M. Gende 1,2 , C. Brunini 1,2 , F. Azpilicueta 1,2 Universidad Nacional de La Plata, Argentina 1

1. La Plata Ionospheric Model as a tool for scientific and technological applications M. Gende1,2, C. Brunini1,2, F. Azpilicueta1,2 Universidad Nacional de La Plata, Argentina1 CONICET, Argentina 2

2. Outlook • LPIM model • SIRGAS-ION • Near real time data • LISN Project in Argentina • Conclusions and future work 2nd LISN Workshop. São José dos Campos. November 2011

3. LPIM model • Empirical • Meteorological • Total electron content • Global • Regional • Local 2nd LISN Workshop. São José dos Campos. November 2011

4. Data • Ground GPS receivers (CORS) • LEO GPS receivers • Topex and Jason 2nd LISN Workshop. São José dos Campos. November 2011

5. Observable • Dual frequency zero difference (RINEX) • L band 2nd LISN Workshop. São José dos Campos. November 2011

6. Observable • Even for the same satellite, two different arcs are generally affected by different levelling errors. • IFB can be affected by significant intra-day variations. • Levelling errors: 1.4 - 5.3 TECUs • Ciraolo L. et al. Calibration errors on experimental slant total electron content determined with GPS. Journal of Geodesy, Springer, (81) 2, 111-120, DOI: 10.1007/s00190-006-0093-1, 2007. 2nd LISN Workshop. São José dos Campos. November 2011

7. 2D modelling 2nd LISN Workshop. São José dos Campos. November 2011

8. MODIP • A new coordinate for modelling the F2-layer and the top-side ionosphere. Rawer (1984) 2nd LISN Workshop. São José dos Campos. November 2011

9. Global model CODE UPC LPIM • Azpilicueta F. et al. Global ionospheric maps from GPS observations using modip latitude’. Advances in Space Research, DOI: jasr-d-04-01245, 2006. • Gende, M. et al. Inter comparison of total electron content maps for the South American region, in International Union of Geodesy and Geophysics. 2007: Perugia, Italia. 2nd LISN Workshop. São José dos Campos. November 2011

10. SIRGAS • Starts as a geodetic project • Now is also producing atmospheric products • Regional TEC maps • Water vapor estimations • Can share with LISN CORS GNSS data • Generally not in real time • http://www.sirgas.org/ 2nd LISN Workshop. São José dos Campos. November 2011

11. http://cplat.fcaglp.unlp.edu.ar 2nd LISN Workshop. São José dos Campos. November 2011

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15. Tool to study climatologic conditions • Mosert, M. et al. Comparing IRI TEC prediction to GPS and digisond measurements at Ebro. Advances in Space Research, 2007. 39(5): p. 841-847. 2nd LISN Workshop. São José dos Campos. November 2011

16. Tool to study disturbed conditions • Sahai, Y. et al. Effects observed in the Latin American sector ionospheric F region during the intense geomagnetic disturbances in the early part of November 2004. Journal of Geophysical Research (Space Physics), 2009. 113(doi:10.1029/2007JA013007): p. 11. 2nd LISN Workshop. São José dos Campos. November 2011

17. Applications in GNSS navigation • Gende, M. et al., Ionospheric biases correction for coordinates derived from GPS single point positioning. Annals Of Geophysics, 2005. 48(3): p. 439-444. • Brunini, C. et al., Ionospheric Effects on Satellite Based Augmentation Systems (SBAS); WAAS, EGNOS, GAGAN, MSAS and future systems. in Bacon Satellite Symposium. 2004. Trieste, Italia. 2nd LISN Workshop. São José dos Campos. November 2011

18. Applications in geodetic positioning 2nd LISN Workshop. São José dos Campos. November 2011

21. Gende, M. et al. An ionospheric delay estimation technique to improve large baseline L1 differential positioning. in Dynamic Planet. IAG/IAPSO/IABO Joint Assembly. 2005. Cairns, Australia.

22. Near real time VTEC • Stations with permanent Internet access. • Five minutes double compress RINEX files (30 seconds interval rate). • Download central server using rsync. • Process with a delay of 5 minutes. • Run LPIM in local mode. • NTRIP is not implemented yet. 2nd LISN Workshop. São José dos Campos. November 2011

23. Corrientes 2nd LISN Workshop. São José dos Campos. November 2011

24. Ingesting TOPEX data • Bibbo, I., et al., Global vTEC Maps and instrumental DCB based on Combined GPS and TOPEX/Jason Measurements, in Coupling, Energetics, and Dynamics of Atmospheric Regions (CEDAR) workshop 2010. 2010: University of Colorado, Boulder, USA. 2nd LISN Workshop. São José dos Campos. November 2011

25. 3 D Modelling • Brunini, C. et al. Toward a SIRGAS service for mapping the ionosphere’s electron density distribution. in Geodesy for Planet Earth. 2010. Buenos Aires: International Association of Geodesy. 2nd LISN Workshop. São José dos Campos. November 2011

26. The actual state of the Argentinean component of the LISN project 2nd LISN Workshop. São José dos Campos. November 2011

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28. Problems • Intranet. No public and fix IP. • Internet interruptions. • Hard drives full. • Very low bandwidth. • Can not use the data for geodetic purpose. 2nd LISN Workshop. São José dos Campos. November 2011

29. Conclusions and future works • LPIM has more than a decade working as a tool for ionospheric studies • Is evolving towards a 4D model • More physical equations are being implemented in the program. • More data are being assimilating (TOPEX-JASON, LEO,…) • Modifications must be done so the program works as a filter and accepts NTRIP data 2nd LISN Workshop. São José dos Campos. November 2011

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