Geomagnetic observations in Mongolia
Geomagnetic department of Institute of Astronomy and Geophysics has four magnetic observations. These are Ulaanbaatar (MAG-ULN), Tawantolgoi (MAG-MTT), Khovd (MAG-HVD) and Dalanzadgad (DZD) observations.
ULN magnetic observation
Ulaanbaatar magnetic observation is located in Khureltogoot, which is close to the Ulaanbaatar city, directed south east, approximately 20 kilometers distanced and geodetical coordinate is φ=49o51.9 , λ=107o0 03.0.
In this observation continuous recording three components (H,D,Z) of geomagnetic, total intensity using torsion and proton precession magnetometers. And we are measuring absolute magnetic value using quartsion magnetometer (figure1) one
time each week.
Figure 1: Magnetometers, right hand is proton precession magnetometer which is made in Poland, mark is PMP-5, left hand image is quartion magnetometer.
MTT magnetic observation
Tawantolgoi magnetic observation has developed since 2013. Because ULN magnetic observation is insufficient worked due close to the UB in which area lot of power line and train. So data is noisy for the high quality instruments. Thus we need new geomagnetic observation for the new instruments. MTT observation is located by Tawantolgoi which is directed west from UB, approximately 60 kilometers and geodetical coordinate is φ= 47053.1357, λ= 106020.4941 (Figure 2).
Figure 2: MTT magnetic observation
Area of Geomagntetic observation should be normal distributed and not high changed, thus we have measured total intensity of magnetic of earth in Tawantolgoi area. In this measurement field was 100x100m and we made isodynamic map in this area (Figure 3). Our measurement result was looks suitable for the build the observation.
Figure 3: Geomagnetic isodynamic map of field of MTT
And we have estimated power spectrum of Lemi-25 before from install the instrument (Figure 4).
Figure 4: Power Spectrum of Lemi-25
In this observation, we are recording three components of geomagnetic, total intensity using Lemi-25 and POS-1 and in absolute measurement using Lemi-204 magnetometer. Figure 5: Instuments of MTT
