基于佳木斯雷达与北海道东雷达观测的F层不规则体回波发生率

Comparison of Characteristics of F-region Irregularities Scattering Occurrence Rate Based on the Observation of the Jiamusi Radar and Hokkaido East Radar

利用佳木斯和北海道东高频相干散射雷达的观测数据,对2018年3月至2019年11月期间两部雷达观测到的F层高度的不规则体回波信号发生率的分布特征进行了对比分析。比较了在地磁平静期(Kp<3)和地磁扰动期(Kp>3)的不规则体回波发生率变化特征,分析了回波发生率在昏侧与晨侧增强的现象和纬度变化特征。昏侧回波发生率增强现象在45°-64°MLAT范围内普遍存在,其中55°-64°MLAT的回波发生率在地磁扰动期明显增强。而晨侧回波发生率增强现象主要分布在45°-54°MLAT的地区,除了春秋分季外,地磁扰动的增强对其影响较弱。中纬日侧回波发生率受地磁活动影响较小。

Distribution of the ionospheric irregularities scattering occurrence rate was investigated using data from March 2018 to November 2019,which were observed by the SuperDARN Jiamusi and Hokkaido East radars.The irregularities scattering occurrence rate have been statistically compared in the 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°-64°MLAT,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 55°MLAT,and the enhancement of the geomagnetic disturbance has a weak effect on it except in equinox.The dayside occurrence rate in middle magnetic latitude is less affected by geomagnetic disturbance.