CEDAR: Optical Measurements of Daytime Thermospheric Dynamics and Nighttime Mesospheric and Thermospheric Dynamics at the Magnetic Equator

CEDAR：磁赤道白天热层动力学和夜间中层和热层动力学的光学测量

• 批准号: 0228634
• 负责人: John Meriwether
• 金额: $ 31.24万
• 依托单位: Clemson University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-03-01 至 2006-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0228634&HistoricalAwards=false
• 关键词: CEDAR; Optical; Measurements; Daytime; Thermospheric

The investigators will operate a Second-generation Optimized Fabry-Perot Doppler Imager (SOFDI) at the Huancayo Geophysical Observatory in Peru to measure mesospheric and thermospheric winds. The main objective is to determine the way in which zonal wind direction is linked to the occurrence of equatorial spread-F and scintillations at the magnetic equator. A problem in understanding the complex electrodynamics of the equatorial region has been to explain the day-to-day variability of the effects of the disturbed ionosphere, represented by the phenomena of bubbles, scintillations, bottomside spread F, and equatorial spread F. While other factors play a role in these phenomena, the change in the semi-diurnal thermospheric tidal activity that modulates the speed of the zonal wind across the evening twilight terminator may be a key factor. Such variations of the zonal wind speed may affect the timing for the development of the F-region dynamo and modify the likelihood of the development of plasma instabilities. The SOFDI instrument is designed for both nighttime and dayglow measurements of airglow intensities and atmospheric winds and temperatures at remote locations. The observations will be made in coordination with an all-sky imager and the Jicamarca incoherent scatter radar. The investigators will also investigate the possible effects of atmospheric gravity waves on irregularity growth. Irregularities in the equatorial ionosphere produce scintillations that affect the operation of navigation and communications systems. This study will help develop models that can forecast the occurrence of scintillations to protect these systems from deleterious space weather effects.

研究人员将在秘鲁的huancayo地球物理天文台上运营第二代优化的Fabry-Perot多普勒成像仪（SOFDI），以测量中层和热层风。 主要目的是确定区域风向与赤道扩散F和磁赤道处的闪烁相关的方式。 A problem in understanding the complex electrodynamics of the equatorial region has been to explain the day-to-day variability of the effects of the disturbed ionosphere, represented by the phenomena of bubbles, scintillations, bottomside spread F, and equatorial spread F. While other factors play a role in these phenomena, the change in the semi-diurnal thermospheric tidal activity that modulates the speed of the zonal wind across the evening twilight terminator may成为关键因素。 区域风速的这种变化可能会影响F-Region Dynamo开发的时机，并改变血浆不稳定性发展的可能性。 SOFDI仪器设计用于夜间和日光的测量，偏远位置的气流强度以及大气风和温度。 这些观察结果将与全天空成像仪和jicamarca不连贯的散点雷达进行协调。 研究人员还将研究大气重力波对不规则性生长的可能影响。 赤道电离层的不规则性产生影响导航和通信系统运行的闪烁。 这项研究将有助于开发可以预测闪烁发生的模型，以保护这些系统免受有害空间天气影响。