[PEM09-P14] The statistical study of the growth rates of Medium-Scale Traveling Ionospheric Disturbances observed with GPS-TEC
Keywords:MSTID, GPS-TEC, Ionosphere
We statistically investigated the growth rate of nighttime-MSTID in Japan in 2014 observed with GPS-TEC. The growth rate of nighttime -MSTID observed was 1.0 - 6.0 × 10-4 s-1 during 1800LT-2400LT in summer.Linear growth rate of Perkins instability in summer was 1.0 - 6.0 × 10-4 s-1 during 1800LT - 2400LT, so they were less than one of the E-F coupling instability. Also,Seasonal distribution of observed growth rate before midnight was similar to that of linear growth rate.U×B derived by GAIA model was high in spring - summer and seasonal distribution of U×B was similar to that of linear growth rate. Therefore, the growth of MSTID when propagating is not determined by E-F coupling instability but Perkins instability and neutral wind.