ULF wave modulation of the ionospheric parameters: Radar and magnetometer observations

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• 作者：V. Pilipenko ; V. Belakhovsky ; A. Kozlovsky ; E. Fedorov ; K. Kauristie
• 关键词：Ionosphere ; Radar ; Magnetometer ; ULF waves
• 刊名：Journal of Atmospheric and Solar-Terrestrial Physics
• 出版年：February, 2014
• 年：2014
• 卷：108
• 期：Complete
• 页码：68-76
• 全文大小：747 K

文摘

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 Troms酶-Kiruna-Sodankyl盲 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 Troms酶 with the ionospheric parameters shows a significant (up to ) 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.