Comparison of K-index Calculations between Several Geomagnetic Stations during IQDs and IDDs
BOH magnetometer was installed at Mt. Bohyun in 2007 and has provided continuous dataset for 3-axis geomagnetic field over the South Korea. We have calculated real-time K-index based on BOH magnetic field data using well-known FMI method. Local K-index is calculated eight times a day, per every th...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Korean Space Science Society (KSSS)
2013-09-01
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| Series: | Journal of Astronomy and Space Sciences |
| Subjects: | |
| Online Access: | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2013/v30n3/OJOOBS_2013_v30n3_169.pdf |
| Summary: | BOH magnetometer was installed at Mt. Bohyun in 2007 and has provided continuous dataset for 3-axis geomagnetic field
over the South Korea. We have calculated real-time K-index based on BOH magnetic field data using well-known FMI method.
Local 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
(QDC). For QDC calculation, we take the previous one month’s average of H-component. In this paper, we compared four
geomagnetic stations’ magnetic field data over South Korea and Japan and K-indices of each stations; Bohyun, Gangneung,
Jeju, and Kakioka for two years data, 2011-2012. To investigate the difference depending on the latitude, longitude and local
time in more detail, we compare K-index on International Quiet Days (IQDs) and International Disturbed Days (IDDs). As
a result, we report the correlation between local K-indices are higher than those between Kp and local K-indices, and the
correlation is much better after sunset than after sunrise. As the geomagnetic activity becomes stronger, the correlation
between the local K-indices and global Kp-index become higher. |
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| ISSN: | 2093-5587 2093-1409 |