[SCG71-P15] Continuous 3-component geomagnetic observation in Yona, Okinawa Prefecture at the research and education facility of University of the Ryukyus
Keywords:on-land continuous geomagnetic measurement, calibration of surface-ship geomagnetic data
The authors are showing some results of a trial analysis of the on-land geomagnetic observation in 2011. The geomagnetic total force intensity shows a variation of daily variation with 30nT in amplitude, although more than 100nT change takes place corresponding the solar activity due to the occurrence of sunspots (based on the National Astronomical Observatory observation). The result of the spectrum analysis of the data in 2011 shows the peaks of at, 15, 5, 2, 1.3, and 1 day periods.
Geographic Survey Institute of Japan (GSI) is also collecting 3-component geomagnetic data in Okinawa Prefecture, at 26.630 degrees north, 128.127 degrees east, 140m altitude in Higashi Village. Both NICT and GSI data shows positive correlation approximately. However, the NICT values are about 120nT smaller and the change rate shows by about 1.3 times larger compared with GSI values.