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Comparison of STAFF-SA and WBD

Comparison of STAFF-SA and WBD. Magnetic components of intense whistler-mode chorus. Prepared by Ondrej Santolik. 14th CAA Cross-Calibration meeting , York, 5-7 Oct 2011. Context.

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Comparison of STAFF-SA and WBD

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  1. Comparison of STAFF-SA and WBD Magnetic components of intense whistler-mode chorus Prepared by Ondrej Santolik 14th CAA Cross-Calibration meeting, York, 5-7 Oct 2011

  2. Context • No comparisons between STAFF SA and WBD using magnetic component had ever been presented. An action was pending: • CC8 – AI-45 STAFF :To carry out a cross-calibration study between STAFF-SA and WBD as they appears to be not in good agreement with WBD above 700 Hz while WBD/Whisper shows moderately good agreement. O. Santolik was in charge of this action, to be done during the summer.

  3. Power spectrogram of the electric field fluctuations. (WBD)‏ Power spectrogram of the magnetic field fluctuations. (STAFF-SA) Parallel component of the Poynting vector normalized by its standard deviation. (STAFF-SA)‏ Electromagnetic planarity. (STAFF-SA)‏ \// Bo SOURCE // Bo

  4. ZOOM on SOURCE REGION WBD • Selected intervals of WBD magnetic-filed measurements 08:44:55- 8:53:48, • compared with the STAFF-SA onboard analyzed data • WBD • BY component in the spinning spacecraft system (10s ~every 50s when Whisper is active) • FFT of time series corresponding to STAFF-SA 4-s analysis intervals • Power is averaged in frequency intervals of 27 STAFF-SA frequency channels • STAFF-SA • despun sunward component, analyzed onboard

  5. WBD and STAFF-SA data in 56 time intervals of 4 s and 27 freq. steps

  6. STAFF-SA Band A But low power in band A

  7. STAFF-SA Band B

  8. STAFF-SA Band C Best Better, but intense waves

  9. A B C Low waves Strong waves Noise

  10. Results • Large differences of obtained PSD at low frequencies < 60 Hz, probably linked to the WBD high-pass filters. -> low signal, and no same sensitivity • Median power ratio for f > 60 Hz is 1-5. STAFF-SA shows higher levels than WBD. (bands B & C) • Large variations (~one order of magnitude) • Very intense waves with PSD> 10-7 nT 2/Hz give similar values for STAFF-SA and WBD. • Proper comparison is difficult, WBD samples one single spinning component, STAFF-SA gives onboard despun data.

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