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Published byMarlon Taff Modified over 2 years ago

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Atmospheric polarisation measured by POLDER Polarisation: Stokes vectors, direction, etc. POLDER Results of analysis of POLDER polarisation data Conclusion / Relevance to SCIAMACHY 28 August, 2003

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Polarisation Atmospheric light: Stokes vector {I, Q, U, V} Q = I 0° – I 90° U = I 45° – I 135° Q = P I cos 2 U = P I sin 2 P = degree of polarisation = direction of polarisation V = 0 ; Q and U describe the linear part of polarisation

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POLDER (ADEOS-I) CCD detector matrix. Bandfilter carousel. Resolution 6 x 7 km 2. Polarisation at 443, 670 and 865 nm. I, Q, and U.

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Direction of polarisation Comparison between POLDER and single scattering theory: = ½ atan U/Q

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Conclusions Direction of polarisation ~ single scattering value. No need to measure it (SCIAMACHY). It’s BETTER not to use a measured value (SCIAMACHY). Spread for a large part determined by measurement errors in POLDER data, especially at larger wavelengths.

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