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Modelling the Ionosphere over Europe:Investigation of NeQuick Formulation
Benoît Bidaine1 - F.R.S.-FNRS - [email protected]. René Warnant1,2 - [email protected]
1University of Liège (Unit of Geomatics), Belgium - www.geo.ulg.ac.be2Royal Meteorological Institute, Belgium - www.meteo.be
November 18th, 20085th European Space Weather Week (Brussels, Belgium)
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TEC
Ionosphere
Total Electron Content CET
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algorithm NeQuick 1 2
TEC has to be modelled for single frequency receivers.
• GALILEO algorithm usingNeQuick model
First step: let’s investigate NeQuick profile formulation.
• Validate and improve
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1. Tools and MethodModelling and measuring the ionosphere
NeQuick 2 improvesTEC estimation over Europe.
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NeQuick 2 improvesTEC estimation over Europe.
1. Tools and Method
2. Yearly StatisticsGlobal scheme
Modelling and measuring the ionosphere
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NeQuick 2 improvesTEC estimation over Europe.
3. Influence of k UnificationMain modification in NeQuick 2
1. Tools and Method
2. Yearly StatisticsGlobal scheme
Modelling and measuring the ionosphere
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NeQuick 2 improvesTEC estimation over Europe.
3. Influence of k UnificationMain modification in NeQuick 2
1. Tools and Method
2. Yearly StatisticsGlobal scheme
Modelling and measuring the ionosphere
4. TEC SplittingDistinguishing bottomside and topside
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3. Influence of k Unification
1. Tools and Method
2. Yearly Statistics
4. TEC Splitting
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NeQuick is an empirical « profiler ».
• Output = Ne
TEC with integration
• Layer peaks= anchor points
monthly median maps
• NeQuick 2 (Nava et al., 2008)
topside modification
h [km]
Ne [e- m-3]
1. Tools and Method
Bottomside
Topside
ICTP / U Graz / COST 296 and before
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We investigate NeQuick formulationusing collocated data.
• Actual measurements instead of monthly median maps constrain by means of ionosonde data manually validated 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
1. Tools and Method
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We focus on mid-latitudesand high solar activity.
• Year 2002 (HSA)
• Three European locations with (nearly) collocated digisonde and IGS/EUREF station
1. Tools and Method
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3. Influence of k Unification
1. Tools and Method
2. Yearly Statistics
4. TEC Splitting
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TEC modelling improveson a yearly basis.
2. Yearly Statistics
0
5
10
15
20
25
30
35
40
El Arenosillo/San Fernando Roquetes Dourbes
TEC
[TEC
u]
Measured NeQuick 1 NeQuick 2
• TEC underestimated on average(! potential bias in GPS TEC data !)
• Bigger (around 20%) underestimation with NeQuick 2
Yearly TEC mean
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TEC modelling improveson a yearly basis.
2. Yearly Statistics
Yearly relative TEC standard deviation
0%
5%
10%
15%
20%
25%
30%
El Arenosillo/San Fernando Roquetes Dourbes
TEC
[%]
NeQuick 1 NeQuick 2
• Lower (around 20%) standard deviation with NeQuick 2
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3. Influence of k Unification
1. Tools and Method
2. Yearly Statistics
4. TEC Splitting
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The topside shape parameter k was unified in NeQuick 2.
3. Influence of k Unification
• 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
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The improvement comes mainly from the topside modification.
• October to March: lower (15%) standard deviation with NeQuick 2
More homogenous with other period
3. Influence of k Unification
-30%
-25%
-20%
-15%
-10%
-5%
0%
5%
10%
El Arenosillo/San Fernando Roquetes Dourbes
Evol
ution
April to September October to March
Evolution of TEC standard deviation from NeQuick 1 to 2
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3. Influence of k Unification
1. Tools and Method
2. Yearly Statistics
4. TEC Splitting
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The topside plays a major role.
• Integrate bottomside Ne profile from digisonde
bottomside TEC
• Subtract to GPS TEC topside TEC
4. TEC Splitting
0
5
10
15
20
25
30
35
40
El Arenosillo/San Fernando Dourbes
TEC
[TEC
u]
Bottomside Topside
• Big proportion of TEC within topside (3/4, 1/4)
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The improvement comes mainly from the topside modification.
• Bias/standard deviation evolution for topside between NeQuick versions corresponding to global statistics
4. TEC Splitting
Yearly topside TEC standard deviation
0
1
2
3
4
5
6
7
8
9
El Arenosillo/San Fernando Dourbes
TEC
[TEC
u]
NeQuick 1 NeQuick 2
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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
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TEC has to be modelled for single frequency receivers.
• Comparison of different GPS TEC data sets
• Ingestion: use of effective parameters to adapt NeQuick TEC to GPS TEC
• GALILEO Single Frequency Ionospheric Correction Algorithm
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Ionosphere
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Modelling the Ionosphere over Europe:Investigation of NeQuick Formulation
Benoît Bidaine1 - F.R.S.-FNRS - [email protected]. René Warnant1,2 - [email protected]
1University of Liège (Unit of Geomatics), Belgium - www.geo.ulg.ac.be2Royal Meteorological Institute, Belgium - www.meteo.be
November 18th, 20085th European Space Weather Week (Brussels, Belgium)
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We investigate NeQuick formulationusing collocated data.
foF2 yearly difference after validation
0
0,5
1
1,5
2
2,5
El Arenosillo Roquetes Dourbes
Station
foF
2 95
% le
vel [
MH
z]
a
1. Tools and Method
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We investigate NeQuick formulationusing collocated data.
1. Tools and Method
sTEC differences averaged by arc (Brussels – 2002)
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We investigate NeQuick formulationusing collocated data.
1. Tools and Method
Elevation filter (Brussels – March 28th, 2002)
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We investigate NeQuick formulationusing collocated data.
1. Tools and Method
Impact of elevation filter thanks to NeQuick simulations (Brussels – March 28th, 2002)
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The topside shape parameter k was unified in NeQuick 2.
3. Influence of k Unification
Monthly TEC mean (Roquetes - 2002)
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The topside shape parameter k was unified in NeQuick 2.
3. Influence of k Unification
Monthly TEC standard deviation (Roquetes - 2002)
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The improvement comes mainly from the topside modification.
3. Influence of k Unification
Daily TEC profile (El Arenosillo - February 12th, 2002)
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The improvement comes mainly from the topside modification.
3. Influence of k Unification
Ne profile (El Arenosillo - February 12th, 2002 – 10 UT)
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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