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Variations of Jovian aurora induced by changes in solar wind dynamic pressure.

机译：太阳风动压变化引起的木星极光变化。

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摘要

The jovian aurora contains a persistent main oval encircling each magnetic pole, which is associated with the upward field-aligned currents in the corotation enforcement current system. It has been suggested by two recent studies that the brightness of the main oval should become temporarily dimmer ∼ 1 hr after arrival of a shock wave in the solar wind, compressing the magnetosphere abruptly, because the difference between the angular velocity of the plasma in the magnetosphere and the rigid planetary rotational speed becomes smaller. But recent observations at Jupiter and Saturn have reported the opposite: the auroral oval brightens, and moves poleward, after the arrival of a solar wind shock. In this thesis, I will quantitatively include the flywheel effect of the neutral gas in the ionosphere in the coupling current system to explain this discrepancy and show that the corotation enforcement current should reverse and strengthen after a compression, and thereby temporarily cause the main oval to become brighter and move poleward. I will also show the differences between the night side and the day side in steady state and after a compression event by applying two different magnetic field models fitted from observations, and try to qualitatively explain the dawn-dusk asymmetry by introducing a region-1 current system analogous to that at Earth, which arises from the detailed interaction between solar wind and magnetosphere. Generally, I expect the day side sector of the main oval to brighten more than the night side sector, and the dawn sector to brighten more than the dusk sector.
机译：极光极光包含一个环绕每个磁极的持久主椭圆，它与同向旋转强制电流系统中的向上磁场对准的电流相关联。最近的两项研究表明，在太阳风中冲击波到达后，主椭圆的亮度应暂时变暗〜1小时，从而突然压缩磁层，这是因为等离子体中等离子体的角速度之差磁层和刚性行星旋转速度变小。但是，最近在木星和土星上的观测报告了相反的情况：在太阳风冲击到来之后，极光椭圆变亮，并向极极移动。在本文中，我将定量地包括耦合电流系统中电离层中性气体的飞轮效应，以解释这种差异，并表明同向强制电流在压缩后应反向并增强，从而暂时使主椭圆形变亮并向极点移动。我还将通过应用两个根据观测拟合的不同磁场模型，来展示稳态和压缩事件之后夜间与白天之间的差异，并尝试通过引入1区电流定性解释黎明-黄昏不对称性与地球类似的系统，是由太阳风和磁层之间的详细相互作用产生的。通常，我希望主椭圆形的白天部分比夜间部分更亮，黎明部分比黄昏部分更亮。

著录项

  • 作者

    Gong, Bin.;

  • 作者单位

    Rice University.;

  • 授予单位 Rice University.;
  • 学科 Physics Astronomy and Astrophysics.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 44 p.
  • 总页数 44
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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