SPECTRE (noveltis.fr/spectre): A Web Service for Ionospheric Products

1. SPECTRE (www.noveltis.fr/spectre): A Web Service for Ionospheric Products F. CRESPON, E. JEANSOU, J. HELBERT, G. MOREAUX (NOVELTIS) P. LOGNONNE (IPGP) R. GARCIA (OMP) Contact: francois.crespon@noveltis.fr

2. Summary • SPECTRE service • Applications • Conclusions

3. Description of SPECTRE service

4. SPECTRE service Product database TEC interpolation on grid points + TGDs, IFBs Kalman filtering GPS Observations (300 stations) Website FTP End Users TEC computation at every piercing point SPECTRE Service: design • A tens of data servers: • IGS servers (world) • EUREF servers (Europe) • IGN server (France) • ASI server (Italia) • ICC server (Spain)

5. SPECTRE service Product database TEC interpolation on grid points + TGDs, IFBs Kalman filtering GPS Observations (300 stations) Website FTP End Users TEC computation at every piercing point Piercing points GPS Ionosphere ~350 km Network of bi-frequency receivers SPECTRE Service: design • Computation: • IPP positions • Obliquity factor • Ionospheric combination

6. SPECTRE service Product database TEC interpolation on grid points + TGDs, IFBs Kalman filtering GPS Observations (300 stations) Website FTP End Users TEC computation at every piercing point SPECTRE Service: design • Computation: • TEC maps (2.5°x2.5°x30s, 15 min., 1h) • Relative error maps • Electronic biases (IFB,TGD) • Relative errors for IFB and TGD

7. SPECTRE service Product database TEC interpolation on grid points + TGDs, IFBs Kalman filtering GPS Observations (300 stations) Website FTP End Users TEC computation at every piercing point SPECTRE Service: products and users • Raw STEC products: • IPP positions, • Obliquity factor, • Ionospheric combination, • IFB, TGD. • VTEC maps: • TEC maps at 30s, • TEC maps at 15 min, • TEC maps at 1h. • Website: http://www.noveltis.net/spectre

8. SPECTRE service Product database TEC interpolation on grid points + TGDs, IFBs Kalman filtering GPS Observations (300 stations) Website FTP End Users TEC computation at every piercing point SPECTRE Service: products and users • Raw STEC products: • IPP positions • Obliquity factor • Ionospheric combination • IFB, TGD • VTEC maps: • TEC maps at 30s • TEC maps at 15 min. • TEC maps at 1h • Website: http://www.noveltis.net/spectre

9. SPECTRE service Product database TEC interpolation on grid points + TGDs, IFBs Kalman filtering GPS Observations (300 stations) Website FTP End Users TEC computation at every piercing point SPECTRE Service: products validation • Comparison with satellite altimeters (7 month data) • Jason: bias ~ 0.66 TECu • TOPEX: bias ~ -0.36 TECu • ENVISAT: bias ~ 5.95 TECu • Coherent with JPL / CODE / UPC / IGS global TEC maps • Comparison with ionosondes (7 month data)

10. SPECTRE service Product database TEC interpolation on grid points + TGDs, IFBs Kalman filtering GPS Observations (300 stations) Website FTP End Users TEC computation at every piercing point SPECTRE Service: support and maintenance • Support (required by users) • Improvements of TEC maps display • Process of period before the service start (October 2003) • Extraction of Raw Products for few stations • Development of dedicated package for IPGP (read of new GPS data format) • Improvement of SPECTRE service for SWENET portal (timestamp for SWENET importer) • Communications about service status • Maintenance • Reprocess of the database • Update of SPECTRE website • Update of code source • Providing products to SWENET portal • Latest publication on service performances (October 2007) • Latest version : 4.3 (June 2008)

11. Applications of SPECTRE products

12. Applications ionosphere tsunami • Ionospheric seismology: • Remote sensing of ionospheric waves induced by earthquakes • Estimation of rupture parameters: velocity, direction, azimut of fault • Estimation of margins features: velocity of rayleigh waves • Remote sensing of ionospheric waves induced by tsunami • Early warning system concept Courtesy of IPGP

13. Applications • Geomagnetic storms : • Remote sensing of ionospheric perturbations • Additional data for regional geomagnetic storm warning Courtesy of WDC, Kyoto

14. Applications • Perspectives of markets for space weather services: • Space agencies  Preliminary considerations for missions. • Space industry  Instruments design / specifications. • Space Ground segment  Data correction (post-processing). • Electric companies / energy transport  Geomagnetic induced current. • Meteorological agencies  Improvement of forecast models (gravity waves). • Defence  HF communications, radars operation. • Research institutes  Seismology, Climatology, Data assimilation for space weather models. • Geographical survey  Confirmation of tsunami alert, rescue deployment. • Insurance  Expertise in case of injured persons, damaged equipments, etc. • Tourism  Auroras prediction, space tourism.

15. Conclusion

16. Conclusions • SWENET pilot project: SPECTRE service • Set up operational service: production of TEC maps since April 2004 ! • « User oriented » space weather application: http://www.noveltis.net/spectre • 20 registered users from France, India, Indonesia, Morocco, Russia, Spain, Switzerland, USA, UK, Ukraine. • Service maintenance and support is now achieved with our own funding. • Service validation • SPECTRE TEC maps were compared to GIMs (JPL,UPC,CODE,IGS), ionosondes and satellite altimeter measurements, • Good performances in estimating absolute TEC and ionosphere dynamics. • Service applications • Scientific use of SPECTRE products, • Need to improve service to catch commercial users: • Nowcast (real time GPS), forecast (data assimilation in dedicated model),