木星电子回旋谐波驱动的漫射极光发射

IF 2.6 2区 地球科学 Q2 ASTRONOMY & ASTROPHYSICS
Arvind K. Tripathi, Rajendra P. Singhal, Ashish K. Mishra
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引用次数: 0

摘要

在本研究中,我们利用 "联合 "号轨道器最近的观测结果,对木星的漫射极光辐射进行了建模。电子-回旋谐波(ECH)的共振波-粒子相互作用被认为是弥漫极光的产生机制。被困在封闭场线上的高能电子通过俯仰角扩散进入损耗锥。电子析出通量已经计算出来。进入大气层的电子与大气成分原子 H 和分子 H2 发生碰撞,产生电磁辐射。我们考虑了四种激发。它们是原子 H 激发产生的 HLy-α、分子 H2 的离解激发产生的 HLy-α、H2 的莱曼带和沃纳带。计算了这些激发的体积激发率。根据高度积分体积激发率得出极光强度。在五个 L 壳(L = 10、12、15、18 和 20)下进行了数值计算。L = 10 时极光强度最大。在较高的 L = 20 时,强度值降至最低。计算了 H 的 HLy-α、H2 的 HLy-α、H2 的莱曼和韦纳波段的瑞利(R)强度。将这些强度与在土星观测到的漫射极光强度进行比较,发现木星的强度高于土星的预测值。我们还计算了产生 H+ 的原子 H 的体积电离率、产生 H+ 的 H2 的离解电离率以及产生 H2+ 的 H2 的电离率。通过对连续性方程的求解,我们得到了电子密度结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Diffuse Auroral Emissions Driven by Electron Cyclotron Harmonic Waves at Jupiter

In the present work we have modeled diffuse auroral emissions in Jupiter using the recent observations received by JUNO orbiter. Resonant wave-particle interaction by electron-cyclotron harmonic (ECH) waves has been invoked as the mechanism for production of diffuse aurora. Energetic electrons trapped on closed field lines are diffused into the loss-cone via pitch-angle diffusion. Electron precipitation fluxes have been calculated. Electrons entering into the atmosphere undergo collisions with atmospheric constituents atomic H and molecular H2 producing electromagnetic emissions. Four excitations have been considered. These excitations are: HLy-α from excitation of atomic H, HLy-α from dissociative excitation of molecular H2, Lyman and Werner bands of H2. Volume excitation rates have been calculated for these excitations. Height integrated volume excitation rates have been obtained to give auroral intensities. Numerical calculations have been performed at five L-shells; L = 10, 12, 15, 18 and 20. Maximum auroral intensities is obtained at shell L = 10. At higher shell L = 20 the intensity value reduces to a minimum. The intensities in Rayleigh (R) for HLy-α from H, HLy-α from H2, Lyman and Werner bands of H2 are calculated. Comparing these intensities with the diffuse auroral intensities observed at Saturn, it is found that the intensities at Jupiter are higher than the values predicted for Saturn. We have also calculated volume ionization rates for atomic H producing H+, dissociative ionization of H2 producing H+, and ionization of H2 producing H2+. The continuity equation is solved to obtain the electron density Outcomes are discussed.

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来源期刊
Journal of Geophysical Research: Space Physics
Journal of Geophysical Research: Space Physics Earth and Planetary Sciences-Geophysics
CiteScore
5.30
自引率
35.70%
发文量
570
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