Modeling the Global Circuit Response to Solar Activity

模拟全球电路对太阳活动的响应

• 批准号: 0242827
• 负责人: Brian Tinsley
• 金额: $ 30.59万
• 依托单位: University of Texas at Dallas
• 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: 2003-08-01 至 2009-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0242827&HistoricalAwards=false
• 关键词: Modeling; Global; Circuit; Response; Solar

The investigators will develop a model of the distribution of current flow in the return path of the global electric circuit. The model will incorporate effects of stratospheric clouds and aerosols, energetic electron precipitation, tropospheric clouds, and atmospheric electricity. The goal is to improve understanding of the global circuit including approximations and influences not treated in existing models. Tropospheric clouds create a high resistance that impedes downward current flow and increases ionospheric potential that increases the current flow in fair weather regions. Stratospheric aerosols reduce ion mobility and increase recombination and resistivity. These similarly increase ionospheric potential and redistribute the current flow into latitude bands where there is a lower concentration of stratospheric aerosols. Polar stratospheric clouds may have the same effect in the locations and at the times they are present. Energetic electron precipitation also modulates the stratospheric resistivity variations. The investigators will model the latitudinal variations of these effects and compare the model output with observations. The work will be valuable for understanding the observations of changes in current flow in response to solar activity. This is important for understanding the role of solar variability in global climate change.

研究人员将开发一个在全球电路返回路径中电流流量分布的模型。 该模型将结合平流层云和气溶胶，能量电子沉淀，对流层云和大气电的影响。 目的是提高对全球电路的理解，包括在现有模型中未经处理的近似值和影响。 对流层云会产生高电阻，从而阻碍向下的电流流动并增加电离层电位，从而增加了天气晴朗区域的电流流量。 平流层气溶胶降低离子迁移率并增加重组和电阻率。 这些类似地增加了电离层电位，并将电流流重新分布到纬度带中，在平流层气溶胶浓度较低的情况下。 极地平流层云在位置和存在的时间可能具有相同的效果。 能量电子沉淀还调节了平流层电阻率的变化。 研究人员将对这些效果的纬度变化进行建模，并将模型输出与观察结果进行比较。 这项工作对于理解响应太阳能活动的当前流动变化的观察将是有价值的。 这对于理解太阳变异性在全球气候变化中的作用很重要。