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Gro
up
Present and future
orki
ng G Present and future
IGS Ionospheric products
eric
Wo
Andrzej Krankowski, Manuel Hernández-Pajares,
Joachim Feltens Attila Komjathy Stefan Schaer
nosp
he Joachim Feltens, Attila Komjathy, Stefan Schaer,
Alberto García-Rigo, Pawel Wielgosz
IGS
Ion
I
Krankowski et al.
OutlineG
roup
Introduction
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IGS IONO WG activities
Current performance of IGS global TEC maps
eric
Wo Current performance of IGS global TEC maps
Updates and future plans
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Summary
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IGS
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Krankowski et al.
IntroductionInternational GNSS Service - IGSG
roup
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IGS directly manages ~400 permanent GNSS stations
IGS
Ion y g p
observing 4-12 satellites at 30 s rate: more than 250,000 STEC observations/hour worldwide, but there is lack of
stations at some areas (e g over the oceans)I
Krankowski et al. 3
stations at some areas (e.g., over the oceans)
IGS IONO WG activities
Th IGS I h W ki
Gro
up
The IGS Ionosphere Working groupstarted its activities in June 1998 withthe main goal of a routinelyproducing IGS Global TEC maps.
The IGS ionosphere product is aresult of the combination of TECmaps derived by different AnalysisCenters by using weights
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This is being done now with a latencyof 11 days (final product) and with alatency of less than 24 hours (rapid
d t)
Centers by using weightscomputed by Validation Center, inorder to get a more accurateproduct.
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GNSS data
JASONTEC dataThis has been done under the
direct responsibility of the
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IGSIonosphere
Analysis Centers IGS
Ionosphere
CODEESAJPLUPC
d po b y oIono-WG chairmans:
1. Dr Joachim Feltens, ESA1998–2002,
IGS
Ion Ionosphere
Validation Center
IGSIonosphere UPC
,
2. Dr Manuel Hernández-Pajares, UPC, 2002–2007
3 Dr Andrzej KrankowskiI
Krankowski et al.
IGSIonosphere
CombinationCenter
pMaps
UWM
UPC3. Dr. Andrzej Krankowski,UWM, 2008-
Determining VTEC in a global network: main problem: lack of data - South and Oceans
Gro
upIt can be seen thatthe typical “holes” appearing at the first
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stage of the global maps computation (each 2 hours). This requires an optimum
eric
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spatial-temporal interpolation technique to cover all the
nosp
heIonosphere.
IGS
Ion
Lack of data over the equatorial Africa and Atlantic and inI
Krankowski et al. 5
Lack of data over the equatorial Africa and Atlantic, and in part over equatorial and southern Pacific, hamper the detection of the equatorial anomalies (June 13, 2004).
Example of IGS Final GIM: 2010-141 DOYTEC map
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idi ( t 2 h 5
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deg. x 2.5 deg in UT x Lon. xLat.), weights and external(altimetry-derived) TEC data.
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RMS map
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he From such maps andweights the CombinationCenter (at first ESA, thenUPC, and since 2008 -
IGS
Ion UPC, and since 2008
UWM) has produced theIGS TEC maps in IONEXformat.
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Krankowski et al.
Units: TECU
Example of IGS RAPID GIM: 2010-141 DOYTEC maps RMS maps
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TEC maps RMS maps
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Units: 0.1 TECUs
The IONEX format bodyG
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1 START OF TEC MAP 2004 4 27 0 0 0 EPOCH OF CURRENT MAP87.5-180.0 180.0 5.0 450.0 LAT/LON1/LON2/DLON/H