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- W402487071 abstract "Introduction Geomagnetic absolute observation with a fluxgate theodolite (FT) magnetometer at a low geomagnetic latitude site with a shalow magnetic inclination requires the use of a prism in order to read the scale due to the structure of the magnetometer. In areas around the equator with even shalower inclinations, it would be impossible to read the scale even with a prism. In such a situation, there is no other choice but to employ extraordinary methods of observation (Owada, 1998). The use of a prism for geomagnetic observation requires rotating the prism every time the magnetometer is turned around. Thereby, it wil force complicated observation procedures, and induce puting the scale reader out of focus. That causes errors in scale reading as a result of refocusing the scale reader. Even when the use of a prism is not required, geomagnetic observation often makes it necessary to read the scale in an unnatural position, thereby causing paralax errors. In order to resolve these problems, we developed a new method of observation. The new method uses an ofset control function of a fluxgate magnetometer (FM) mounted in an FT magnetometer. Adequate ofset to subtract from the natural geomagnetic field could make easier to conduct observation in the direction in which the output of the FM becomes zero. In this article, we report on the results of observation conducted by using this method. 2. Method of observation The FM mounted in the FT magnetometer used for observation in our research was a singleaxis solenoid sensor manufactured either by Bartington Instruments or by Shimadzu Corporation. Of these sensors, the MAG-01H manufactured by Bartington Instruments has an ofset control for up to ±90000 nT in 10000 nT steps. This FM makes it possible to continuously observe changes in one of the three geomagnetic components. Although absolute observation is normaly conducted with the intensity of the ofset to zero, we applied ofsets with intensities of 10000 nT,20000 nT and40000 nT and calculated instrumental errors in measurements in comparison with the DI-72, the standard angle measuring instrument of Kakioka Magnetic Observatory, and compared these instrumental errors with errors obtained without any ofset. Observation procedures are folowing:" @default.
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- W402487071 date "2000-01-01" @default.
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- W402487071 title "New Observation Method Using a Fluxgate Theodolite Magnetometer" @default.
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