标题： 爆发性太阳日珥中的氦谱线 显示英文标题

标题： The Helium spectrum in erupting solar prominences

摘要： 即使处于宁静状态的太阳日珥也可能变得活跃并有时爆发。 这些事件偶尔与日冕物质抛射有关。 然而，我们对激活和爆发过程中等离子体性质的了解非常有限。 我们展示了由爆发日珥发射的氦线的新计算结果。 日珥被建模为一个平面平行的薄板，垂直于太阳表面站立，并作为一个刚体向上移动。 氦谱线是通过非局域热动平衡辐射传递代码计算得出的。 研究了He I和He II共振线在EUV中的多普勒变暗/增亮效应，以及He I 10830 Å和5876 Å线的影响。 我们重点关注线轮廓属性和由此产生的积分强度。 结果表明，氦线对多普勒变暗效应非常敏感。 我们还研究了共振线形成机制中的频率重分布效应，并发现对于共振线必须使用部分频率重分布。 显示英文摘要

摘要： Even quiescent solar prominences may become active and sometimes erupt. These events are occasionally linked to coronal mass ejections. However we know very little about the plasma properties during the activation and eruption processes. We present new computations of the helium line profiles emitted by an eruptive prominence. The prominence is modelled as a plane-parallel slab standing vertically above the solar surface and moving upward as a solid body. The helium spectrum is computed with a non local thermodynamic equilibrium radiative transfer code. The effect of Doppler dimming / brightening is investigated in the resonance lines of He I and He II formed in the EUV, as well as on the He I 10830 A and 5876 A lines. We focus on the line profile properties and the resulting integrated intensities. It is shown that the helium lines are very sensitive to Doppler dimming effects. We also study the effect of frequency redistribution in the formation mechanisms of the resonance lines and find that it is necessary to use partial redistribution in frequency for the resonance lines.