Abstract
AbstractIn this paper, we present results of parametric instability induced byX‐mode wave heating observed by EISCAT (European Incoherent Scatter Scientific Association) radar at Tromsø, Norway. Three typicalX‐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 theX‐mode heating period. We suggest that the full dispersion relationship of the Langmuir wave can be employed to analyze theX‐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 ofX‐mode heating wave can also exceed the parametric instability excitation threshold under certain conditions.
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