A prototype service to monitor the ionospheric scintillations J.J. Valette, P. Yaya, B. Nhun Fat (CLS) & P. Lassudrie-Duchesne, R. Fleury (ENSTB)

ESA Pilot Project for Space Weather Applications

PROCESSINGPROCESSINGPROCESSINGPROCESSING

PARTNERSHIPPARTNERSHIPPARTNERSHIPPARTNERSHIP

SERVICE PROTOTYPESERVICE PROTOTYPESERVICE PROTOTYPESERVICE PROTOTYPE

CALIBRATIONCALIBRATIONCALIBRATIONCALIBRATION

KOUROU – seasonal/diurnal variationsKOUROU – seasonal/diurnal variationsKOUROU – seasonal/diurnal variationsKOUROU – seasonal/diurnal variations

• YELLOWKNIFE: RINEX amplitude data (IGS, 1s samples)

——— S1 ——— S2

Ionosphericeffect

multipaths

2 24 /S P P P

(P = 1 min average)

7 Nov. 2004 - 7 Nov. 2004 - Magnetic storm monitoringMagnetic storm monitoring

Hourly mapsHourly maps - 1 s GPS data (60 sites) - 1 s GPS data (60 sites)

Max activity expected during the equinoxMax activity expected during the equinox1-30 March 2004 (Kp max=6)1-30 March 2004 (Kp max=6)

Min activity expected during the solsticesMin activity expected during the solstices1-30 June 2004 (Kp max=5)1-30 June 2004 (Kp max=5)

GPS Permanent network perturbations analyses that lead to empirical scintillation index :GPS Permanent network perturbations analyses that lead to empirical scintillation index :- L2 signal tracking losses & cycle slips- L2 signal tracking losses & cycle slips- Phase fluctuations- Phase fluctuations- Signal-to-noise- Signal-to-noise

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medium (0.25-0.5) strong (0.5-0.75) severe (>0.75)

ASHTECH UZ-12

JPS LEGACY

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medium (0.25-0.5) strong (0.5-0.75) severe (>0.75)

2 permanent receivers (ESA/ESOC) at KOUROU:2 permanent receivers (ESA/ESOC) at KOUROU:ASHTECH UZ-12 (kour)ASHTECH UZ-12 (kour)JPS LEGACY (kou1)JPS LEGACY (kou1)

Scintillation intensity distributionScintillation intensity distributionMarch 2004: about 3000 events (>0.25)March 2004: about 3000 events (>0.25)

June 2004: about 100 events (>0.25)June 2004: about 100 events (>0.25)

ASHTECH UZ-12 ASHTECH UZ-12 (kour, 30 s samples)(kour, 30 s samples)

JPS LEGACY JPS LEGACY kou1, 30 s samples)kou1, 30 s samples)

March 2004March 2004

June 2004June 2004

S1 and S2 amplitudes or phases RINEX data available from the IGS network S1 and S2 amplitudes or phases RINEX data available from the IGS network need to be calibrated. The proposed calibration scheme involves the use of a need to be calibrated. The proposed calibration scheme involves the use of a Ionospheric Scintillation Monitor (ISM) collocated with an IGS station. Ionospheric Scintillation Monitor (ISM) collocated with an IGS station. Some comparisons have been done with an ESA ISM at Douala (Cameroon). Some comparisons have been done with an ESA ISM at Douala (Cameroon). Kourou will soon be equiped with an ISM for this purpose.Kourou will soon be equiped with an ISM for this purpose.

ROB

Disturbances in the ionosphere especially in the equatorial region are Disturbances in the ionosphere especially in the equatorial region are due to strong irregularities on electron concentration in the E and F due to strong irregularities on electron concentration in the E and F regions. Typical turbulences associated with the scintillations of regions. Typical turbulences associated with the scintillations of signals propagating in the plasma medium have an extension of a few signals propagating in the plasma medium have an extension of a few hundred meters and a characteristic period of the ions recombination hundred meters and a characteristic period of the ions recombination processes from below 0.01s up to a few seconds. The phenomena may processes from below 0.01s up to a few seconds. The phenomena may last several hours with major intensity after sunset (along the last several hours with major intensity after sunset (along the Equator). It produces strong and rapid amplitude and phase Equator). It produces strong and rapid amplitude and phase fluctuations of a GPS propagating signal.fluctuations of a GPS propagating signal.

00h TU00h TUKp= 1Kp= 1

21h TU21h TUKp= 6Kp= 6

Kp= 2Kp= 2

Kp= 9Kp= 9

5 & 8 Nov. 2004 - 5 & 8 Nov. 2004 - Magnetic storm monitoringMagnetic storm monitoring

Daily mapsDaily maps - 30 s GPS data (250 sites) - 30 s GPS data (250 sites)

First European Space Weather Week,First European Space Weather Week, Noordwijk, 29th Nov. - 3 Dec. 2004 Noordwijk, 29th Nov. - 3 Dec. 2004

PRODUCTSPRODUCTSPRODUCTSPRODUCTS

http://scintillations.cls.fr/http://scintillations.cls.fr/