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  • Ting Feng, MoRan Liu, ShiMin He, Xiang Wang, Chen Zhou. 2024: Overshoot phenomena: Observation and simulation. Earth and Planetary Physics. DOI: 10.26464/epp2024010
    Citation: Ting Feng, MoRan Liu, ShiMin He, Xiang Wang, Chen Zhou. 2024: Overshoot phenomena: Observation and simulation. Earth and Planetary Physics. DOI: 10.26464/epp2024010
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Overshoot phenomena: Observation and simulation

  • High-powerful O-mode radio waves can excite artificial instabilities in the F-region at the European Incoherent Scatter Science Association (EISCAT) heating facility. The main instabilities include parametric decay instability (PDI), oscillating two-stream instability (OTSI) and thermal parametric instability (TPI). PDI and OTSI not only compete with each other but also compete with the TPI leading to a two-stage overshoot phenomenon: the miniovershoot occurs in the millisecond time scale after the pump-on followed by the main overshoot. We gain insight into the miniovershoot via a generalized Zakharov model, while the main overshoot can be observed as the enhanced plasma line overshoot phenomena in incoherent scatter radar spectra. We can also observe that the zero-frequency ion line only exists in the initial heating period after cold-start and the upshifted and downshifted ion lines behave irregularly in the spectra. The simulation results show that the competition between PDI and OTSI leads to the initial peak which we name pre-miniovershoot. The following processes, ion density cavitons generation, collapse and the cascade in the development of PDI, contribute to the miniovershoot phenomenon.
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