CEDAR: Solar Cyclic and Climatic Trends in Geocoronal Hydrogen

CEDAR：地冕氢的太阳周期和气候趋势

• 批准号: 0836367
• 负责人: Susan Nossal
• 金额: $ 28.3万
• 依托单位: University of Wisconsin-Madison
• 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: 2008-12-01 至 2014-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0836367&HistoricalAwards=false
• 关键词: CEDAR; Solar; Cyclic; Climatic; Trends

The focus of the project is to investigate solar cyclic and climatic trends in geocoronal hydrogen using the Wisconsin long-term mid-latitude geocoronal emission record and the NCAR global mean model. The data have been acquired with two similarly designed ground-based Fabry-Perot Interferometers located in Wisconsin and Arizona. High signal-to-noise observations over solar cycle 23 have quantified a statistically significant solar cyclic influence on the geocoronal hydrogen column emission intensity. Observations from three solar minima (1985, 1997, 2006) agree to within 15% over most of the shadow altitude range. This project will continue the analysis of the Wisconsin northern hemisphere geocoronal data set now spanning three solar cycles to investigate solar cycle influences and to establish additional well-calibrated data sets for long-term comparisons into the future. The project includes an archival study to extend the Wisconsin data set backwards through reanalysis of observations taken in the 1970-80s using updated analysis techniques and the most recent Galactic background information from the Wisconsin H-alpha Mapper Fabry-Perot.A seminal study by Roble and Dickinson [1989] used the NCAR global mean model of the mesosphere, thermosphere, and ionosphere to study the response of the middle and upper atmosphere to a doubling of carbon dioxide and methane. The results showed found an increase of 40-50% in upper thermospheric hydrogen in response to a doubling of methane. Additional studies with global mean model were carried out with historical time-dependent values of CO2 and solar UV fluxes to investigate the thermospheric density response to the solar cycle and to CO2 increases. This project will extend the model studies by adding historical concentrations of methane to the global mean model to investigate the magnitude of predicted solar cyclic and secular changes in thermospheric hydrogen over the 30-year period of the Wisconsin long-term mid-latitude data set. In order to facilitate comparison between these model predictions and the Wisconsin observations, output from the global mean model will be used as input to the LYAO_RT global resonance radiative transfer code to extend the hydrogen density profile into the exosphere and to calculate the corresponding hydrogen column emission intensity.The project goal is to increase understanding of solar-terrestrial interactions, long-term variations, and lower-upper atmospheric coupling. The research would also result in the compilation of an observational dataset with high signal-to-noise ratios for past and future data and model comparisons.

该项目的重点是使用威斯康星州的长期中纬度地球隆发射记录和NCAR全球平均模型研究地球氢氢的太阳环和气候趋势。 数据已使用位于威斯康星州和亚利桑那州的两个类似设计的基于地面的Fabry-Perot干涉仪获得。 太阳周期23中高信噪比的观测值量化了对地理氢柱发射强度的统计学上显着的太阳能环节的影响。 来自三个太阳能Minima（1985，1997，2006）的观察结果在大多数阴影高度范围内同意15％以内。 该项目将继续对威斯康星州北半球的地理核心数据集进行分析，现在跨越了三个太阳周期，以研究太阳周期的影响并建立了其他良好校准的数据集，以长期比较未来。 The project includes an archival study to extend the Wisconsin data set backwards through reanalysis of observations taken in the 1970-80s using updated analysis techniques and the most recent Galactic background information from the Wisconsin H-alpha Mapper Fabry-Perot.A seminal study by Roble and Dickinson [1989] used the NCAR global mean model of the mesosphere, thermosphere, and ionosphere to study the response of the中部和高层大气，二氧化碳和甲烷加倍。 结果表明，由于甲烷增加了一倍，在热层上层氢气中增加了40-50％。 使用二氧化碳和太阳紫外线的历史依赖性值进行了对全球平均模型的其他研究，以研究热圈密度响应对太阳周期的响应和对CO2的增加。 该项目将通过将甲烷的历史浓度添加到全球平均模型中来扩展模型研究，以研究威斯康星州长期中纬度数据集的30年期间，热层氢气中预测的太阳环和世俗变化的幅度。 In order to facilitate comparison between these model predictions and the Wisconsin observations, output from the global mean model will be used as input to the LYAO_RT global resonance radiative transfer code to extend the hydrogen density profile into the exosphere and to calculate the corresponding hydrogen column emission intensity.The project goal is to increase understanding of solar-terrestrial interactions, long-term variations, and lower-upper atmospheric coupling. 这项研究还将导致对过去和将来的数据和模型比较具有高信噪比的观测数据集进行汇编。