Abstract:
Distribution of the ionospheric irregularities scattering occurrence rate were investigated using data from March, 2018 to November, 2019, which were observed by the SuperDARN Jiamusi and Hokkaido East radars. We statistically compared the irregularities scattering occurrence rate in geomagnetic quiet period (Kp<3) and geomagnetic disturbance period (Kp>3), obtained the variation characteristics of the irregularities scattering occurrence rate depending on magnetic latitude and MLT, and analyzed the characteristics of the occurrence rate enhancement phenomenon in the dusk side and dawn side. The enhancement of the dusk side occurrence rate was widespread in the range of 45°-65ºMLAT, and the occurrence rate in the subauroral region was significantly enhanced during the magnetic disturbed period. The enhancement of the dawn side occurrence rate is mainly distributed in areas below 55ºMLAT, and the enhancement of the geomagnetic disturbance has a weak effect on it except in autumn. The day side occurrence rate in middle magnetic latitude is less affected by geomagnetic disturbance.