CEDAR/GEM Postdoc: Assess the Impact of Non-Hydrostatic Processes on the Response of the Thermosphere/Ionosphere System to Magnetospheric Forcing

CEDAR/GEM 博士后：评估非静水过程对热层/电离层系统对磁层强迫响应的影响

• 批准号: 0823689
• 负责人: Timothy Fuller-Rowell
• 金额: $ 17.06万
• 依托单位: University of Colorado at Boulder
• 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 2010-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0823689&HistoricalAwards=false
• 关键词: CEDAR; GEM; Postdoc; Assess; Impact

This project will perform a series of investigations to assess the impact of non-hydrostatic processes on the response of the thermosphere/ionosphere system to magnetospheric forcing. Several General Circulation Models (GCMs) will be involved, including the Global Ionosphere-Thermosphere Model (GITM) and the Coupled Thermosphere Ionosphere Plasmasphere model (CTIP) along with data sets from Fabry-Perot interferometers (FPI) and from the CHAMP and GRACE satellites to characterize the non-hydrostatic processes and its impacts on the neutral density variation, and to model these effects in fully coupled global ionosphere-thermosphere circulation models. The specific investigations to be performed are: (1) Examine the magnetospheric energy input uncertainty related to the variability of the electric field, using the Geospace General Circulation Model (GGCM) for the magnetosphere. The relative importance of the electric field variability to the average electric field and its dependence on the level of solar activity, geomagnetic activity, and season will be examined; (2) Compare the non-hydrostatic GITM model with the hydrostatic CTIP model to quantify the significance of non-hydrostatic processes in driving both the neutral and ion distributions; (3) Investigate the dependence of the non-hydrostatic phenomena on the spatial resolution of GCMs and the temporal variation of the energy inputs. Examining the dependence of the non-hydrostatic processes on both the magnitude and the speed of energy inputs in the thermosphere/ionosphere system will elucidate the critical conditions for significant non-hydrostatic phenomena; (4) Use the simulations and the FPI vertical wind observations to confirm the importance of the nonhydrostatic processes on the development of large vertical winds; (5) Compare the simulations with neutral density data from CHAMP and GRACE satellites to understand the large neutral density disturbance in response to the intense electromagnetic energy inputs. The cusp region neutral density enhancement is observed by the CHAMP satellite. The satellite data will be compared with both GITM and CTIP simulations to examine the importance of the non-hydrostatic processes on the neutral density; (6) Examine the impact of non-hydrostatic processes on atmospheric composition and the nitric oxide distribution. Of particular interest is the possible transport of nitric oxide from the upper to the lower atmosphere due to the change of the atmospheric vortices.

该项目将进行一系列调查，以评估非流体静力过程对热层/电离层系统对磁层作用力的反应的影响。 将涉及几个大气环流模型，包括全球电离层-热层模型和耦合热层电离层等离子体模型，沿着来自法布里-珀罗干涉仪和CHAMP和GRACE卫星的数据集，以描述非流体静力过程及其对中性密度变化的影响，并在完全耦合的全球电离层-热层环流模型中模拟这些影响。 将进行的具体调查是：（1）利用磁层地球空间环流模型，研究与电场变化有关的磁层能量输入不确定性。（2）比较非静力GITM模式和静力CTIP模式，定量分析非静力过程对中性粒子和离子分布的驱动作用;（3）研究非静力现象对大气环流模式空间分辨率和能量输入时间变化的依赖性。研究热层/电离层系统中非静力过程对能量输入的大小和速度的依赖关系，将阐明显著的非静力现象的临界条件：（4）利用模拟和FPI垂直风观测，证实非静力过程对大垂直风发展的重要性;（5）将模拟结果与CHAMP和GRACE卫星的中性密度观测数据进行比较，以了解强电磁能量输入对中性密度扰动的影响。由CHAMP卫星观测到尖点区域中性密度增强。将卫星数据与GITM和CTIP模拟进行比较，以研究非静力过程对中性密度的重要性;（6）研究非静力过程对大气成分和一氧化氮分布的影响。特别令人感兴趣的是，由于大气涡旋的变化，一氧化氮可能从高层大气输送到低层大气。