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Magnetospheric Ducts and Their Role and Importance in Whistler Mode Wave Propagation and Wave-particle Interactions in the Inner Magnetosphere

磁层管道及其在内磁层中惠斯勒模式波传播和波粒相互作用中的作用和重要性

基本信息

批准号：
2015765
负责人：
Vikas Sonwalkar
金额：
$ 56.98万
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：
2020
资助国家：
美国
起止时间：
2020-06-01 至 2025-05-31
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2015765&HistoricalAwards=false
关键词：
Magnetospheric Ducts Their Role Importance

项目摘要

In the geospace environment, large-scale (10-100 km) field-aligned magnetospheric ducts are important to the dynamics and energy transport of the magnetosphere and ionosphere. These regions have irregular density enhancements and depletions that affect the nature of wave-particle interactions. The project studies this process and could lead to improvements of space-based technology, including GPS and satellite communications, and predictive models of space weather. The project supports a graduate student and early career assistant professor.Despite their importance in the physics of the inner magnetosphere, relatively few measurements of magnetic ducts are available because appropriate experimental methods have previously not been developed. Whistler mode (WM) and Z- mode (ZM) sounding from the IMAGE satellite provides a new generation of methods to measure field-aligned electron density and magnetospheric ducts. Using these new methods, the research will investigate magnetospheric ducts and develop a new understanding of the role and importance of ducts in inner magnetospheric processes. The objectives of the project are: (1) to obtain new measurements of duct widths, density enhancements, and occurrence patterns and morphology as a function of geomagnetic and solar activity; (2) to gain new understanding of physical processes that lead to the formation, sustenance, and decay of ducts; and (3) to gain a new understanding of the role of ducts in inner magnetospheric processes. An approach involving data analysis and ray tracing simulations will be used to achieve the objectives described above. The WM and ZM radio sounding and passive measurements from RPI/IMAGE will be the principal source of data used in this research. Results obtained from WM and ZM radio sounding will be augmented and enhanced using complementary wave and particle data available from other ground and space-borne instruments (e.g. ground VLF receivers; satellite wave and particle detectors).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.

在地球空间环境中，大尺度（10-100公里）的场向磁层管道对磁层和电离层的动力学和能量传输非常重要。这些区域具有不规则的密度增强和损耗，影响波粒相互作用的性质。该项目研究这一过程，并可能导致改进天基技术，包括全球定位系统和卫星通信以及空间气象预测模型。该项目支持一名研究生和早期职业助理教授。尽管它们在内磁层物理学中很重要，但由于以前没有开发出适当的实验方法，磁管道的测量相对较少。IMAGE卫星的哨声模式（WM）和Z模式（ZM）探测提供了新一代测量场向电子密度和磁层管道的方法。利用这些新方法，这项研究将调查磁层管道，并对管道在内磁层过程中的作用和重要性有新的认识。该项目的目标是：（1）获得关于管道宽度、密度增加以及作为地磁和太阳活动函数的出现模式和形态的新的测量结果;（2）对导致管道形成、维持和衰减的物理过程有新的认识;（3）对管道在内磁层过程中的作用有新的认识。将使用涉及数据分析和射线跟踪模拟的方法来实现上述目标。RPI/IMAGE的WM和ZM无线电探测和被动测量将是本研究中使用的数据的主要来源。WM和ZM无线电探测获得的结果将使用其他地面和空间仪器（例如地面甚低频接收器;卫星波和粒子探测器）提供的补充波和粒子数据进行扩充和增强。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。