تقرير
Effect of the Temperature of Background Plasma and the Energy of Energetic Electrons on Z-Mode Excitation
| العنوان: | Effect of the Temperature of Background Plasma and the Energy of Energetic Electrons on Z-Mode Excitation |
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| المؤلفون: | Li, Chuanyang, Chen, Yao, Kong, Xiangliang, Hosseinpour, M., Wang, Bing |
| سنة النشر: | 2019 |
| المجموعة: | Astrophysics Physics (Other) |
| مصطلحات موضوعية: | Astrophysics - Solar and Stellar Astrophysics, Physics - Plasma Physics |
| الوصف: | It has been suggested that the Z-mode instability driven by energetic electrons with a loss-cone type velocity distribution is one candidate process behind the continuum and zebra pattern of solar type-IV radio bursts. Both the temperature of background plasma ($T_0$) and the energy of energetic electrons ($v_e$) are considered to be important to the variation of the maximum growth rate ($\gamma_{max}$). Here we present a detailed parameter study on the effect of $T_0$ and $v_e$, within a regime of the frequency ratio ($10 \leq \frac{\omega_{pe}}{\Omega_{ce}} \leq 30$). In addition to $\gamma_{max}$, we also analyze the effect on the corresponding wave frequency ($\omega^r_{max}$) and propagation angle ($\theta_{max}$). We find that (1) $\gamma_{max}$ in-general decreases with increasing $v_e$, while its variation with $T_0$ is more complex depending on the exact value of $v_e$; (2) with increasing $T_0$ and $v_e$, $\omega^r_{max}$ presents step-wise profiles with jumps separated by gradual or very-weak variations, and due to the warm-plasma effect on the wave dispersion relation $\omega^r_{max}$ can vary within the hybrid band (the harmonic band containing the upper hybrid frequency) and the band higher; (3) the propagation is either perpendicular or quasi-perpendicular, and $\theta_{max}$ presents variations in line with those of $\omega^r_{max}$, as constrained by the resonance condition. We also examine the profiles of $\gamma_{max}$ with $\frac{\omega_{pe}}{\Omega_{ce}}$ for different combinations of $T_0$ and $v_e$ to clarify some earlier calculations which show inconsistent results. |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/1538-4357/ab270f |
| URL الوصول: | http://arxiv.org/abs/1906.01218 |
| رقم الأكسشن: | edsarx.1906.01218 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/1538-4357/ab270f |
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