{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,23]],"date-time":"2026-03-23T13:40:52Z","timestamp":1774273252409,"version":"3.50.1"},"reference-count":34,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2023,4,12]],"date-time":"2023-04-12T00:00:00Z","timestamp":1681257600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Programme for European Cooperating States (PECS)","award":["4000128661\/19\/NL\/SC"],"award-info":[{"award-number":["4000128661\/19\/NL\/SC"]}]},{"name":"Programme for European Cooperating States (PECS)","award":["ZDA 2022\/24"],"award-info":[{"award-number":["ZDA 2022\/24"]}]},{"name":"University of Latvia","award":["4000128661\/19\/NL\/SC"],"award-info":[{"award-number":["4000128661\/19\/NL\/SC"]}]},{"name":"University of Latvia","award":["ZDA 2022\/24"],"award-info":[{"award-number":["ZDA 2022\/24"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>The geomagnetic storm on 17 March 2015 had a strong impact on the global navigation satellite systems (GNSS) positioning results in many GNSS Continuously Operating Reference Stations (CORS) in Europe. The analysis of global positioning system (GPS) observations in Latvian CORS stations discovered a strong impact of this space weather event over the whole country. The impact appeared as a moving cloud of positioning discrepancies across the country. However, the analysis of the days before 17 March revealed other smaller duration ionospheric scintillation events. The objective was to analyze the GPS positioning discrepancy cloud movement, total electron content (TEC), and rate of change of the TEC index (ROTI) relationships, as well as discrepancy statistics. The area of analysis on 16\u201318 March was increased by including the EGNOS ground-based Ranging and Integrity Monitoring Stations (RIMS): GVLA and GVLB, LAPA and LAPB, and WRSA and WRSB. The conclusion of the study is that each \u201cshot\u201d after 90 s gives a completely new cloud with a new impacted station subset, its configuration, and completely irregular discrepancy values.<\/jats:p>","DOI":"10.3390\/rs15082032","type":"journal-article","created":{"date-parts":[[2023,4,12]],"date-time":"2023-04-12T02:08:11Z","timestamp":1681265291000},"page":"2032","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["The Movement of GPS Positioning Discrepancy Clouds at a Mid-Latitude Region in March 2015"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3670-964X","authenticated-orcid":false,"given":"Janis","family":"Balodis","sequence":"first","affiliation":[{"name":"Institute of Geodesy and Geoinformatics, University of Latvia, LV-1586 Riga, Latvia"}]},{"given":"Madara","family":"Normand","sequence":"additional","affiliation":[{"name":"Institute of Geodesy and Geoinformatics, University of Latvia, LV-1586 Riga, Latvia"},{"name":"Department of Geomatics, Riga Technical University, LV-1048 Riga, Latvia"}]},{"given":"Ansis","family":"Zarins","sequence":"additional","affiliation":[{"name":"Institute of Geodesy and Geoinformatics, University of Latvia, LV-1586 Riga, Latvia"}]}],"member":"1968","published-online":{"date-parts":[[2023,4,12]]},"reference":[{"key":"ref_1","unstructured":"Dach, R., Lutz, S., Walser, P., and Fridez, P. (Bernese GNSS Software, 2015). Bernese GNSS Software, Version 5.2."},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Balodis, J., Normand, M., and Varna, I. (2021). Extreme Solar Events\u2019 Impact on GPS Positioning Results. Remote Sens., 13.","DOI":"10.3390\/rs13183624"},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"Guo, J., Li, W., Liu, X., Kong, Q., Zhao, C., and Guo, B. (2015). Temporal-Spatial Variation of Global GPS Derived Total Electron Content, 1999-2013. PLoS ONE, 10.","DOI":"10.1371\/journal.pone.0133378"},{"key":"ref_4","unstructured":"Coster, A.J. (2023, March 27). Space Weather and Its Effects on GNSS. Available online: http:\/\/cedar.openmadrigal.org\/index.html\/."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"263","DOI":"10.1007\/s00190-008-0266-1","article-title":"The IGS VTEC Maps: A Reliable Source of Ionospheric Information since 1998","volume":"83","author":"Juan","year":"2009","journal-title":"J. Geod."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"A31","DOI":"10.1051\/swsc\/2014028","article-title":"Near Real-Time Ionospheric Monitoring over Europe at the Royal Observatory of Belgium Using GNSS Data","volume":"4","author":"Bergeot","year":"2014","journal-title":"J. Space Weather. Space Clim."},{"key":"ref_7","unstructured":"Coster, A.J. (2023, March 27). Madrigal Database. Available online: https:\/\/www.unoosa.org\/documents\/pdf\/psa\/activities\/2022\/ISWI2022\/s8_07.pdf."},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Krypiak-Gregorczyk, A., Wielgosz, P., and Borkowski, A. (2017). Ionosphere Model for European Region Based on Multi-GNSS Data and TPS Interpolation. Remote Sens., 9.","DOI":"10.3390\/rs9121221"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"014001","DOI":"10.1088\/1361-6501\/aaefe5","article-title":"Assessment of Ionospheric Corrections for PPP-RTK Using Regional Ionosphere Modelling","volume":"30","author":"Psychas","year":"2019","journal-title":"Meas. Sci. Technol."},{"key":"ref_10","unstructured":"Dobelis, D., Zvirgzds, J., and Ka\u013cinka, M. (2017). IOP Conference Series: Materials Science and Engineering, Institute of Physics Publishing."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"012042","DOI":"10.1088\/1757-899X\/96\/1\/012042","article-title":"The Near Real Time Ionospheric Model of Latvia","volume":"96","author":"Zvirgzds","year":"2015","journal-title":"IOP Conf. Ser. Mater Sci. Eng."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1007\/s10291-022-01349-6","article-title":"High-Order Ionospheric Delay Correction of GNSS Data for Precise Reduced-Dynamic Determination of LEO Satellite Orbits: Cases of GOCE, GRACE, and SWARM","volume":"27","author":"Guo","year":"2023","journal-title":"GPS Solut."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"876","DOI":"10.1029\/2017RS006391","article-title":"Validation of ROTI for Ionospheric Amplitude Scintillation Measurements in a Low-Latitude Region Over Africa","volume":"53","author":"Olwendo","year":"2018","journal-title":"Radio Sci."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"10728","DOI":"10.1029\/2019JA026782","article-title":"Features of Storm-Induced Ionospheric Irregularities from Ground-Based and Spaceborne GPS Observations during the 2015 St. Patrick\u2019s Day Storm","volume":"124","author":"Zakharenkova","year":"2019","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"585","DOI":"10.1002\/2015SW001237","article-title":"Dynamics of the High-Latitude Ionospheric Irregularities during the 17 March 2015\u2009St. Patrick\u2019s Day Storm: Ground-Based GPS Measurements","volume":"13","author":"Cherniak","year":"2015","journal-title":"Space Weather"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"e2020SW002516","DOI":"10.1029\/2020SW002516","article-title":"Variations of TEC over Iberian Peninsula in 2015 Due to Geomagnetic Storms and Solar Flares","volume":"18","author":"Morozova","year":"2020","journal-title":"Space Weather"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"9023","DOI":"10.1002\/2015JA021629","article-title":"Ionospheric Response to the 2015 St. Patrick\u2019s Day Storm: A Global Multi-Instrumental Overview","volume":"120","author":"Astafyeva","year":"2015","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"A9","DOI":"10.1051\/swsc\/2016004","article-title":"Overview of the 2015 St. Patrick\u2019s Day Storm and Its Consequences for RTK and PPP Positioning in Norway","volume":"6","author":"Jacobsen","year":"2016","journal-title":"J. Space Weather Space Clim."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"727","DOI":"10.1002\/2015JA021832","article-title":"Profiles of Ionospheric Storm-enhanced Density during the 17 March 2015 Great Storm","volume":"121","author":"Liu","year":"2016","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"20180098","DOI":"10.1098\/rsta.2018.0098","article-title":"Ionospheric Response to Solar and Interplanetary Disturbances: A Swarm Perspective","volume":"377","author":"Balasis","year":"2019","journal-title":"Philos. Trans. R. Soc. A Math. Phys. Eng. Sci."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"e2019JA027681","DOI":"10.1029\/2019JA027681","article-title":"Global View of Ionospheric Disturbance Impacts on Kinematic GPS Positioning Solutions During the 2015 St. Patrick\u2019s Day Storm","volume":"125","author":"Yang","year":"2020","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"e2019RS007004","DOI":"10.1029\/2019RS007004","article-title":"Assessing the Positioning Performance Under the Effects of Strong Ionospheric Anomalies with Multi-GNSS in Hong Kong","volume":"55","author":"Lu","year":"2020","journal-title":"Radio Sci."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"448","DOI":"10.1002\/2016JA023171","article-title":"GPS Phase Scintillation at High Latitudes during the Geomagnetic Storm of 17\u201318 March 2015","volume":"121","author":"Prikryl","year":"2016","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Milanowska, B., Wielgosz, P., Krypiak-Gregorczyk, A., and Jarmo\u0142owski, W. (2021). Accuracy of Global Ionosphere Maps in Relation to Their Time Interval. Remote Sens., 13.","DOI":"10.3390\/rs13183552"},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"Magiera, W., V\u0101rna, I., Mitrofanovs, I., Silabrieds, G., Krawczyk, A., Skorupa, B., Apollo, M., and Maciuk, K. (2022). Accuracy of Code GNSS Receivers under Various Conditions. Remote Sens., 14.","DOI":"10.3390\/rs14112615"},{"key":"ref_26","unstructured":"Zvirgzds, J. (2012). Rational System LatPos [in Latvian], Riga Technical University."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"13","DOI":"10.3846\/13921541.2007.9636710","article-title":"Improvement and Extension of ETRS 89 in Latvia and Lithuania Based on the NKG 2003 GPS Campaign","volume":"33","author":"Jivall","year":"2007","journal-title":"Geod. Ir Kartogr."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"95","DOI":"10.1007\/s10291-019-0886-3","article-title":"Densification of the ITRF2014 Position and Velocity Solution in the Nordic and Baltic Countries","volume":"23","author":"Lahtinen","year":"2019","journal-title":"GPS Solut."},{"key":"ref_29","unstructured":"(2021, August 09). CODE Data Archive. Available online: ftp:\/\/ftp.unibe.ch\/aiub\/BSWUSER50\/ATM\/."},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Julien, O., Selmi, I., Pagot, J.-B., Samson, J., and Fernandez, F.A. (February, January 30). Extension of EWF Threat Model and Associated SQM. Proceedings of the 2017 International Technical Meeting of The Institute of Navigation, Monterey, CA, USA.","DOI":"10.33012\/2017.14873"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"L4","DOI":"10.3847\/2041-8213\/abb5f8","article-title":"Evidence of Cosmic-Ray Excess from Local Giant Molecular Clouds","volume":"901","author":"Baghmanyan","year":"2020","journal-title":"Astrophys. J."},{"key":"ref_32","unstructured":"C\u012brulis, J. (2007). Latvian: Matem\u0101tisk\u0101 Lo\u0123ika Un Kopu Teorija, Zvaigzne ABC."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"653","DOI":"10.1002\/2014RS005433","article-title":"Observation of the Ionospheric Irregularities over the Northern Hemisphere: Methodology and Service","volume":"49","author":"Cherniak","year":"2014","journal-title":"Radio Sci."},{"key":"ref_34","unstructured":"Douglas, A., David, M., Trevor, N.B., and Martin, J.G. (2000). Statistics with Confidence, British Medical Journal Books. [2nd ed.]."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/15\/8\/2032\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T19:14:22Z","timestamp":1760123662000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/15\/8\/2032"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,4,12]]},"references-count":34,"journal-issue":{"issue":"8","published-online":{"date-parts":[[2023,4]]}},"alternative-id":["rs15082032"],"URL":"https:\/\/doi.org\/10.3390\/rs15082032","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023,4,12]]}}}