Journal cover Journal topic
Geoscientific Instrumentation, Methods and Data Systems An interactive open-access journal of the European Geosciences Union
doi:10.5194/gi-2017-8
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
23 Feb 2017
Review status
This discussion paper is under review for the journal Geoscientific Instrumentation, Methods and Data Systems (GI).
Stability analysis of geomagnetic baseline data obtained at Cheongyang observatory in Korea
Shakirah M. Amran1,2,3, Wan-Seop Kim1,2, Heh Ree Cho1, and Po Gyu Park1,2 1Korea Research Institute of Standards and Science, 267 Gajeong-ro, Yuseong-gu, Daejeon 34113, Rep. of Korea
2University of Science and Technology, 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Rep. of Korea
3National Metrology Institute of Malaysia, Lot PT 4803 Bdr Baru Salak Tinggi, 43900 Sepang, Selangor, Malaysia
Abstract. The stabillity of baselines produced by Cheongyang (CYG) observatory from a period of 2014 to 2016 is analysed. Step height of higher than 5 nT were found in H and Z components in 2014 and 2015 due to magnetic noise in the absolute measurement hut. In addition, a periodic modulation behaviour observed in the H and Z baseline curves was related to temperature variation of about 20 °C in the fluxgate magnetometer hut. The quality of the baselines was improved by correcting the discontinuity in the H and Z baselines. Moreover, the stability of the both baselines was also improved by about 6 nT/year from 10 nT/year by performing the temperature effect correction.

Citation: Amran, S. M., Kim, W.-S., Cho, H. R., and Park, P. G.: Stability analysis of geomagnetic baseline data obtained at Cheongyang observatory in Korea, Geosci. Instrum. Method. Data Syst. Discuss., doi:10.5194/gi-2017-8, in review, 2017.
Shakirah M. Amran et al.
Shakirah M. Amran et al.
Shakirah M. Amran et al.

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Short summary
In this work, we analysed the Cheongyang geomagnetic baseline data from 2014 to 2016. We observed a step of more than 5 nT in H and Z baseline on 2014 and 2015 due to artificial magnetic noise in the absolute hut. In addition, the baseline shows a yearly drift of more than 10 nT due to temperature variations in the fluxgate magnetometer hut. The quality of the baselines was improved by correcting the discontinuity in the H and Z baselines and performing the temperature effect correction.
In this work, we analysed the Cheongyang geomagnetic baseline data from 2014 to 2016. We...
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