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A prototype service to monitor the ionospheric scintillations

ROB. 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. PARTNERSHIP.

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A prototype service to monitor the ionospheric scintillations

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  1. ROB 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 PARTNERSHIP Disturbances in the ionosphere especially in the equatorial region are due to strong irregularities on electron concentration in the E and F regions. Typical turbulences associated with the scintillations of signals propagating in the plasma medium have an extension of a few hundred meters and a characteristic period of the ions recombination processes from below 0.01s up to a few seconds. The phenomena may last several hours with major intensity after sunset (along the Equator). It produces strong and rapid amplitude and phase fluctuations of a GPS propagating signal. PROCESSING CALIBRATION SERVICE PROTOTYPE GPS Permanent network perturbations analyses that lead to empirical scintillation index : - L2 signal tracking losses & cycle slips - Phase fluctuations - Signal-to-noise 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 Ionospheric Scintillation Monitor (ISM) collocated with an IGS station. Some comparisons have been done with an ESA ISM at Douala (Cameroon). Kourou will soon be equiped with an ISM for this purpose. • YELLOWKNIFE: RINEX amplitude data (IGS, 1s samples) ——— S1 ——— S2 (P = 1 min average) multipaths Ionosphericeffect http://scintillations.cls.fr/ PRODUCTS KOUROU – seasonal/diurnal variations 7 Nov. 2004 - Magnetic storm monitoring Hourly maps - 1 s GPS data (60 sites) 5 & 8 Nov. 2004 - Magnetic storm monitoring Daily maps - 30 s GPS data (250 sites) 2 permanent receivers (ESA/ESOC) at KOUROU: ASHTECH UZ-12 (kour) JPS LEGACY (kou1) Max activity expected during the equinox 1-30 March 2004 (Kp max=6) Min activity expected during the solstices1-30 June 2004 (Kp max=5) 00h TU Kp= 1 Kp= 2 ASHTECH UZ-12 (kour, 30 s samples) March 2004 21h TU Kp= 6 June 2004 Kp= 9 JPS LEGACY kou1, 30 s samples) Scintillation intensity distribution March 2004: about 3000 events (>0.25) June 2004: about 100 events (>0.25) First European Space Weather Week, Noordwijk, 29th Nov. - 3 Dec. 2004

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