CEDAR: A Study of the Response of the Low Latitude Thermosphere and Ionosphere to Geomagnetic Storms

CEDAR：低纬度热层和电离层对地磁风暴响应的研究

• 批准号: 9813747
• 负责人: Mihail Codrescu
• 金额: $ 15万
• 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: 1999
• 资助国家: 美国
• 起止时间: 1999-03-15 至 2002-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9813747&HistoricalAwards=false
• 关键词: CEDAR; Study; Response; Low; Latitude

ATM9813747absThe investigators will use a coupled thermosphere-ionosphere-plasmasphere model to study the low latitude thermosphere and ionosphere under quiet and magnetically disturbed conditions. The purpose is to understand the interactions between dynamics, plasma density, and electrodynamics in response to geomagnetic storms. The quiet-time low latitude thermosphere and ionosphere exhibit interesting feedback interactions that give rise to features such as the equatorial ionization anomaly, the pre-reversal enhancement of the eastward electric field, high velocity neutral winds at the magnetic equator, neutral peaks in the post sunset anomaly, and large vertical winds co-located with the temperature features. During a geomagnetic storm, changes in the magnetosphere affect the atmosphere through electric fields that redistribute ionization. This in turn modifies neutral winds and atmospheric composition. The researchers will attempt to simulate these effects using a sophisticated model that couples the thermosphere, ionosphere, and plasmasphere, and they will test the results using ground- and space-based measurements.

ATM9813747abb研究人员将使用热层-电离层-等离子体层耦合模型来研究安静和磁扰动条件下的低纬热层和电离层。其目的是了解动力学、等离子体密度和电动力学之间的相互作用，以响应地磁风暴。平静期低纬热层和电离层表现出有趣的反馈相互作用，产生了赤道电离异常、向东电场逆转前的增强、磁赤道的高速中性风、日落后的中性峰以及与温度特征共存的大垂直风等特征。在地磁风暴期间，磁层的变化通过重新分布电离的电场影响大气。这反过来又改变了中性风和大气成分。研究人员将尝试使用一个复杂的模型来模拟这些影响，该模型耦合了热层、电离层和等离子体层，他们将使用地面和空间测量来测试结果。