电离层等离子体泡的磁场扰动特征与识别

等离子体泡是赤道区电离层常见的密度耗空结构,同时伴随着背景磁场的增强和垂直背景磁场方向上的扰动,这些扰动具有阿尔芬波的特征.本文利用Swarm卫星的标量、矢量磁场以及等离子体观测数据,考察了等离子体泡产生的磁场扰动信号特征,发现磁场强度和平均场向分量的增强均与等离子体泡密度下降有较强的负相关性,说明磁场标量和矢量(平均...

Magnetic Signatures and Identification of Equatorial Plasma Bubbles

Equatorial Plasma Bubbles (EPBs) are density depleted structures in the equatorial ionosphere, accompanied by the enhanced magnetic field strength, and fluctuations in the directions transverse to the main field, which have Alfvenic wave signatures. Utilizing the scalar, vector magnetic field, and plasma data from the Swarm mission, the magnetic signatures related with EPB are investigated. It is found that the changes both in the magnetic field strength and the component parallel with the main field are anti-correlated with the density changes inside EPBs, suggesting both the scalar and vector magnetic field data could be used to identify EPSs. Comparing the results of EPB identification using Swarm satellite scalar and vector magnetic field data products respectively, it is confirmed using the scalar data can increase the chance to identify EPBs, especially to find EPBs with relatively lower field fluctuations, since the noise level of the Swarm scalar magnetometer is about one order of magnitude lower than that of the vector magnetometer.