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: [email protected]
Summary
 SPECTRE service
 Applications
 Conclusions
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Description of SPECTRE service
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SPECTRE service
SPECTRE Service: design
GPS
Observations
(300 stations)
TEC computation
at every piercing point
TEC interpolation
on grid points
+
TGDs, IFBs
Kalman filtering
Product
database
Website
FTP
End Users
 A tens of data servers:
 IGS servers (world)
 EUREF servers (Europe)
 IGN server (France)
 ASI server (Italia)
 ICC server (Spain)
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November 17 th-21th, 2008
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SPECTRE service
SPECTRE Service: design
GPS
Observations
(300 stations)
TEC computation
at every piercing point
 Computation:
 IPP positions
 Obliquity factor
TEC interpolation
on grid points
+
TGDs, IFBs
Kalman filtering
Product
database
GPS
Website
FTP
End Users
Piercing
points
Ionosphere
 Ionospheric combination
~350 km
Network of bi-frequency receivers
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November 17 th-21th, 2008
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SPECTRE service
SPECTRE Service: design
GPS
Observations
(300 stations)
TEC computation
at every piercing point
TEC interpolation
on grid points
+
TGDs, IFBs
Kalman filtering
Product
database
Website
FTP
End Users
 Computation:
 TEC maps (2.5°x2.5°x30s, 15 min., 1h)
 Relative error maps
 Electronic biases (IFB,TGD)
 Relative errors for IFB and TGD
NOV-3666-SL-6636
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November 17 th-21th, 2008
© Noveltis 2008
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SPECTRE service
SPECTRE Service: products and users
GPS
Observations
(300 stations)
TEC computation
at every piercing point
TEC interpolation
on grid points
+
TGDs, IFBs
Kalman filtering
Product
database
Website
FTP
End 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
NOV-3666-SL-6636
ESWW5, Brussels, Belgium
November 17 th-21th, 2008
© Noveltis 2008
This document is the property of Noveltis, no part of it shall be reproduced or transmitted without the express prior written authorisation of Noveltis
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SPECTRE service
SPECTRE Service: products and users
GPS
Observations
(300 stations)
TEC computation
at every piercing point
TEC interpolation
on grid points
+
TGDs, IFBs
Kalman filtering
Product
database
Website
FTP
End 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
NOV-3666-SL-6636
ESWW5, Brussels, Belgium
November 17 th-21th, 2008
© Noveltis 2008
This document is the property of Noveltis, no part of it shall be reproduced or transmitted without the express prior written authorisation of Noveltis
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SPECTRE service
SPECTRE Service: products validation
GPS
Observations
(300 stations)
TEC interpolation
on grid points
+
TGDs, IFBs
Kalman filtering
TEC computation
at every piercing point
Product
database
Website
FTP
End Users
 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)
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
GPS
Observations
(300 stations)
TEC interpolation
on grid points
+
TGDs, IFBs
Kalman filtering
TEC computation
at every piercing point
Product
database
Website
FTP
End Users
 Support (required by users)
 Maintenance
 Reprocess of the database
 Improvements of TEC maps display
 Update of SPECTRE website
 Process of period before the service start
(October 2003)
 Update of code source
 Providing products to SWENET portal
 Latest publication on service performances
(October 2007)
 Latest version : 4.3 (June 2008)
 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
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November 17 th-21th, 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
ionosphere
tsunami
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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November 17 th-21th, 2008
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Conclusion
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November 17 th-21th, 2008
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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),
NOV-3666-SL-6636
ESWW5, Brussels, Belgium
November 17 th-21th, 2008
© Noveltis 2008
This document is the property of Noveltis, no part of it shall be reproduced or transmitted without the express prior written authorisation of Noveltis
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