Stability and Accuracy of Standard Magnetic Observation by KASMMER System
Sano, Y.
Abstract
Instrumental studies of the standard magnetic observation by KASMMER system during the period from Sept. 1973 to Apr. 1975 are described mainly discussing stability of optical pumping magnetometers of the system and accuracy of absolute calibration measurement.
The total force optical pumping magnetometer which has no bias field shows the most excellent stability of about 0.5γ/year. For the other three component magnetometers which have proper bias field, in average is found a good stability of 1.5γ-2.0γ/year.
Examining fluctuations of individual measured values of calibration magnetometer DI-72, the standard deviation of single value error is estimated at 0.0328' for D-component and 0.0200' for I-component. This leads to the accurate calibration better than 0.1γor 0.01' for one time calibration measurement of 32 values.
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