1 SOVAP - BOS (Bolometric Oscillation Sensor) DAVOS Scientific meeting A1: calibration A2: validation A3: Science products determination A4: Routine and non-routine tasks A5: Scientific community interfaces

2 Royal Observatory of Belgium Concept Repartition of flows A E1E1 E2E2 C1C1 C2C2 Radiative Conductive

3Coatings Flat absorber : black painting (α s = 0.98, ε = 0.85) Solar reflector : White silicate painting (α s = 0.13, ε = 0.90) White Painting Black Painting Absorbing surface = 21 % of total surface Temperature of balance = 25°C :

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B-USOC juin 2009 Theoretical transfer function Picard/BOS electronics

6 #include #define Kmod // #define beta 4143 // #define T // #define R #define R #define R #define R #define R #define R #define R void BOS_V2T(double V1,double V2,double *T_OUT); int main(int argc, char *argv[]) { double T12_OUT[2],*T12_ptr; T12_ptr=&T12_OUT[0]; BOS_V2T(2,0,T12_ptr); printf("%lf\r\n",T12_OUT[0]); printf("%lf\r\n",T12_OUT[1]); system("PAUSE"); return 0; } void BOS_V2T(double V1,double V2,double *T_OUT) { double G11,G12,Vamp11,Vamp12,Vpp1,Vpm1,Rt1,T1; double G21,G22,Vamp21,Vamp22,Vpp2,Vpm2,Rt2,T2; double Valim; Valim = 8; //********************************************* Vamp12=V1; //********************************************* G11=1; G12= /R13; Vamp11=Vamp12/(Kmod*G12); Vpp1=Valim/(1+R19/R18); Vpm1=(G11*Vpp1-Vamp11)/G11; Rt1=Vpm1*R15/(Valim-Vpm1); T1=beta*T0/(T0*log(Rt1/R0)+beta); //********************************************* Vamp22=V2; //********************************************* G21=1; G22= /R23; Vamp21=Vamp22/(Kmod*G22); Vpm2=Vpm1; Vpp2=(Vamp21+Vpm2*G21)/G21; Rt2=Vpp2*R29/(Valim-Vpm2); T2=beta*T0/(T0*log(Rt2/R0)+beta); //********************************************* *T_OUT++=T1; *T_OUT =T2; } Theoretical transfer function Picard/BOS electronics

7 SOVAP - BOS (Bolometric Oscillation Sensor) A1: calibration A2: validation A3: Science products determination A4: Routine and non-routine tasks A5: Scientific community interfaces

8 Royal Observatory of Belgium Noise level with a 50 sec low pass filter, is about 1/10Hz Corresponding to a dynamic range of /1 1% of modulation = 1000 lux = 500Hz

9 Ramp and sin for scale factor T1 and T1-T2 Figure 4: Ramp and sin for scale factor Figure 5: T1 and T1-T2

10 Royal Observatory of Belgium Experiments

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12 Flat Field (10sec) cycle On/Off

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Star pointings October 6 & November 9, 2010

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32 SOVAP - BOS (Bolometric Oscillation Sensor) A1: calibration A2: validation A3: Science products determination A4: Routine and non-routine tasks A5: Scientific community interfaces

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35 The projection of PICARD satellite orbit. Here, we plotted the position of PICARD from 17:33 to 21:25 on July 11, This period is overlap with the solar eclipse. Red dashed line is from 17:33 to 18:41; Blue dashed line is from 18:41 to 20:12; Black dashed line is from 20:12 to 21:15. Two dark brown line marks the north and south limits of the greatest eclipse.

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46 38 days records calibrated records, the linear trend has been removed.

47 Amplitude Fourier Spectrum of T1 and T2 computed using 38 days’ records 3 Minutes 99 Minutes

48 38 days records calibrated records, the linear trend has been removed. The Sub panel plotted 240 minutes data.

Three hours T1 measurements plotted on the map. The geocentric position was computed with the predicted orbit using WGS84

50 Three hours T2 measurements plotted on the map. The geocentric position was computed with the predicted orbit using WGS84

51 Thank you