Estimating the Earth's Dayside Exospheric Neutral Density Using XMM-Newton Soft X-ray Data

使用 XMM-牛顿软 X 射线数据估算地球白天外层中性密度

• 批准号: 1928883
• 负责人: Dogacan Ozturk
• 金额: $ 48.63万
• 依托单位: University of Alaska Fairbanks Campus
• 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: 2019-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1928883&HistoricalAwards=false
• 关键词: Estimating; Earth; Dayside; Exospheric; Neutral

The very outer edge of the Earth's atmosphere is the exosphere. This study uses X-ray observations from an astrophysics satellite to probe the exosphere and understand how it is impacted by solar activity. The work is relevant to understanding space weather and how it affects satellites, high frequency communications, GPS, and other technological systems relevant to commercial interests and national security - a national priority set out in the National Space Weather Action Plan. The project will support an early-career tenure-track faculty member from an underrepresented group at a minority-serving institution and a graduate student's Ph.D. thesis work. This project is jointly funded by the Magnetospheric Physics program and the Established Program to Stimulate Competitive Research (EPSCoR).This project will investigate solar activity impact on the dayside exospheric density by applying the methodology of Connor & Carter [2019] to the larger XMM-Newton solar wind charge exchange (SWCX) dataset. The project will answer the following three questions: 1) What is an exospheric neutral density at the nominal 10 RE subsolar location, 2) How does the density change during solar minimum, and 3) How does the density change during solar maximum? First, the XMM-Newton dataset will be analyzed to make a list of the strong SWCX events during relatively constant solar wind conditions. Only the stable solar wind conditions will be considered to avoid the complexity of magnetosheath modeling. Then, the PI will select at least 10 strong SWCX events, 5 for solar minimum and 5 for solar maximum, and simulate those events using a global MHD model. They will compare the modeled magnetosheath parameters with contemporary in-situ observations of the heliospheric spacecraft missions such as Cluster, THEMIS, and MMS. After the validation test, they will calculate the magnetosheath contributions from the MHD model and subtract their effect from the SWCX observations. Finally, the exospheric densities will be calculated at 10 RE subsolar location and investigate the density variation between solar minimum and solar maximum.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.

地球大气层的最外缘是外逸层。这项研究利用天体物理卫星的 X 射线观测来探测外逸层并了解太阳活动如何影响它。这项工作涉及了解空间天气及其如何影响卫星、高频通信、GPS 和其他与商业利益和国家安全相关的技术系统——这是《国家空间天气行动计划》中规定的国家优先事项。该项目将支持一名来自少数族裔服务机构中代表性不足群体的早期职业终身教职人员和一名研究生的博士学位。论文工作。该项目由磁层物理计划和刺激竞争研究既定计划 (EPSCoR) 联合资助。该项目将通过将 Connor & Carter [2019] 的方法应用于更大的 XMM-Newton 太阳风电荷交换 (SWCX) 数据集来研究太阳活动对白天外层密度的影响。该项目将回答以下三个问题：1) 标称 10 RE 太阳下位置的外层中性密度是多少，2) 太阳极小期期间密度如何变化，3) 太阳极大期期间密度如何变化？首先，将分析 XMM-Newton 数据集，以列出相对恒定的太阳风条件下的强 SWCX 事件。仅考虑稳定的太阳风条件，以避免磁鞘建模的复杂性。然后，PI 将选择至少 10 个强烈的 SWCX 事件，其中 5 个为太阳极小期事件，5 个为太阳极大期事件，并使用全球 MHD 模型模拟这些事件。他们将把建模的磁鞘参数与当前对日光层航天器任务（例如 Cluster、THEMIS 和 MMS）的现场观测进行比较。验证测试后，他们将计算 MHD 模型的磁鞘贡献，并从 SWCX 观测中减去其影响。最后，将计算 10 RE 太阳下位置的外层密度，并研究太阳极小期和太阳极大期之间的密度变化。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Global Survey of Electron Precipitation due to Hiss Waves in the Earth’s Plasmasphere and Plumes

• DOI: 10.1029/2021ja029644
• 发表时间: 2021-08
• 期刊: Journal of Geophysical Research: Space Physics
• 作者: Q. Ma;Wen Li;X.‐J. Zhang;J. Bortnik;X. Shen;H. Connor;A. Boyd;W. Kurth;G. Hospodarsky;S. Claudepierre;G. Reeves;H. Spence

Isolated Proton Aurora Driven by EMIC Pc1 Wave: PWING, Swarm, and NOAA POES Multi‐Instrument Observations

• DOI: 10.1029/2021gl095090
• 发表时间: 2021-09
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: Hyangpyo Kim;K. Shiokawa;Jaeheung Park;Y. Miyoshi;Y. Miyashita;C. Stolle;H. Connor;J. Hwang;S. Buchert;H. Kwon;Satoko Nakamura;K. Nakamura;S. Oyama;Y. Otsuka;T. Nagatsuma;K. Sakaguchi

Global Survey of Plasma Sheet Electron Precipitation due to Whistler Mode Chorus Waves in Earth's Magnetosphere

• DOI: 10.1029/2020gl088798
• 发表时间: 2020-07
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: Q. Ma;H. Connor;X.‐J. Zhang;W. Li;X. Shen;D. Gillespie;C. Kletzing;W. Kurth;G. Hospodarsky;S. Claudepierre;G. Reeves;H. Spence

Terrestrial exospheric dayside H-density profile at 3–15 <i>R</i>_E from UVIS/HDAC and TWINS Lyman-<i>α</i> data combined

来自 UVIS/HDAC 和 TWINS Lyman-<i>α</i> 数据组合的 3-15-<i>R</i>_E 处的陆地外层日侧 H 密度剖面

• DOI: 10.5194/angeo-40-271-2022
• 发表时间: 2022
• 期刊: Annales Geophysicae
• 影响因子: 1.9
• 作者: Zoennchen, Jochen H.;Connor, Hyunju K.;Jung, Jaewoong;Nass, Uwe;Fahr, Hans J.
• 通讯作者: Fahr, Hans J.

Deriving the Magnetopause Position from the Soft X‐Ray Image by Using the Tangent Fitting Approach

• DOI: 10.1029/2020ja028169
• 发表时间: 2020-08
• 期刊: Journal of Geophysical Research: Space Physics
• 作者: T. Sun;Chi Wang;H. Connor;A. Jorgensen;S. Sembay