, K. Subari, M. D. Pathy, N. B. Asillam, M. F.
author_facet	Leong, S. K. Musa, T. A. Omar, K. Subari, M. D. Pathy, N. B. Asillam, M. F.
author_sort	Leong, S. K.
title	Assessment of ionosphere models at Banting: Performance of IRI-2007, IRI-2012 and NeQuick 2 models during the ascending phase of Solar Cycle 24
title_short	Assessment of ionosphere models at Banting: Performance of IRI-2007, IRI-2012 and NeQuick 2 models during the ascending phase of Solar Cycle 24
title_full	Assessment of ionosphere models at Banting: Performance of IRI-2007, IRI-2012 and NeQuick 2 models during the ascending phase of Solar Cycle 24
title_fullStr	Assessment of ionosphere models at Banting: Performance of IRI-2007, IRI-2012 and NeQuick 2 models during the ascending phase of Solar Cycle 24
title_full_unstemmed	Assessment of ionosphere models at Banting: Performance of IRI-2007, IRI-2012 and NeQuick 2 models during the ascending phase of Solar Cycle 24
title_sort	assessment of ionosphere models at banting: performance of iri-2007, iri-2012 and nequick 2 models during the ascending phase of solar cycle 24
publisher	Elsevier Ltd.
publishDate	2015
url	http://eprints.utm.my/id/eprint/57911/ http://www.dx.doi.org/10.1016/j.asr.2014.01.026
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score	13.211869

Assessment of ionosphere models at Banting: Performance of IRI-2007, IRI-2012 and NeQuick 2 models during the ascending phase of Solar Cycle 24

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