ULF wave modulation of the ionospheric parameters: Radar and magnetometer observations
ULF wave modulation of the ionospheric parameters: Radar and magnetometer observations
复制标题
电离层参数的 ULF 波调制：雷达和磁力计观测
DOI：
10.1016/j.jastp.2013.12.015
复制
发表时间：
2014
影响因子：
1.9
通讯作者：
K. Kauristie
中科院分区：
文献类型：
--
作者：
V. Pilipenko;V. Belakhovsky;A. Kozlovsky;E. Fedorov;K. Kauristie
利用图像磁强计和EISCAT雷达资料，对2003年10月31日强磁暴恢复期全球Pc5脉动进行了研究。这一雷达设备提供了确定基本电离层参数的垂直剖面及其随时间步调变化的可能性30 S磁力计数据与电离层参数的比较表明，E层的电子密度、高度积分电离层电导和F层的离子温度的Pc5脉动对电离层参数有显著(高达60%)的调制。这种调制是在没有准周期电子沉淀的情况下观察到的，里程计数据证明了这一点。调制效应的机制可能包括超低频电场对焦耳离子的加热和波场定向电流对电离层电子含量的馈电/耗尽。从相图方法可以看出，ULF波对电离层的影响导致了ULF波波形的非线性失真。
The global Pc5 pulsations at the recovery phase of strong magnetic storm on October 31, 2003 are examined using the IMAGE magnetometer and EISCAT radar data from the tri-static Tromsø–Kiruna–Sodankylä system. This radar facility gives possibility to determine the vertical profile of basic ionospheric parameters and their variations with time cadence 30 s. The comparison of magnetometer data from Tromsø with the ionospheric parameters shows a significant (up to~ 60%) modulation by Pc5 pulsations of the electron density in the E-layer, height-integrated ionospheric conductances, and ion temperature in the F-layer. This modulation has been observed in the absence of quasi-periodic electron precipitation as evidenced by riometer data. The mechanisms underlying the modulation effects, probably, comprise the Joule ion heating by ULF wave electric field, and feeding/depleting the ionospheric electron content by the wave field-aligned current. The impact of ULF waves on the ionosphere results in a non-linear distortion of ULF wave form, as revealed by the phase portrait method.