Global Modeling of Plasma Plumes in the Equatorial Upper Atmosphere

赤道上层大气中等离子体羽流的全球模拟

• 批准号: 1931415
• 负责人: Joseph Huba
• 金额: $ 15.85万
• 依托单位: SYNTEK TECHNOLOGIES INC.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-12-01 至 2023-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1931415&HistoricalAwards=false
• 关键词: Global; Modeling; Plasma; Plumes; Equatorial

The ionized portion of the equatorial upper atmosphere exhibits significant variability from one day to the next. One important source of this day-to-day variability are plumes of plasma that contain complex - and poorly understood - internal structure that is collectively known as equatorial spread F (ESF). ESF is a complex phenomenon that involves a wide range of scales from equatorial plasma bubbles of tens of km in size to meter-scale irregularities in the plasma density. Recent results using ESF observations and numerical simulations suggested that ESF is difficult to predict by considering condition of the plasma (ionosphere) alone and that one reason may be different conditions in the neutral gas (thermosphere). In addition, vertical coupling between different altitudinal layers can be important in formation of plasma structures at various scales, and it has been previously suggested that metallic ions associated with meteoric deposition may be indirectly responsible for ESF. The goal of this research is to study thermospheric dynamics and metallic ions as possible causes of ESF. The global ionospheric model SAMI3 (Sami3 is Also a Model of the Ionosphere) will be further developed and complemented by a variety of models of thermospheric dynamics. The work will involve (1) study of day-to-day variability of ESF by running the high-resolution version of SAMI3 for different thermospheric conditions as given by a variety of thermosphere models, (2) SAMI3 simulations of the effect of metallic ions (Fe+ and Mg+) on the onset and evolution of ESF through changing conductivity in the post-sunset ionosphere, and (3) further improvements in SAMI3 including implementing the 4th order partial donor cell transport scheme and the nested grid technique to achieve sufficiently high resolution without being computationally prohibitive.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

赤道高层大气的电离部分从一天到下一天表现出显着的变化。这种日复一日的变化的一个重要来源是等离子体羽流，其中包含复杂的内部结构，这些结构被统称为赤道扩展F（ESF）。ESF是一种复杂的现象，涉及范围很广，从数十公里大小的赤道等离子体气泡到等离子体密度的米级不规则性。最近使用ESF观测和数值模拟的结果表明，ESF很难通过单独考虑等离子体（电离层）的条件来预测，其中一个原因可能是中性气体（热层）的不同条件。此外，不同高度层之间的垂直耦合可以是重要的等离子体结构的形成在各种尺度上，它以前已经提出，与流星沉积相关的金属离子可能是间接负责ESF。本研究的目的是研究热层动力学和金属离子作为ESF的可能原因。全球电离层模型SAMI 3（Sami 3也是电离层模型）将得到进一步发展，并由各种热层动力学模型加以补充。这项工作将包括：（1）通过运行SAMI 3的高分辨率版本，针对各种热层模型给出的不同热层条件，研究ESF的逐日变化;（2）SAMI 3模拟金属离子的影响（Fe+和Mg+）通过改变日落后电离层的电导率对ESF的发生和演变的影响，以及（3）进一步改进SAMI 3，包括实施四阶部分施主单元输运方案和嵌套网格技术，以实现足够高的分辨率，而不会在计算上受到限制。该奖项反映了NSF的法定使命，并被认为值得通过使用基金会的知识产权进行评估来支持。优点和更广泛的影响审查标准。

项目成果

Generalized Rayleigh‐Taylor Instability: Ion Inertia, Acceleration Forces, and E Region Drivers

广义瑞利泰勒不稳定性：离子惯性、加速力和 E 区驱动因素

• DOI: 10.1029/2022ja030474
• 发表时间: 2022
• 期刊: Journal of Geophysical Research: Space Physics
• 作者: Huba, J. D.

Modeling the Development of Plasmasphere Ducts and Irregularities With SAMI3/WACCM‐X

使用 SAMI3/WACCM™X 对等离子层管道和不规则性的发展进行建模

• DOI: 10.1029/2023gl105470
• 发表时间: 2023
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: Huba, J. D.;Liu, H. ‐L.
• 通讯作者: Liu, H. ‐L.

Global Modeling of Equatorial Spread F with SAMI3/WACCM‐X

• DOI: 10.1029/2020gl088258
• 发表时间: 2020-07
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: J. Huba;H. Liu

Modeling the Development of an Equatorial Plasma Bubble During a Midnight Temperature Maximum With SAMI3/WACCM‐X

使用 SAMI3/WACCM™X 对午夜最高温度期间赤道等离子体气泡的发展进行建模

• DOI: 10.1029/2023gl104388
• 发表时间: 2023
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: Huba, J. D.;Liu, H. ‐L.;McInerney, J.
• 通讯作者: McInerney, J.

On the Development of the SAMI2 Ionosphere Model

论SAMI2电离层模型的发展

• 发表时间: 2023
• 期刊: Perspectives of earth and space scientists
• 作者: J.D. Huba