In order to calibrate the STEREO Magnetometer, a series of operations is applied to the recorded raw data (counts).  The series of operations are done by making calculations based on the matrice or vectors that represent the adjustments need to be applied.

Currently, the offset and scale factor values are keep in a spreadsheet at UCLA's internal web page.

The user may get the values from that spreadsheet and make the adjustment matrix or vector by running a shell script.

The shell script will generate the offset.dat (offset calibration) and scale.dat (k values, scale factor calibration).

STEREO telemetry packet type X270's (Beacon packet) offset calibration depends on the offset.dat file.  If the offset.dat file exists, the system will use the values in that file, otherwise, the system will use vector_zero.dat instead.  Therefore, the bottom line is, it is up to the operator to plug in the offset values for this type of compensations.

STEREO telemetry packet type X208, and X209's always skip offset calibration, which results in an uncorrected (in terms of offset calibration) dataset.

UCLA's scientists derive the offset values based on the uncorrected dataset and make the corrected dataset by applying the offsets to the uncorrected dataset, and post the dataset in the web site.  The offset values are also posted in the internal web page so that the interested community may access to this piece of information.  One particular application for this piece of information is to apply the offsets to the beacon telemetry packets.

All other calibrations are represent with .dat files and may be modified by the operator of the MAG software, after the characteristics of the STEREO Magnetometer are realized.

Calibration files
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rot.dat
freq.dat
intcal.dat
scale_A_r1.dat
scale_A_r0.dat
scale_B_r1.dat
scale_B_r0.dat
offset_A_r0.dat
offset_A_r1.dat
offset_B_r0.dat
offset_B_r1.dat
orth_A_r0.dat
orth_A_r1.dat
orth_B_r0.dat
orth_B_r1.dat
vector_zero.dat - defaulted
matrix_zero.dat - defaulted