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首页> 外文学位 >Solar wind iron charge states as identifiers of coronal mass ejections and the characterization of a new low energy particle detector.
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Solar wind iron charge states as identifiers of coronal mass ejections and the characterization of a new low energy particle detector.

机译：太阳风铁的电荷状态可以作为日冕物质抛射的标识符，并且可以表征新型的低能粒子探测器。

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摘要

We examine Fe charge state distributions in the solar wind. The ionic composition of the solar wind directly reflects corona conditions within 4--5 solar radii. Charge state information can be used to determine coronal electron temperatures of source region plasma. Examination of the Fe charge states obtained by the Solar Wind Ion Composition Spectrometer (SWICS) on the Advanced Composition Explorer (ACE), shows a high correlation of the abundance ratio of Fe≥16+/FeTot > 10% with interplanetary coronal mass ejections (ICMEs) observed at 1 A.U. We designate these as "hot ICMEs" due to their associated high charge states. We use the abundance ratio to develop a threshold average Fe charge state, Q>threshold , applicable to charge state data from other spacecraft unable to determine charge state abundances. Applying the Q>threshold to in-ecliptic data from ACE and data from Ulysses along its polar orbit, we identify hot ICMEs as a function of latitude. We find a factor of four fewer hot ICMEs at high latitude than in the ecliptic. After studying features on the Sun near the time of the ICME eruption, we determine that solar flares are likely the source of the observed high Fe charge states. This result has important implications in understanding the relationship between solar flares and CMEs. For years, a controversy has existed over the causal relationship between flares and CMEs. Now, through the work of this thesis, compositional data provides convincing evidence of an association of flares and CMEs.; In addition, we also characterize a new delta-doped charge-coupled device (CCD). The new delta-doped CCD has a dead layer that is ∼1/10 th the thickness of previous SSDs used in ACE/SWIGS. Using this detector, we are able to detect H+ and N+ ions with energies ranging from 1--10 keV in the laboratory. This is a remarkable increase in sensitivity for solid-state particle detectors which currently can only detect particles with energies >30 keV. Application of this detector in future space missions will reduce the previous need for heavy post-acceleration power supplies to accelerate particles above the ∼30 keV threshold and high voltage shielding.
机译：我们研究了太阳风中的铁电荷状态分布。太阳风的离子成分直接反映了太阳辐射4--5范围内的电晕条件。电荷状态信息可用于确定源区等离子体的日冕电子温度。在高级成分浏览器（ACE）上通过太阳风离子成分谱仪（SWICS）获得的铁电荷状态的检验显示，Fe≥16+ / FeTot> 10％的丰度比与行星际冠状物质抛射高度相关（在1 AU观察到的ICME）由于它们关联的高电荷状态，我们将它们指定为“热ICME”。我们使用丰度比来开发阈值平均Fe荷电状态 threshold，适用于来自其他无法确定荷电状态丰度的航天器的荷电状态数据。将阈值应用于ACE的黄道内数据和尤利西斯沿其极轨的数据，我们确定热ICMEs是纬度的函数。我们发现高纬度的热ICME比黄道少了四分之一。在研究ICME爆发时附近的太阳特征之后，我们确定太阳耀斑可能是观测到的高Fe电荷态的来源。该结果对理解太阳耀斑与CME之间的关系具有重要意义。多年来，关于耀斑与CME之间的因果关系一直存在争议。现在，通过本文的工作，成分数据提供了耀斑与CME关联的令人信服的证据。此外，我们还描述了一种新型的增量掺杂电荷耦合器件（CCD）。新的Delta掺杂CCD的死层约为ACE / SWIGS中所用SSD厚度的1/10。使用此检测器，我们能够在实验室中以1--10 keV的能量检测H +和N +离子。对于目前只能检测能量> 30 keV的粒子的固态粒子检测器，灵敏度的显着提高。该探测器在未来的太空飞行中的应用将减少以前对重型后加速电源的需求，以加速高于30 keV阈值的粒子和高压屏蔽。

著录项

  • 作者

    Lepri, Susan Therese.;

  • 作者单位

    University of Michigan.;

  • 授予单位 University of Michigan.;
  • 学科 Physics Astronomy and Astrophysics.; Engineering General.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 173 p.
  • 总页数 173
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 天文学;工程基础科学;
  • 关键词

  • 入库时间 2022-08-17 11:44:00

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