CEDAR Postdoc: The Effect of Atmospheric Tides on the Equatorial and Near-Polar Ionosphere

CEDAR博士后：大气潮汐对赤道和近极电离层的影响

• 批准号: 0823699
• 负责人: Thomas Immel
• 金额: $ 16.86万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0823699&HistoricalAwards=false
• 关键词: CEDAR; Postdoc; Effect; Atmospheric; Tides

This project investigates tidal coupling between the neutral lower atmosphere and the ionosphere at equatorial and near-polar latitudes. The recent discovery that tropospheric tides have a strong effect on the structure of the equatorial ionosphere at altitudes extending up through the F-region motivates this work, and was the basis for the targeted approach to addressing the effects of tidal coupling on the ionosphere that will be undertaken. Analysis of recent ultraviolet (UV) nightglow observations from the TIMED (Thermosphere Ionosphere Mesosphere Energetics and Dynamics) and IMAGE (Imager for Magnetosphere-to-Aurora Global Exploration) satellites demonstrated that there is a correlation between zonal structures seen in the nighttime ionosphere with the atmospheric tides. The coupling mechanism was interaction of tides in the neutral atmosphere with the E-region dynamo, which couples the zonal structure via plasma uplift through F-region altitudes. This project will use a combination of experimental data and simulations to investigate the global nature of tidal effects on the ionosphere, from their apparent origins through the thermosphere. The Constellation Observing System for Meteorology, Ionosphere and Climate and Taiwan's Formosa Satellite Mission #3 (COSMIC/FORMOSAT-3) mission provides over 1500 GPS (Global Positioning System's) radio occultation profiles of electron density from 100 to 450 km altitude every day, as well as profiles of temperature, pressure, and refractivity from near the surface to 60 km altitude with substantial geographic and temporal resolution. The profiles have tight accuracies such that the tidal structures that affect the ionosphere should be clearly evident at ionospheric altitudes; in addition, tidal features consistent with tropospheric forcing may also be detectable in the stratosphere and troposphere. The GPS radio occultation profiles, of electron density, temperature, pressure, and refractivity, are a good resource for comparison with ionospheric and tidal studies using incoherent scatter radar (ISR) measurements of electron density, ion drift velocities and temperatures, and derived neutral winds. ISR measurements from Poker Flat, Millstone Hill, and Jicamarca will be used to allow examination of tidal effects at equatorial, mid, and high northern latitudes with high temporal and local spatial coverage. The observations of tidal structure with altitude, latitude, and season will be compared with simulations from the TIME-GCM/GSWM (Thermosphere Ionosphere Mesosphere Electrodynamics General Circulation Model/Global Scale Wave Model).

该项目研究了赤道​​和近极纬度的中性下部大气层和电离层之间的潮汐耦合。 最近发现，对流层潮汐对通过F区域延伸的赤道电离层的结构具有很强的影响，这激发了这项工作，并且是解决潮汐偶联对电离层的影响的有针对性方法的基础。 分析来自定时（热层电离层中层能量和动力学）和图像（磁层到陶器到龙龙全球勘探的成像仪）的最新紫外线（UV）agi夜观察结果表明，在夜间电离层与大气领域相关的层状结构之间存在相关性。 耦合机制是中性气氛中潮汐与电子区域发电机的相互作用，该潮汐发电机通过血浆通过F-Region高度促成Zonal结构。 该项目将利用实验数据和模拟的组合来研究潮流对电离层的全球性质，从它们的明显起源到热层。 气象学，电离层和气候的星座观察系统以及台湾的福尔摩赛卫星任务＃3（宇宙/福尔摩斯特-3）任务可提供1500多个GPS（全球定位系统）的无线电隐匿性，电子密度的每天100至450 km的电子密度，以及临时的高度，临近的均高度和反射效率，以及临近的高度，反速度和反射效率。 解决。 剖面具有紧密的精度，使影响电离层的潮汐结构应在电离层高度清楚地明显。另外，在平流层和对流层中也可以检测到与对流层强迫一致的潮汐特征。 电子密度，温度，压力和折射率的GPS无线电掩型曲线是与电离层和潮汐研究进行比较的良好资源，该资源是使用不相干的散射雷达（ISR）测量的电子密度，离子漂移速度和温度的测量值，并具有中性风。 扑克平坦，米尔斯通山（Millstone Hill）和吉卡马卡（Jicamarca）的ISR测量将用于检查赤道，中和高北纬度地区的潮汐效应，并具有较高的时间和局部空间覆盖范围。 与Time-GCM/GSWM的模拟（热层电离层中层电动动力学一般循环模型/全球尺度波模型）的模拟将比较具有高度，纬度和季节的潮汐结构的观察结果。