Stability analysis of geomagnetic baseline data obtained at Cheongyang observatory in Korea

Shakirah M. Amran, Wan-Seop Kim, Heh Ree Cho, Po Gyu Park
2017 Geoscientific Instrumentation, Methods and Data Systems  
<p><strong>Abstract.</strong> The stability of baselines produced by Cheongyang (CYG) observatory from the period of 2014 to 2016 is analysed. Step heights of higher than 5<span class="thinspace"></span>nT were found in <i>H</i> and <i>Z</i> components in 2014 and 2015 due to magnetic noise in the absolute-measurement hut. In addition, a periodic modulation behaviour observed in the <i>H</i> and <i>Z</i> baseline curves was related to annual temperature variation of about 20<span
more » ... span class="thinspace"></span>°C in the fluxgate magnetometer hut. Improvement in data quality was evidenced by a small dispersion between successive measurements from June 2015 to the end of 2016. Moreover, the baseline was also improved by correcting the discontinuity in the <i>H</i> and <i>Z</i> baselines.</p>
doi:10.5194/gi-6-231-2017 fatcat:b4ag4a7dq5e2jnph462n3jhs34