Low-Latitude Ionospheric Research at Jicamarca

Jicamarca 的低纬度电离层研究

• 批准号: 9711236
• 负责人: David Hysell
• 金额: $ 12.98万
• 依托单位: Clemson University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-08-15 至 2001-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9711236&HistoricalAwards=false
• 关键词: Low; Latitude; Ionospheric; Research; Jicamarca

This research pertains to theory and observation of equatorial plasma irregularities and equatorial aeronomy. The PI (and one student) will make several sets of short-term observations with the Jicamarca radar, following up with long-term observations using JULIA. Using the PI's coherent scatter radar imaging technique at Jicamarca, the PI will assess and evaluate a number of breaking theories of equatorial F-region plasma irregularities, like why large-scale plasma depletions bifurcate, what coherent scatter Doppler spectra signify, and how shear flow affects the evolution of bottomside spread F waves. The PI will devote another portion of this project to continuing operations of the JULIA radar for E and F region plasma irregularity studies. JULIA data has shown: (1) gradient drift waves in the electrojet are sometimes modulated by tides propagating into the lower thermosphere, (2) evidence of storm-time effects on equatorial electrodynamics and irregularity generation, and (3) F-region irregularities frequency emerge in the early morning, contrary to conventional wisdom. The PI will develop new analytic theories to more precisely account for these phenomena. Finally, he will develop a new mode for incoherent scatter measurements, incorporating an alternating phase-coded pulse for making for sensitive temperature and composition experiment in the topside region.

这项研究属于赤道等离子体不规则性和赤道高层大气学的理论和观测。 PI（和一名学生）将使用Jicamarca雷达进行几组短期观测，然后使用JULIA进行长期观测。 使用PI在Jicamarca的相干散射雷达成像技术，PI将评估和评估赤道F区等离子体不规则性的一些突破理论，例如为什么大规模等离子体耗尽分叉，相干散射多普勒光谱意味着什么，以及剪切流如何影响底侧扩展F波的演变。 PI将把该项目的另一部分用于JULIA雷达在E和F区域等离子体不规则性研究中的持续运行。 JULIA数据显示：（1）电喷流中的梯度漂移波有时会受到传播到低热层的潮汐的调制，（2）风暴时间对赤道电动力学和不规则性产生的影响的证据，以及（3）与传统观点相反，F区不规则性频率出现在清晨。 PI将开发新的分析理论来更精确地解释这些现象。 最后，他将开发一种新的非相干散射测量模式，结合交替相位编码脉冲，用于在顶部区域进行敏感的温度和成分实验。