STUDIES OF GEOMAGNETIC SECULAR VARIATIONS AT OBSERVATORIES AND REPEAT STATIONS USING FLUXGATE THEODOLITES
A.V. Ladynin, A.F. Pavlov*, A.A. Popova, N.N. Semakov, and S.Yu. Khomutov*
Novosibirsk State University, 2 ul. Pirogova, Novosibirsk, 630090, Russia
* Geophysical Survey, Siberian Branch of the RAS,
3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Geomagnetic field, secular variation, magnetic observatory, repeat station, fluxgate theodolite, declination, inclination
Pages: 800-811
Abstract
Satellite measurements cannot provide the appropriate monitoring of space and time geomagnetic secular variations as data from magnetic observatories are not properly taken into account. With the rare regional network of magnetic observatories in Siberia and the Russian Far East, it is essential to resume systematic monitoring of the geomagnetic field at repeat stations (RS). We suggest a method of vector magnetic measurements at repeat stations using fluxgate theodolite-proton magnetometer sets. The method was developed on the basis of analysis of uncertainty in vector magnetic measurements and imitation modeling of data from five observatories around Novosibirsk. We chose an efficient way for reducing the RS diurnal values of field components to their annual values by interpolation of differences between these values at the neighbor observatories. The new method can be used for resuming geomagnetic monitoring at repeat stations.
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