Numerical Simulation Of Abnormal Incoherent Scatter Spectra Based On Zakharov Model

When high power electromagnetic waves with frequencies near the peak plasma frequency are transmitted into the ionosphere, the parametric decay instability will be stimu-lated around the reflection altitude, which will excite Langmuir turbulence and enhance incoherent scatter spectra later. According to typical parameters of ionospheric modify-cation facilities at Tromso, the incoherent scatter spectra at F region altitudes are simulated based on Zakharov model. With parameters changed, the effects of effective radiated power and heating frequency on spectra are discussed and the character-istics of spectra are analyzed. It turns out that the right shoulder of the ion lines at lower altitudes is enhanced significantly while the left shoulder is increased markedly at higher altitudes and the parametric decay instability is verified to be stimulated in simulation.