Space Weather: DE-1 FUV-observed Thermospheric Disturbances and Their Spatial/Temporal Correlation with Negative Ionospheric Storm Data

空间天气：DE-1 FUV 观测的热层扰动及其与负电离层风暴数据的时空相关性

• 批准号: 9819658
• 负责人: Douglas Strickland
• 金额: $ 19.48万
• 依托单位: Computational Physics Inc
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-05-15 至 2002-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9819658&HistoricalAwards=false
• 关键词: Space; Weather; DE; FUV; observed

A three year investigation is proposed to address the evolution of thermospherically disturbed regions produced during geomagnetic storms and their correlation with negative ionospheric storms. The proposal is motivated by the successful outcome of a two year investigation by the PI under a NASA contract to derive thermospheric composition images on the dayside from DE-1 FUV imaging data. The images are in the form of O/N2, the column abundance of O relative to N2 referenced to a fixed depth in the latter species. The work demonstrated that the radiance data can be converted to O/N2 with sufficient accuracy to effectively quantify the structure and intensity of regions of reduced O/N2 (O depletion patches [ODPs]) arising from intense heating at high latitudes during geomagnetic storms. O/N2 images have been produced from various storm-time data showing reductions in O/N2 by more than a factor of two over extended mid-latitude regions. In the current work, the focus will be on first-principles ionospheric modeling to understand the behavior of the observed ionosphere within thermospherically disturbed mid-latitude regions. A key aspect of the modeling will be to reproduce the measure-ments inside and adjacent of O depleted regions within constraints imposed by DE-1-based O/N2. Whereas a key goal of the proposed NASA work will be correlating data with data (DE-based O/N2 with ionospheric measurements), here a key goal will be to better understand the neutral density behavior at E-region heights within O depleted regions through the stated modeling effort. The approach is to attempt to replicate ionospheric observations during O depletion events by modifying the empirical models of neutral densities and winds used in the ionospheric models. That is, an attempt will be made to deduce something about thermospheric structure in O depletion events by working backwards from the observed effects of these events on ionospheric structure. The long range goal is to be able to use satellite images of O/N2 to map out regions likely to be experiencing negative ionospheric storm effects.

提议进行为期三年的调查，以解决地磁风暴期间产生的热层扰动区域的演变及其与负电离层风暴的相关性。 该提案的动机是 PI 根据 NASA 合同进行了为期两年的调查，从 DE-1 FUV 成像数据中获取白天的热层成分图像。 图像采用 O/N2 的形式，即 O 相对于 N2 的柱丰度，参考后一种物种的固定深度。 这项工作表明，辐射数据可以足够准确地转换为 O/N2，以有效量化地磁暴期间高纬度地区强烈加热产生的 O/N2 减少区域（O 消耗斑块 [ODP]）的结构和强度。 O/N2 图像是根据各种风暴时间数据生成的，显示在扩展的中纬度地区 O/N2 减少了两倍以上。 在当前的工作中，重点将放在第一原理电离层建模上，以了解在热层扰动的中纬度地区观测到的电离层的行为。 建模的一个关键方面是在基于 DE-1 的 O/N2 施加的约束内重现 O 耗尽区域内部和邻近区域的测量结果。 虽然 NASA 拟议工作的一个关键目标是将数据与数据关联起来（基于 DE 的 O/N2 与电离层测量），但这里的一个关键目标是通过所述建模工作更好地了解 O 耗尽区域内 E 区域高度的中性密度行为。 该方法是尝试通过修改电离层模型中使用的中性密度和风的经验模型来复制氧气消耗事件期间的电离层观测结果。 也就是说，将尝试通过从观察到的这些事件对电离层结构的影响进行逆推来推断有关耗氧事件中的热层结构的信息。 长期目标是能够使用 O/N2 卫星图像来绘制可能遭受负电离层风暴影响的区域。