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Modelling the Ionosphere over Europe: Investigation of NeQuick Formulation

Modelling the Ionosphere over Europe: Investigation of NeQuick Formulation. Benoît Bidaine 1 - F.R.S.-FNRS - B.Bidaine@ulg.ac.be Prof. René Warnant 1,2 - R.Warnant@oma.be 1 University of Liège (Unit of Geomatics), Belgium - www.geo.ulg.ac.be

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Modelling the Ionosphere over Europe: Investigation of NeQuick Formulation

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  1. Modelling the Ionosphere over Europe: Investigation of NeQuick Formulation Benoît Bidaine1 - F.R.S.-FNRS - B.Bidaine@ulg.ac.be Prof. René Warnant1,2 - R.Warnant@oma.be 1University of Liège (Unit of Geomatics), Belgium - www.geo.ulg.ac.be 2Royal Meteorological Institute, Belgium - www.meteo.be November 18th, 2008 5th European Space Weather Week (Brussels, Belgium) Modelling the Ionosphere over Europe: Investigation of NeQuick Formulation Modelling the Ionosphere over Europe: Investigation of NeQuick Formulation Modelling the Ionosphere over Europe: Investigation of NeQuick Formulation Modelling the Ionosphere over Europe: Investigation of NeQuick Formulation Modelling the Ionosphere over Europe: Investigation of NeQuick Formulation Benoît Bidaine1 - F.R.S.-FNRS - B.Bidaine@ulg.ac.be Prof. René Warnant1,2 - R.Warnant@oma.be 1University of Liège (Unit of Geomatics), Belgium - www.geo.ulg.ac.be 2Royal Meteorological Institute, Belgium - www.meteo.be Benoît Bidaine1 - F.R.S.-FNRS - B.Bidaine@ulg.ac.be Prof. René Warnant1,2 - R.Warnant@oma.be 1University of Liège (Unit of Geomatics), Belgium - www.geo.ulg.ac.be 2Royal Meteorological Institute, Belgium - www.meteo.be Benoît Bidaine1 - F.R.S.-FNRS - B.Bidaine@ulg.ac.be Prof. René Warnant1,2 - R.Warnant@oma.be 1University of Liège (Unit of Geomatics), Belgium - www.geo.ulg.ac.be 2Royal Meteorological Institute, Belgium - www.meteo.be

  2. Ionosphere T E C Total Electron Content TEC

  3. TEC has to be modelled for single frequency receivers. • GALILEO algorithm usingNeQuick model • Validate and improve  algorithm  NeQuick 1  2 First step: let’s investigate NeQuick profile formulation.

  4. NeQuick 2 improves TEC estimation over Europe. 1. Tools and Method Modelling and measuring the ionosphere

  5. NeQuick 2 improves TEC estimation over Europe. 1. Tools and Method Modelling and measuring the ionosphere 2. Yearly Statistics Global scheme

  6. NeQuick 2 improves TEC estimation over Europe. 1. Tools and Method Modelling and measuring the ionosphere 2. Yearly Statistics Global scheme 3. Influence of k Unification Main modification in NeQuick 2

  7. NeQuick 2 improves TEC estimation over Europe. 1. Tools and Method Modelling and measuring the ionosphere 2. Yearly Statistics Global scheme 3. Influence of k Unification Main modification in NeQuick 2 4. TEC Splitting Distinguishing bottomside and topside

  8. 1. Tools and Method 2. Yearly Statistics 3. Influence of k Unification 4. TEC Splitting

  9. 1. Tools and Method NeQuick is an empirical « profiler ». ICTP / U Graz / COST 296 and before • Output = Ne  TEC with integration • Layer peaks = anchor points  monthly median maps • NeQuick 2 (Nava et al., 2008)  topside modification Topside h [km] Bottomside Ne [e- m-3]

  10. 1. Tools and Method We investigate NeQuick formulationusing collocated data. • Actual measurements instead of monthly median maps  constrain by means of ionosonde data  manuallyvalidated digisonde data • Modelled vertical TEC vs GPS TEC  collocated ionosonde and GPS receiver  GIM levelling (Orus et al., 2007) 1TECu  16 cm error for L1

  11. 1. Tools and Method We focus on mid-latitudesand high solar activity. • Year 2002 (HSA) • Three European locations with (nearly) collocated digisonde and IGS/EUREF station

  12. 1. Tools and Method 2. Yearly Statistics 3. Influence of k Unification 4. TEC Splitting

  13. 2. Yearly Statistics TEC modelling improveson a yearly basis. Yearly TEC mean • TEC underestimated on average • (! potential bias in GPS TEC data !) • Bigger (around 20%) underestimation with NeQuick 2

  14. 2. Yearly Statistics TEC modelling improveson a yearly basis. Yearly relative TEC standard deviation • Lower (around 20%) standard deviationwith NeQuick 2

  15. 1. Tools and Method 2. Yearly Statistics 3. Influence of k Unification 4. TEC Splitting

  16. 3. Influence of k Unification The topside shape parameter k was unified in NeQuick 2. • k involved in height-dependent scale height • NeQuick 1: 2 formulas for k (April to September and October to March) •  different statistics for each period • NeQuick 2: 1 formula based on topside soundings

  17. 3. Influence of k Unification The improvement comes mainly from the topside modification. Evolution of TEC standard deviation from NeQuick 1 to 2 • October to March: lower (15%) standard deviation with NeQuick 2 •  More homogenous with other period

  18. 1. Tools and Method 2. Yearly Statistics 3. Influence of k Unification 4. TEC Splitting

  19. 4. TEC Splitting The topside plays a major role. • Integrate bottomside Ne profile from digisonde •  bottomside TEC • Subtract to GPS TEC  topside TEC • Big proportion of TEC within topside (3/4, 1/4)

  20. 4. TEC Splitting The improvement comes mainly from the topside modification. Yearly topside TEC standard deviation • Bias/standard deviation evolution for topside between NeQuick versions corresponding to global statistics

  21. NeQuick 2 improves TEC estimation over Europe. • Benefit from collocated data • TEC statistics: standard deviation decrease by 20% to reach less than 20% with NeQuick 2 (mid-latitudes stations, high SA) • Homogenisation thanks to topside modification • Major role of topside

  22. TEC has to be modelled for single frequency receivers. • Comparison of different GPSTEC data sets • Ingestion: use of effective parameters to adapt NeQuick TEC to GPS TEC • GALILEO Single Frequency Ionospheric Correction Algorithm

  23. Ionosphere

  24. Modelling the Ionosphere over Europe: Investigation of NeQuick Formulation Benoît Bidaine1 - F.R.S.-FNRS - B.Bidaine@ulg.ac.be Prof. René Warnant1,2 - R.Warnant@oma.be 1University of Liège (Unit of Geomatics), Belgium - www.geo.ulg.ac.be 2Royal Meteorological Institute, Belgium - www.meteo.be November 18th, 2008 5th European Space Weather Week (Brussels, Belgium) Modelling the Ionosphere over Europe: Investigation of NeQuick Formulation Modelling the Ionosphere over Europe: Investigation of NeQuick Formulation Modelling the Ionosphere over Europe: Investigation of NeQuick Formulation Modelling the Ionosphere over Europe: Investigation of NeQuick Formulation Modelling the Ionosphere over Europe: Investigation of NeQuick Formulation Benoît Bidaine1 - F.R.S.-FNRS - B.Bidaine@ulg.ac.be Prof. René Warnant1,2 - R.Warnant@oma.be 1University of Liège (Unit of Geomatics), Belgium - www.geo.ulg.ac.be 2Royal Meteorological Institute, Belgium - www.meteo.be Benoît Bidaine1 - F.R.S.-FNRS - B.Bidaine@ulg.ac.be Prof. René Warnant1,2 - R.Warnant@oma.be 1University of Liège (Unit of Geomatics), Belgium - www.geo.ulg.ac.be 2Royal Meteorological Institute, Belgium - www.meteo.be Benoît Bidaine1 - F.R.S.-FNRS - B.Bidaine@ulg.ac.be Prof. René Warnant1,2 - R.Warnant@oma.be 1University of Liège (Unit of Geomatics), Belgium - www.geo.ulg.ac.be 2Royal Meteorological Institute, Belgium - www.meteo.be

  25. 1. Tools and Method We investigate NeQuick formulationusing collocated data.

  26. 1. Tools and Method We investigate NeQuick formulationusing collocated data. sTEC differences averaged by arc (Brussels – 2002)

  27. 1. Tools and Method We investigate NeQuick formulationusing collocated data. Elevation filter (Brussels – March 28th, 2002)

  28. 1. Tools and Method We investigate NeQuick formulationusing collocated data. Impact of elevation filter thanks to NeQuick simulations (Brussels – March 28th, 2002)

  29. 3. Influence of k Unification The topside shape parameter k was unified in NeQuick 2. Monthly TEC mean (Roquetes - 2002)

  30. 3. Influence of k Unification The topside shape parameter k was unified in NeQuick 2. Monthly TEC standard deviation (Roquetes - 2002)

  31. 3. Influence of k Unification The improvement comes mainly from the topside modification. Daily TEC profile (El Arenosillo - February 12th, 2002)

  32. 3. Influence of k Unification The improvement comes mainly from the topside modification. Ne profile (El Arenosillo - February 12th, 2002 – 10 UT)

  33. TEC has to be modelledfor single frequency receivers. • PhD thesis at ULg – Unit of Geomatics sponsored by FNRS • Collaborations - RMI (Brussels) - ESA/ESTEC (Noordwijk) - ICTP (Trieste, Italy) - Others to come… After coffee break + posters

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