Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL MAGNETOMETER – STAR-IMAGER ALIGNMENT: APPARENT EULER ANGLE VARIATION DUE TO MAGNETOSPHERIC.

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Presentation transcript:

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL MAGNETOMETER – STAR-IMAGER ALIGNMENT: APPARENT EULER ANGLE VARIATION DUE TO MAGNETOSPHERIC CONTRIBUTIONS Nils Olsen 1, Karl Magnus Laundal 2, Chris Finlay 1, Lars Tøffner-Clausen 1 with help from the usual suspects 1 DTU Space 2 University in Bergen/Norway The Problem: “Time-changing Euler angles” Polar Field-Aligned Currents during “quiet” conditions and their low-latitude magnetic signature Impact on Euler angles Conclusions / Recommendations

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL Alignment of VFM Magnetometer and STR Star Imager VFM magnetometer measures magnetic vector B VFM in the VFM instrument frame STR measures attitude in the STR instrument frame Transforming B to Earth-fixed vector requires knowledge of the rotation VFM  STR where is the matrix describing the rotation of B from the VFM frame to the star tracker frame, and is the rotation matrix from the STR to the NEC coordinate frame

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL The VFM  STR rotation matrix R 3 R 3 is determined in-flight by comparing the observed vector B VFM,obs with a model vector B VFM,mod that has been rotated from B NEC,mod  B VFM,mod R 3 is often co-estimated with a magnetic field model B NEC,mod

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL Apparent time changes of Euler angles 36”

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL The VFM  STR rotation matrix R 3 R 3 is determined in-flight by comparing the observed vector B VFM,obs with a model vector B VFM,mod that has been rotated from B NEC,mod  B VFM,mod R 3 is often co-estimated with a magnetic field model B NEC,mod Any magnetic field contribution that is not properly described by the field model may contribute to erroneous determination of R 3 (i.e. of the Euler angles)

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL The Evolution of Simplification … Olsen and Stolle, 2012

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL [nA/m 2 ] Presentation at QWG Paris, Sep 2015 Error in roll angle a due to in-situ currents Magnetic field signature observed by a polar-orbiting satellite around local midnight can be equally well explained by VFM-STR misalignment of 20” in roll angle  Magnetospheric field in MLT frame In-situ electric current density Large-scale in-situ currents of  1 nA/m 2 cause apparent Euler-angle mismatch of 20” (Lühr et al., GRL 2015)

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL Now: Error angle mismatch due to magnetic field produced by distant Field-Aligned Currents (FACs)

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL Necessary Conditions for Spherical Harmonic Analysis of B Assumption: data are taken in current-free region (  B = 0 in whole sampling region) No spherical harmonic potential expansion possible if  B  0 in some region Poloidal-toroidal decomposition is always possible:

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL Magnetic signature from polar FACs in non-polar regions Vector data B at non-polar latitudes (contribute to Euler angles) Scalar data F at polar latitudes (do not contribute to Euler angles)

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL Polar FACs during ”quiet” conditions 2 May 2014, Kp = 0 o – 1 - Cat-2 product SW_OPER_FACATMS_2F_ T000000_ T235959_0201.DBL

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL Polar FACs during ”quiet” conditions 2 May 2014, Kp = 0 o – 1 - Cat-2 product SW_OPER_FACATMS_2F_ T000000_ T235959_0201.DBL Northern Hemisphere Southern Hemisphere

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL Polar FACs during ”quiet” conditions 26 Nov – 13 Dec 2013, Swarm A Northern Hemisphere Southern Hemisphere

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL Polar FACs during ”quiet” conditions Nov 2013 – March 2016, Swarm A Northern Hemisphere Southern Hemisphere Mean values, from CAT-2 FAC Standard deviation, from CAT-2 FAC

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL Polar FACs during ”quiet” conditions Nov 2013 – March 2016, Swarm A Northern Hemisphere Southern Hemisphere Determined using poloidal-toroidal decomposition of SIFMplus vector residuals

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL Polar FACs during ”quiet” conditions Nov 2013 – March 2016, Swarm A Northern Hemisphere Southern Hemisphere Mean values, from CAT-2 FAC

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL Summary: Polar FACs Field-aligned currents (FACs) are always present at polar latitudes (> 60 o magnetic latitude) They connect ionosphere and magnetosphere, along field-lines of Earth’s main field (mainly dipolar) Amplitudes are very varying, up to several 1000 nA/m 2 even during ”quiet” conditions (as used for geomagnetic field modeling and Euler angle estimation) 250 nA/m 2 is a typical order of magnitude mean value which we use in following

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL Low-latitude magnetic field contribution due to polar FACs Construction of 3D current system J FACs at top of ionosphere … closing currents in ionosphere (110 km altitude) … current continuation along field lines … … and possibly closing currents in magnetosphere. Determination of magnetic field vector B due to this 3D current system using poloidal-toroidal decomposition of J and B (Olsen and Engels, 1998) This magnetic contribution is not considered in any existing field model… … and may therefore have impact on determined Euler angles

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL Test with synthetic data Swarm Alpha time and positions from SIFMplus data selection Synthetic values of B core + B FAC Rotated NEC  VFM frame using CCDB Euler angles (static) Estimation of field model + Euler angles (in bins of 10 days) similar to what has been done with real data for SIFMplus (but only Swarm Alpha data, and no gradient data) Excellent Euler-angle recovery if B = B core (no B FAC ) (< 0.5” difference to CCDB in all 10-day bins)

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL Test with synthetic data Correct order of magnitude (250 nA/m 2 yields up to 60” peak-to-peak), similar MLT dependence as observed, although different phase.

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL Other possible R1/2 FAC models The used FAC model (based on SIFMplus residuals) reflect annual mean, i.e. North-South symmetry Current closure in magnetospheric equatorial plane But there probably exist some FACs connecting Northern and Southern polar regions (North-South asymmetry)

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL Two simplistic elementary current systems Symmetric / asymmetric R-1/2 currents of about 250 nA/m 2 (much weaker than measured instantaneous currents) can explain Euler angle variation

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL Conclusions Ionospheric/magnetospheric currents are responsible for apparent change of Euler angles No ”Mysterious misalignments” Polar FACs current densities of 250 nA/m 2 can explain the observed LT variations This current densities are much lower (factor 5 to 10) then observed FACs, and thus small variations or persistent structures in FACs will cause the observed apparent Euler angle variation No indication for true time-changing Euler angles constant (static) values should be used for L1b processing

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL Much smaller time-variation in Euler order frame The two representations describe exactly the same rotation!

Magnetic Measurement Expert Group10-11 March 2016Warsaw / PL Euler Vector Representation Direction of vector yields rotation axis Amplitude proportional to rotation around axis (some similarity to first 3 elements of quaternions)