Assessment and Validation of Three Ionospheric Models (IRI‐2016, NeQuick2, and IGS‐GIM) From 2002 to 2018
Abstract It is important to confirm the accuracy and reliability of commonly used ionosphere models climatologically. In this contribution, International Global Navigation Satellite System Global Ionospheric Maps (IGSG) and two empirical models, that is, NeQuick2 and IRI‐2016, are assessed in detail...
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| Format: | Article |
| Language: | English |
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Wiley
2020-06-01
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| Series: | Space Weather |
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| Online Access: | https://doi.org/10.1029/2019SW002422 |
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| author | Jun Chen Xiaodong Ren Xiaohong Zhang Jincheng Zhang Liangke Huang |
| author_facet | Jun Chen Xiaodong Ren Xiaohong Zhang Jincheng Zhang Liangke Huang |
| author_sort | Jun Chen |
| collection | DOAJ |
| description | Abstract It is important to confirm the accuracy and reliability of commonly used ionosphere models climatologically. In this contribution, International Global Navigation Satellite System Global Ionospheric Maps (IGSG) and two empirical models, that is, NeQuick2 and IRI‐2016, are assessed in detail by applying different assessment methods, for example, Jason2/3 ionospheric data, difference of Slant Total Electron Content (dSTEC) data derived from Global Navigation Satellite System (GNSS) phase observation, and single‐frequency precise point positioning. Compared with IGSG, the biases mainly range from −10 to 10 Total Electron Content Unit (TECU), while they are between −5 and 5 TECU on solar low‐level days for empirical models. The hourly mean biases are about −2.7 and −2.5 TECU for IRI‐2016 and NeQuick2 models, respectively. Over the oceanic region, the mean biases for IRI‐2016 and NeQuick2 models relative to Jason2/3‐Vertical Total Electron Content (VTEC) are smaller than that of IGSG. The Root Mean Square (RMS) values are 4.8 and 6.0 TECU for IGSG and empirical models relative to Jason2‐VTEC while the values are 5.4 and 6.0 TECU with relative to Jason3‐VTEC. Compared with dSTEC values derived from the selected stations, the RMS values are about 1.8 and 2.6 TECU for IGSG and empirical models, respectively. In the positioning domain, the accuracy of single‐frequency precise point positioning corrected by the three models can reach 1 m in three‐dimensional direction. The positioning accuracy is 0.17 m corrected by IGSG and 0.50 m corrected by IRI‐2016 and NeQuick2 in the horizontal direction. |
| format | Article |
| id | doaj-art-43b47c3af0804d1595cc644879c9f19d |
| institution | Kabale University |
| issn | 1542-7390 |
| language | English |
| publishDate | 2020-06-01 |
| publisher | Wiley |
| record_format | Article |
| series | Space Weather |
| spelling | doaj-art-43b47c3af0804d1595cc644879c9f19d2025-01-14T16:30:43ZengWileySpace Weather1542-73902020-06-01186n/an/a10.1029/2019SW002422Assessment and Validation of Three Ionospheric Models (IRI‐2016, NeQuick2, and IGS‐GIM) From 2002 to 2018Jun Chen0Xiaodong Ren1Xiaohong Zhang2Jincheng Zhang3Liangke Huang4School of Geodesy and Geomatics Wuhan University Wuhan ChinaSchool of Geodesy and Geomatics Wuhan University Wuhan ChinaSchool of Geodesy and Geomatics Wuhan University Wuhan ChinaSchool of Geodesy and Geomatics Wuhan University Wuhan ChinaCollege of Geomatics and Geoinformation Guilin University of Technology Guilin ChinaAbstract It is important to confirm the accuracy and reliability of commonly used ionosphere models climatologically. In this contribution, International Global Navigation Satellite System Global Ionospheric Maps (IGSG) and two empirical models, that is, NeQuick2 and IRI‐2016, are assessed in detail by applying different assessment methods, for example, Jason2/3 ionospheric data, difference of Slant Total Electron Content (dSTEC) data derived from Global Navigation Satellite System (GNSS) phase observation, and single‐frequency precise point positioning. Compared with IGSG, the biases mainly range from −10 to 10 Total Electron Content Unit (TECU), while they are between −5 and 5 TECU on solar low‐level days for empirical models. The hourly mean biases are about −2.7 and −2.5 TECU for IRI‐2016 and NeQuick2 models, respectively. Over the oceanic region, the mean biases for IRI‐2016 and NeQuick2 models relative to Jason2/3‐Vertical Total Electron Content (VTEC) are smaller than that of IGSG. The Root Mean Square (RMS) values are 4.8 and 6.0 TECU for IGSG and empirical models relative to Jason2‐VTEC while the values are 5.4 and 6.0 TECU with relative to Jason3‐VTEC. Compared with dSTEC values derived from the selected stations, the RMS values are about 1.8 and 2.6 TECU for IGSG and empirical models, respectively. In the positioning domain, the accuracy of single‐frequency precise point positioning corrected by the three models can reach 1 m in three‐dimensional direction. The positioning accuracy is 0.17 m corrected by IGSG and 0.50 m corrected by IRI‐2016 and NeQuick2 in the horizontal direction.https://doi.org/10.1029/2019SW002422IRI‐2016NeQuickGlobal Ionosphere Map (GIM)JasonGNSS |
| spellingShingle | Jun Chen Xiaodong Ren Xiaohong Zhang Jincheng Zhang Liangke Huang Assessment and Validation of Three Ionospheric Models (IRI‐2016, NeQuick2, and IGS‐GIM) From 2002 to 2018 Space Weather IRI‐2016 NeQuick Global Ionosphere Map (GIM) Jason GNSS |
| title | Assessment and Validation of Three Ionospheric Models (IRI‐2016, NeQuick2, and IGS‐GIM) From 2002 to 2018 |
| title_full | Assessment and Validation of Three Ionospheric Models (IRI‐2016, NeQuick2, and IGS‐GIM) From 2002 to 2018 |
| title_fullStr | Assessment and Validation of Three Ionospheric Models (IRI‐2016, NeQuick2, and IGS‐GIM) From 2002 to 2018 |
| title_full_unstemmed | Assessment and Validation of Three Ionospheric Models (IRI‐2016, NeQuick2, and IGS‐GIM) From 2002 to 2018 |
| title_short | Assessment and Validation of Three Ionospheric Models (IRI‐2016, NeQuick2, and IGS‐GIM) From 2002 to 2018 |
| title_sort | assessment and validation of three ionospheric models iri 2016 nequick2 and igs gim from 2002 to 2018 |
| topic | IRI‐2016 NeQuick Global Ionosphere Map (GIM) Jason GNSS |
| url | https://doi.org/10.1029/2019SW002422 |
| work_keys_str_mv | AT junchen assessmentandvalidationofthreeionosphericmodelsiri2016nequick2andigsgimfrom2002to2018 AT xiaodongren assessmentandvalidationofthreeionosphericmodelsiri2016nequick2andigsgimfrom2002to2018 AT xiaohongzhang assessmentandvalidationofthreeionosphericmodelsiri2016nequick2andigsgimfrom2002to2018 AT jinchengzhang assessmentandvalidationofthreeionosphericmodelsiri2016nequick2andigsgimfrom2002to2018 AT liangkehuang assessmentandvalidationofthreeionosphericmodelsiri2016nequick2andigsgimfrom2002to2018 |