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Empirical constraints on O(5+) outflows and velocity distributions in a solar-minimum coronal streamer.

机译:对太阳最小日冕流光O(5+)流出和速度分布的经验约束。

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摘要

The three dimensional distribution of the electron density in the solar minimum corona from 2.4 to 6.0 R⊙ is determined via the robust, regularized, positive estimation (RRPE) tomography method applied to a time series of polarized white-light images taken by the Large Angle and Spectrometric Coronagraph Experiment (LASCO). The LASCO images are supported by inter-comparisons with the Ultraviolet Coronagraph Spectrometer White Light Channel (UVCS/WLC) and in-flight calibration of the UVCS/WLC.; As part of an effort to understand how the solar wind is energized, the so-determined electron density is used to interpret O VI lambda1032, 1037 A spectra taken with UVCS. The spectra are interpreted in terms of empirical constraints on the O5+ ion velocity distributions and outflow speeds. Four conclusions result from this work: (1) our analysis shows O5+ velocity distribution anisotropy in the streamer legs and stalk and also shows that the microscopic velocity distribution (which excludes wave motions that equally affect all charged particles) is anisotropic, where the most probable speed perpendicular to the magnetic field direction exceeds that in the parallel direction; (2) there is preferential heating of the O5+ ions over the protons in the streamer stalk and legs; (3) there is no evidence for preferential O5+ heating in the core; (4) the outflow velocity of the O5+ ions is determined at heights above 4.6 R⊙ . All results have a confidence level of at least 70%.
机译:太阳最小日冕中电子密度的三维分布范围为2.4至6.0 R⊙通过适用于大角度和光谱日冕仪实验(LASCO)拍摄的偏振白光图像的时间序列的鲁棒,正则化,正估计(RRPE)层析成像方法来确定。 LASCO图像得到了与紫外线电晕光谱仪白光通道(UVCS / WLC)的相互比较以及UVCS / WLC的飞行中校准的支持。为了理解如何为太阳风提供能量,使用了确定的电子密度来解释由UVCS拍摄的O VI lambda1032,1037 A光谱。根据对O5 +离子速度分布和流出速度的经验约束来解释光谱。这项工作得出了四个结论:(1)我们的分析显示出拖缆腿和茎中O5 +的速度分布各向异性,并且还表明微观速度分布(不包括对所有带电粒子均等影响的波动)是各向异性的,其中最可能垂直于磁场方向的速度超过平行方向的速度; (2)相比于彩带茎和腿中的质子,O5 +离子优先受热; (3)没有证据表明堆芯中优先进行O5 +加热; (4)在高于4.6 R&odot的高度确定O5 +离子的流出速度; 。所有结果的置信度至少为70%。

著录项

  • 作者

    Frazin, Richard Alan.;

  • 作者单位

    University of Illinois at Urbana-Champaign.;

  • 授予单位 University of Illinois at Urbana-Champaign.;
  • 学科 Physics Astronomy and Astrophysics.
  • 学位 Ph.D.
  • 年度 2002
  • 页码 199 p.
  • 总页数 199
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 天文学;
  • 关键词

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