Parametric instability induced by X‐mode wave heating at EISCAT

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• 作者：Xiang Wang ; Chen Zhou ; Moran Liu ; Farideh Honary ; Binbin Ni ; Zhengyu Zhao
• 刊名：Journal of Geophysical Research: Space Physics
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：121
• 期：10
• 页码：10,536-10,548
• 全文大小：2.5MB
• ISSN：2169-9402

文摘

In this paper, we present results of parametric instability induced by X-mode wave heating observed by EISCAT (European Incoherent Scatter Scientific Association) radar at Tromsø, Norway. Three typical X-mode ionospheric heating experiments on 22 October 2013, 19 October 2012, and 21 February 2013 are investigated in details. Both parametric decay instability (PDI) and oscillating two-stream instability are observed during the X-mode heating period. We suggest that the full dispersion relationship of the Langmuir wave can be employed to analyze the X-mode parametric instability excitation. A modified kinetic electron distribution is proposed and analyzed, which is able to satisfy the matching condition of parametric instability excitation. Parallel electric field component of X-mode heating wave can also exceed the parametric instability excitation threshold under certain conditions.