| 초록 |
Using the Total Electron Content (TEC) data from the Global Navigation Service System (GNSS) site in Jeju, operated by the Korea Astronomy and Space Science Institute (geographic location: $33.3^{ circ}N$ , $126.5^{ circ}E$ ; geomagnetic location: $23.6^{ circ}N$ ) for 2002-2014 in Korea, the results of the statistical analysis of positive and negative ionospheric storms are presented for the first time. In this paper, ionospheric storms are defined as turbulences that exceed 50% of the percentage differential Global Positioning System (GPS) TEC ratio ( ${ Delta}TEC$ ) with monthly median GPS TEC. During the period of observations, the total number of positive ionospheric storms ( ${ Delta}TEC$ gt; 50%) was 170, which is greater than five times the number of negative ionospheric storms ( ${ Delta}TEC$ |
