一种基于GNSS数据的全球电离层不规则结构活动表征方法

针对如何利用GNSS(Global Navigation Satellite System)数据进行电离层扰动监测的问题,提出了一种基于GNSS数据表征全球电离层扰动的方法.利用大约400个GNSS地面站点的观测数据,计算总电子含量(Total Electron Content,TEC)变化率的标准差——ROTI(Ra...

A Characterization Method of Global Ionospheric Irregularities Activities Based on GNSS Data

For the problem of how to use GNSS (Global Navigation Satellite System) data to monitor ionospheric disturbance, this paper proposes a method for characterizing global ionospheric disturbances based on GNSS data. This article uses GNSS (Global Navigation Satellite System) observations of approximately 400 ground stations to calculate the standard deviation of the rate of change of TEC (Total Electron Content)–ROTI (Rate of TEC Index, ROTI), as an ionospheric disturbance observation and projected onto a grid of latitude and longitude to form a 1-hour resolution ROTI map. ROTI maps can reflect ionospheric irregularities ranging from several kilometers to tens of kilometers. The article analyzes the results of ROTI maps when the ionosphere is calm and disturbed during March 2015. And results show that such large-scale irregularities are mainly distributed in high latitude and low latitude regions. During a magnetic storm, ROTI maps show changes in numerical values and disturbance areas. ROTI maps can represent global ionospheric disturbances to a certain extent. On this basis, the index of Global ROTI Disturbance (Global ROTI index, GROTI) is proposed and the analysis results show that GROTI in high regions has a good correlation with the geomagnetic index Kp and AE index.