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20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 1 5 Ways of Measuring DC Electric Field: Who Does it Correctly?

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Presentation on theme: "20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 1 5 Ways of Measuring DC Electric Field: Who Does it Correctly?"— Presentation transcript:

1 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 1 5 Ways of Measuring DC Electric Field: Who Does it Correctly?

2 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 2 CLUSTER Instruments for DC E-fields, 1  DC Electric Field and ExB Drift Velocity are now available in five datasets, which allows to have a good understanding of the motion of charges at critical regions  EFW = Double Probe Antenna  Principle: potential difference of two conducting spheres separated by 88 meters  Issues: o conducting and photo-emitting spacecraft modifies electrostatic environment around the spacecraft    two sensors are not in the same environment: offsets particularly in solar direction Wakes: artificial strong E-fields  EDI = Electron Drift Instrument  Principle: Electron gun emitting 0.5 or 1 keV electrons perpendicular to B-field; emission is modulated at a few kHz frequency  Issues: o when magnetic field is time-varying, it is difficult to find the perpendicular direction o Spatially-varying magnetic field may cause that electrons do not return to the spacecraft, or signal is weak and dispersed

3 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 3 CLUSTER Instruments for DC E-fields, 2  PEACE: electron velocity moment (ground)  Principle: 3D electron spectrometer, measuring electron fluxes with 12 anodes during one spin; electron velocity moment is calculated on ground  Issues: o Due to the limited TM bandwidth, data are highly compressed onboard o Full 4 sec of data are needed (time-aliasing effects) o Multiple electron populations and limited energy resolution/coverage o Satellite photoelectrons o Variation of detector efficiencies  New dataset: C*_CP_PEA_MOMENTS_INERT  Variables o Data_Velocity_GSE_inert Data_Velocity_ISR2_inert o Data_PerpVelocity_GSE_inert Data_PerpVelocity_ISR2_inert o Data_ParVelocity_GSE_inert Data_ParVelocity_ISR2_inert o Data_Efield_GSE_inert Data_Efield _ISR2_inert  PEA_MOMENTS: Data are given in spacecraft frame (GSE)  PEA_MOMENTS_INERT: data are given in Earth’s frame (GSE and ISR2), velocity components parallel and perpendicular to B-field separated These variables can be compared with EDI and EFW

4 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 4 CLUSTER Instruments for DC E-fields, 3  CIS ion spectrometers  HIA: ion velocity moment (onboard) and CODIF: H+ velocity moment (ground)  Principle: 3D ion spectrometer, measuring ion fluxes with 12 anodes during one spin  Issues: o Full 4 sec of data are needed (time-aliasing effects) o Multiple ion populations and limited energy resolution/coverage o Variation of detector efficiencies  New datasets:  C*_CP_CIS-CODIF_HS_H1_MOMENTS_ INERT  C*_CP_CIS-CODIF_LS_H1_MOMENTS_ INERT  C*_CP_CIS-HIA_ONBOARD_MOMENTS_INERT  Variables o Data_Velocity_GSE_inert Data_Velocity_ISR2_inert o Data_PerpVelocity_GSE_inert Data_PerpVelocity_ISR2_inert o Data_ParVelocity_GSE_inert Data_ParVelocity_ISR2_inert o Data_Efield_GSE_inert Data_Efield _ISR2_inert  MOMENTS: Data are given in spacecraft frame (GSE and ISR2)  MOMENTS_INERT: data are given in Earth’s frame (GSE and ISR2), velocity components parallel and perpendicular to B-field separated

5 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 5 Comparison Plots for DC E-field and ExB Drift Velocity  Hourly comparison created between two experiments if there are 30+ simultaneous measurements (no interpolation is done); simultaneous means the measurements are taken within ±2 sec  Changes:  for PEACE comparisons: only 10+ points  for the others, 20+ points required (TBC)

6 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 6 PLASMA SHEET EVENTS

7 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 7 7 Sep 2001 17-18 UT

8 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 8 PEACE vs CODIF: DC E-field

9 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 9 PEACE vs CODIF: Drift Velocity

10 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 10 PEACE vs HIA: DC E-field

11 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 11 PEACE vs HIA: Drift Velocity

12 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 12 EFW vs HIA: DC E-field

13 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 13 EFW vs HIA: Drift Velocity

14 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 14 PEACE vs CODIF: DC E-field

15 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 15 7 SEP 2001 19-20 UT

16 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 16 PEACE vs CODIF: Drift Velocity

17 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 17 PEACE vs HIA: DC E-field

18 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 18 PEACE vs HIA: Drift Velocity

19 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 19 EFW vs HIA: DC E-field

20 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 20 EFW vs HIA: Drift Velocity

21 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 21 3 Aug 2001, 15-16 UT

22 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 22 PEACE vs CODIF: DC E-field

23 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 23 PEACE vs CODIF: Drift Velocity

24 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 24 PEACE vs HIA: DC E-field

25 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 25 PEACE vs HIA: Drift Velocity

26 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 26 EFW vs HIA: DC E-field

27 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 27 EFW vs HIA: Drift Velocity

28 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 28 EDI vs COD: DC E-field

29 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 29 EDI vs COD: Drift Velocity

30 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 30 3 Aug 2001, 17-18 UT

31 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 31 PEACE vs CODIF: DC E-field

32 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 32 PEACE vs CODIF: Drift Velocity

33 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 33 PEACE vs HIA: DC E-field

34 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 34 PEACE vs HIA: Drift Velocity

35 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 35 EFW vs HIA: DC E-field

36 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 36 EFW vs HIA: Drift Velocity

37 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 37 EFW vs PEA: DC E-field

38 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 38 EFW vs PEA: Drift Velocity

39 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 39 PEACE vs EDI: DC E-field

40 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 40 PEACE vs EDI: Drift Velocity

41 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 41 EDI vs HIA: DC E-field

42 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 42 EDI vs HIA: Drift Velocity

43 20 th CAA Cross-Calibration Workshop MPS, Göttingen, Germany 15-17 Oct 2014 43 More comparisons for the plasma sheet and magnetopause in Annex 16

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