Space Weather: Improvement of Ionospheric Predictions

空间天气：电离层预测的改进

• 批准号: 9713469
• 负责人: Dieter Bilitza
• 金额: $ 10.44万
• 依托单位: Raytheon Technical Services Company
• 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: 1997-10-01 至 2000-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9713469&HistoricalAwards=false
• 关键词: Space; Weather; Improvement; Ionospheric; Predictions

The investigators improve specification of the topside electron density and ion composition, using the International Reference Ionosphere (IRI) model. Investigating the global and temporal variations of previously determined topside model parameters, they establish a functional description of these variations in terms of universal time, local time, season, solar cycle, magnetic activity and geographic and geomagnetic coordinates. Using incoherent scatter data, they investigate the profile shape near the F peak, an activity necessary in merging the new topside model with F peak models applied in IRI. In addition, they study global and temporal variation patterns of characteristic topside ion composition parameters; like the upper transition height, where ion gas consists to equal parts of light ions and atomic oxygen ions, and the ratio of ionized helium to ionized hydrogen. The ultimate goal of these systematic evaluations is to establish parameters that are most influential in different altitude regimes and the underlying physics.

研究人员使用国际参考电离层（IRI）模型改进了上部电子密度和离子成分的规格。 通过研究先前确定的上部模型参数的全球和时间变化，他们根据世界时、当地时间、季节、太阳周期、磁活动以及地理和地磁坐标建立了这些变化的功能描述。 他们使用不相干散射数据研究 F 峰附近的剖面形状，这是将新的上部模型与 IRI 中应用的 F 峰模型合并所必需的活动。 此外，他们还研究了特征上部离子成分参数的全局和时间变化模式；例如上部跃迁高度，其中离子气体由等量的轻离子和原子氧离子组成，以及电离氦与电离氢的比率。 这些系统评估的最终目标是建立在不同高度范围和基础物理中最有影响力的参数。