To monitor changes of space weather, Korea Meteorological Administration (KMA) is observing changes in solar activities and the Earth's magnetic field. Typical solar activities that affect space weather are solar flares and coronal mass ejections. The monitoring of solar activities are conducted mostly by space satellite observation. The main satellites to observe solar flares are GOES-13 and GOES-15. The main satellites to observe coronal mass ejections are STEREO-A, STEREO-B, and SOHO. The ACE satellite observes solar wind and interplanetary magnetic field in order to monitor changes in solar wind caused by coronal mass ejections and high speed solar wind. The observation of changes in the Earth's magnetic field requires both satellite observation and ground magnetic field observation. KMA uses data from GOES-13 and GOES-15 to monitor changes in geostationary orbits. As to changes in ground magnetic field, KMA uses Kp Index and Dst Index, the global geomagnetic storm indexes.
