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BOH magnetometer was installed at Mt. Bohyun in 2007 and has provided continuous dataset for 3-axis geomagnetic field\udover the South Korea. We have calculated real-time K-index based on BOH magnetic field data using well-known FMI method.\udLocal K-index is calculated eight times a day, per every three hours. To calculate K-index, it is critical to get the Quiet Day Curve\ud(QDC). For QDC calculation, we take the previous one month’s average of H-component. In this paper, we compared four\udgeomagnetic stations’ magnetic field data over South Korea and Japan and K-indices of each stations; Bohyun, Gangneung,\udJeju, and Kakioka for two years data, 2011-2012. To investigate the difference depending on the latitude, longitude and local\udtime in more detail, we compare K-index on International Quiet Days (IQDs) and International Disturbed Days (IDDs). As\uda result, we report the correlation between local K-indices are higher than those between Kp and local K-indices, and the\udcorrelation is much better after sunset than after sunrise. As the geomagnetic activity becomes stronger, the correlation\udbetween the local K-indices and global Kp-index become higher

Comparison of K-index Calculations between Several Geomagnetic Stations during IQDs and IDDs