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Updated: Jan 9, 2026

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基于长期AMISR-14观测的本地和非本地午夜后赤道传播F生成的研究
Alexander A Massoud1, Fabiano S Rodrigues1, Jonas Sousasantos1
1The University of Texas at Dallas, William B. Hanson Center for Space Sciences, Richardson, TX 75080 USA.
概括
午夜后的赤道传播F (ESF) 事件显示出强烈的季节性依赖,在6月至日期间达到顶峰. 发生率与太阳流相反,在平静的地磁条件下下降,挑战当地预测方法.
科学领域:
- 空间物理 空间物理
- 离子球物理学 离子球物理学
- 大气科学 大气科学
背景情况:
- 赤道扩散F (ESF) 是一个重要的电离层不规则现象.
- 了解ESF生成机制对于太空天气预测至关重要.
- 之前的研究已经探讨了ESF,但缺乏对午夜后事件及其起源的详细分析.
研究的目的:
- 调查午夜后赤道传播F (ESF) 事件的发生率和产生机制.
- 分析季节性,太阳能和地磁条件对ESF的影响.
- 为了确定ESF活动是否主要是本地或非本地起源.
主要方法:
- 在Jicamarca无线电观测站 (JRO) 使用高级模块化不连贯散射雷达 (AMISR-14) 对396个夜间观测的分析.
- 利用10束AMISR-14模式测量了赤道F区域离子层,区域范围高达400公里.
- 将ESF事件分类为局部 (在雷达视野内) 或非局部 (在视野外).
主要成果:
- 午夜之后的ESF发生率表现出强烈的季节性依赖性,在6月至日期间达到峰值,并在等午期间降至最低.
- 在ESF发生率与太阳流条件有反相关性,在地磁静静的条件下显著下降.
- 在所有分析的条件中,观察到本地和非本地ESF事件的发生率几乎相同.
结论:
- 季节性,太阳能和地磁条件显著影响午夜之后的ESF产生,地磁干扰可能会将下行等离子体漂移逆转为上行漂移,有利于ESF.
- 当地和非本地ESF事件的发生率几乎相同,这表明仅依赖于本地测量的预测模型可能无法完全捕捉ESF现象学.
- 需要进一步的研究来完善预测ESF的模型,同时考虑本地和非本地影响.
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