基于DPS和GPS的南极中山站电离层TEC比较研究

Based on the observational data of the digital ionosonde DPS - 4D and the GPS - TEC ionospheric scintillation monitor at the Zhongshan Station in Antarctica, a comparative study was carried out on the diurnal and seasonal variation characteristics of the ionospheric total electron content (TEC) obtained by the two in 2013 with respect to solar radiation and geomagnetic activity. The comparison results show that there are obvious polar ionospheric variation characteristics of the ionospheric TEC above the Zhongshan Station in Antarctica. These variation characteristics are generally positively correlated with solar radiation and negatively correlated with geomagnetic activity. Although the variation of the ionospheric TEC has obvious dawn - dusk asymmetry, it can be effectively calculated from the data of the DPS - 4D and the GPS - TEC monitors, and the correlation coefficient between the two reaches 0.86. Combining the position of the polar ionosphere where the Zhongshan Station is located and considering the polar ionospheric convection and the change of neutral atmospheric components under the influence of solar radiation ionization and geomagnetic activity, the reasons for the differences in the TEC results obtained by DPS and GPS were preliminarily analyzed.

基于南极中山站数字式电离层测高仪DPS-4D和GPS-TEC电离层闪烁监测仪的观测数据,比较研究了两者在2013年所得电离层总电子含量(TEC)随太阳辐射和地磁活动的日变化和季节变化特征。比较结果表明,南极中山站上空电离层TEC存在明显的极区电离层变化特性,这种变化特性大体与太阳辐射成正相关关系,而与地磁活动成负相关。尽管电离层TEC变化具有明显的晨昏不对称性,但都能有效地被DPS-4D和GPS TEC监测仪的数据计算获得,且两者相关系数达到0.86。结合中山站所处的极区电离层位置,考虑太阳辐射电离和地磁活动影响下的极区电离层对流以及中性大气成分改变,初步分析了DPS和GPS所得TEC结果有所差异的原因。