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STAFF/SA Ongoing (cross-)calibration activities

This document summarizes ongoing calibration activities for STAFF sensors discussed at the 10th Cross-Calibration meeting held at L'Observatoire de Paris from November 2-4, 2009. Key comparisons of ground and onboard sensitivities, noise levels, and turbulence spectra measurements in the solar wind are highlighted. A dedicated publication is planned, and the importance of these comparisons for future missions, such as Solar Orbiter, is emphasized. Preliminary findings show good agreement between STAFF and EFW regarding spectral shape and sensitivities, which will aid in future intercomparisons.

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STAFF/SA Ongoing (cross-)calibration activities

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  1. STAFF/SA Ongoing (cross-)calibration activities Y. De Conchy, O. Alexandrova, C. Lacombe, M. Maksimovic 10th CAA Cross-Calibration meeting L'Observatoire de Paris, Paris, 2-4 November 2009

  2. Comparisons of the ground/onboard sensitivies & noise levels for STAFF Important for the measurement of the turbulence spectra in the SW at the tipical electron scales

  3. A dedicated publication will be prepared & submitted for STAFF (NCW et al.) • Need to be done for EFW • Could be one topic of a futur Cluster workshop • This is an important activity in view of the future mission such as Solar Orbiter or Cross-Scale

  4. Comparisons between STAFF-SA and EFW Comparions of the Power Spectral Densities (PSD) at higher frequency : in burst mode Ex <F>~70 Hz a c b EFW sensitivity

  5. a b @ high signal : Always good agreement on the spectral shape, possible shift @ low signal : Both level & spectral shape different, EFW sensitivity flattening c

  6. Initial Comparisons between SW/WHI & WBD Note : Only 3 mins of data Extensive Comparisons between STAFF & WHISPER Work done by Yvonne de Conchy

  7. C1@ 2244 Hz Factor ~2 C1@ 2244 Hz Good agreement

  8. C1@ 2244 Hz C1@ 2828 Hz C1@ 3563 Hz C1 with increasing frequency Period 1 SA sensitivity level

  9. C1@ 2244 Hz C1@ 2828 Hz C1@ 3563 Hz C1 with increasing frequency Period 2

  10. C1@ 2424 Hz C2@ 2424 Hz C4@ 2424 Hz C3@ 2424 Hz All S/C Period 1

  11. C1@ 2424 Hz C2@ 2424 Hz C4@ 2424 Hz C3@ 2424 Hz All S/C Period 2 Period 2

  12. C1@ 3563 Hz C2@ 3563 Hz C4@ 3563 Hz C3@ 3563 Hz SA sensitivity level All S/C Period 1

  13. C1@ 3563 Hz C2@ 3563 Hz C4@ 3563 Hz C3@ 3563 Hz All S/C Period 2

  14. Conclusions • Ongoing comparisons of the ground/onboard magnetic sensitivies & noise levels for STAFF. • The overall agreement between SA & WHI is good • The SA sensitivity around 10-9 (mV2/m2/Hz) at high frequency. • Ondrej Santolik to perform intercomparisons between WBD & SA & WHISPER. • When and how to be satisfied with intercomparisons activities ?

  15. Wake effect in Magnetosphere (CC9-A1-7 to STAFF/EFW)

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