基于陆态网络GNSS数据的2013年和2015年磁暴期间中国地区电离层特性研究

Ionospheric Features over China During the Geomagnetic Storms of 2013 and 2015 Based on CMONOC GNSS Data

摘要:

2013年3月和2015年3月爆发了2次相似的地磁暴，引起了全球不同地区电离层的变化。本文利用中国大陆构造环境监测网络260余个基准站在中国地区的GNSS电离层TEC观测数据，结合电离层测高仪和电离层甚高频相干散射雷达观测，对2次磁暴期间中国地区的电离层变化特性进行了对比分析。结果显示，2013年3月磁暴期间，中国不同地区电离层变化较弱或不明显，而2015年3月磁暴期间中国地区电离层变化整体表现为大范围的强负相暴，中国地区不同程度的电离层响应主要受到不同的磁暴强度和磁暴期间不同的能量输入影响。2次磁暴期间电离层F层不均匀体的发生受到不同程度的影响，可能由不同种类的暴时电场导致。陆态网络数据空间覆盖范围广、时间分辨率高，在研究中国地区磁暴期间的电离层变化特性方面具有优势。

Abstract:

The geomagnetic storms occurred in March 2013 and March 2015 resemble each other in many aspects,and both have caused ionospheric disturbances over different regions of China. Based on GNSS observation data from Crustal Movement Observation Network of China(CMONOC),together with observations from ionosondes and a VHF backscatter radar,the ionospheric features over China during these two geomagnetic storms are analyzed and compared. The ionospheric response due to the March 2013 geomagnetic storm was relatively weak. Whereas during the March 2015 geomagnetic storm,intense negative ionospheric storm was observed. The occurrences of ionospheric F-region field-aligned irregularities were enhanced or suppressed during different stages of the storms,possibly due to the effects of different types of storm-time electric fields. The CMONOC data show advantages in ionospheric research because of the large spatial coverage and high temporal resolution.