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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >A model for accelerated density enhancements emerging from coronal streamers in Large-Angle and Spectrometric Coronagraph observations
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A model for accelerated density enhancements emerging from coronal streamers in Large-Angle and Spectrometric Coronagraph observations

机译：在大角度和光谱日冕仪观测中从日冕带产生的加速密度增强的模型

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摘要

Recent Large-Angle and Spectrometric Coronagraph (LASCO) white light observations, ranging between 2 R-S and 32 R-S, trace accelerated density enhancements in the vicinity of the Sun which can be detected as enhancement in the intensity of the Thomson scattered light. One interpretation of these observed density enhancements is that they indicate moving plasmoids in the corona. Such plasmoids are accelerated away from the Sun by a Lorentz force due to the radial solar magnetic field. A model of accelerated plasmoids is presented which includes this magnetic acceleration, the Sun's gravitational attraction, and the aerodynamic drag acting on the plasmoid as it interacts with the solar wind. With reasonable choices of physical parameters the model produces velocity-height profiles close to the observed ones. Profiles for external initial Alfven velocities nu(Ae0) = 80, 350, and 450 km/s (external initial magnetic field B-e0 = 0.04, 0.16, and 0.21 Gauss) at r(0) = 5 R-S approximately match the lower, the middle, and the upper range of the observed velocity profiles, respectively. Choices for the ratio of the initial plasmoid number density nio and the initial solar wind number density n(e0) of 2 < n(i0)(e0) < 12 guarantee a slowly decreasing relative intensity enhancement in the range of observations. Only moderate line of sight intensity enhancements can be caused by a small and dense plasmoid. [References: 18]
机译：最近的大角度和光谱日冕仪（LASCO）白光观测值介于2 R-S和32 R-S之间，跟踪了太阳附近的加速密度增强，可以将其检测为汤姆森散射光强度的增强。对这些观察到的密度增强的一种解释是，它们表明电晕中正在运动的等离子体。由于径向太阳磁场，洛伦兹力将此类类质体加速远离太阳。提出了加速等离子体的模型，该模型包括磁加速，太阳的引力以及当等离子体与太阳风相互作用时作用在等离子体上的气动阻力。在合理选择物理参数的情况下，模型会产生接近观测值的速度-高度曲线。在r（0）= 5 RS时，外部初始Alfven速度nu（Ae0）= 80、350和450 km / s（外部初始磁场B-e0 = 0.04、0.16和0.21 Gauss）的曲线大致与较低的曲线匹配，分别观察到的速度分布的中间和较高范围。初始质体数密度nio和初始太阳风数密度n（e0）的比率选择为2

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