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

ProductsF. CRESPON, E. JEANSOU, J. HELBERT, G. MOREAUX (NOVELTIS)

P. LOGNONNE (IPGP)R. GARCIA (OMP)

Contact: francois.crespon@noveltis.fr

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Summary

SPECTRE service

Applications

Conclusions

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Description of SPECTRE service

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SPECTRE service

SPECTRE Service: design

GPSObservations(300 stations)

TEC computationat every piercing point

TEC interpolationon grid points

+TGDs, IFBs

Kalman filtering

Productdatabase

End UsersWebsite FTP

A tens of data servers: IGS servers (world)

EUREF servers (Europe)

IGN server (France)

ASI server (Italia)

ICC server (Spain)

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SPECTRE service

GPS

Network of bi-frequency receivers

Ionosphere

Piercingpoints

~350 km

Computation: IPP positions

Obliquity factor

Ionospheric combination

SPECTRE Service: design

GPSObservations(300 stations)

TEC computationat every piercing point

TEC interpolationon grid points

+TGDs, IFBs

Kalman filtering

Productdatabase

End UsersWebsite FTP

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SPECTRE service

Computation: TEC maps (2.5°x2.5°x30s, 15 min., 1h)

Relative error maps

Electronic biases (IFB,TGD)

Relative errors for IFB and TGD

SPECTRE Service: design

GPSObservations(300 stations)

TEC computationat every piercing point

TEC interpolationon grid points

+TGDs, IFBs

Kalman filtering

Productdatabase

End UsersWebsite FTP

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SPECTRE service

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

SPECTRE Service: products and users

GPSObservations(300 stations)

TEC computationat every piercing point

TEC interpolationon grid points

+TGDs, IFBs

Kalman filtering

Productdatabase

End UsersWebsite FTP

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SPECTRE service

SPECTRE Service: products and users

GPSObservations(300 stations)

TEC computationat every piercing point

TEC interpolationon grid points

+TGDs, IFBs

Kalman filtering

Productdatabase

End UsersWebsite FTP

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

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SPECTRE service

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

SPECTRE Service: products validation

GPSObservations(300 stations)

TEC computationat every piercing point

TEC interpolationon grid points

+TGDs, IFBs

Kalman filtering

Productdatabase

End UsersWebsite FTP

Comparison with ionosondes (7 month data)

ROME ATHENS TORTOSA CHILTON JULIUSRUH PRUHONICE TROMSO

JPL -1.45 -0.66 -1.92 -1.25 -0.91 -0.79 -1.08

CODE -3.36 -2.55 -4.01 -3.60 -3.42 -2.92 -3.58

UPC -4.10 -3.54 -4.36 -2.66 -1.93 -2.28 -2.24

IGS -3.21 -2.45 -3.67 -2.72 -2.28 -2.25 -2.41

SPECTRE 0.53 1.15 -0.02 -0.15 0.32 0.40 -1.06

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SPECTRE service

SPECTRE Service: support and maintenance

GPSObservations(300 stations)

TEC computationat every piercing point

TEC interpolationon grid points

+TGDs, IFBs

Kalman filtering

Productdatabase

End UsersWebsite FTP

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)

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Applications of SPECTRE products

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Applications

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

tsunami

ionosphere

Courtesy of IPGP

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Applications

Geomagnetic storms : Remote sensing of ionospheric perturbations

Additional data for regional geomagnetic storm warning

Courtesy of WDC, Kyoto

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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.

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Conclusion

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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),