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EDP Sciences Astronomy & Astrophysics 699
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    초록·키워드

    We studied the statistical properties of beam-driven upper-hybrid wave turbulence in the solar wind by focusing on the probability density functions (PDFs) of electric field amplitudes, | E |. We used, for the first time, high-resolution and long-term 2D particle-in-cell simulations of the interaction of an electron beam with a magnetized plasma to calculate and analyse the skewness (degree of anisotropy) and the kurtosis (degree of flatness) of the PDFs of | E | and log| E | 2 for various intensities of plasma magnetization (Ω = ω c / ω p ) and average levels of random density fluctuations (Δ N ). Using the Pearson classification, we show that the PDFs of log| E | 2 predominantly align with Type VI Pearson distributions, with a shift towards Type I at high plasma magnetizations. In contrast, the PDFs of | E | are Type I Pearson distributions regardless of the Ω and Δ N values. Comparisons between simulation results and observations by the Solar Orbiter’s Time Domain Sampler instrument show a good agreement. This study also offers a promising method for understanding the dynamics of wave turbulence and indirectly estimating plasma magnetization.

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