RISE: Using Precision Photometry of Sun-Like Stars to Estimate Long-Term Solar Variability

RISE：利用类日恒星的精密光度测量来估计长期太阳变化

• 批准号: 9313667
• 负责人: G. Wesley Lockwood
• 金额: --
• 依托单位: Lowell Observatory
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-04-01 至 1998-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9313667&HistoricalAwards=false
• 关键词: RISE; Using; Precision; Photometry; Sun

Nine years' observations of 33 sunlike stars offer tantalizing evidence that the sun's potential for long-term brightness variability is significantly understate by measurements of solar irradiance variations since 1978. These stellar observations also show that changes in visual brightness and magnetic activity are not simply correlated, as has been presumed in reconstructions of long-term solar irradiance fluctuations from sunspot and other solar data. This project will extend the observational time series for three years (that is, comparable with one full "solar" cycle), providing a unique unbroken set of precision photometric measurements at 472 nm and 551 nm. In close collaboration with the separately funded HK program at Mount Wilson Observatory that monitors the chromospheric (magnetic) activity of these stars, the PI will compare magnetic and brightness variations of the sun and similar stars in an effort to characterize long-term solar variability. Stellar and solar brightness variations are clearly linked to chromospheric activity, but the relationship is complex and requires further elucidation. The PI will establish the morphology and statistics of long-term brightness variability with particular regard to the question of poorly understood phenomena such as the solar "Maunder minimum." #

对33颗类日恒星的9年观测提供了诱人的证据，表明自1978年以来对太阳辐照度变化的测量大大低估了太阳长期亮度变化的潜力。这些恒星观测还表明，视觉亮度和磁场活动的变化并不是简单地相关的，就像根据太阳黑子和其他太阳数据重建长期太阳辐照度波动所假设的那样。该项目将把观测时间序列延长三年（即相当于一个完整的“太阳”周期），提供一套独特的、不间断的472 nm和551 nm精密光度测量。在与威尔逊山天文台的独立资助的香港计划密切合作，监测这些恒星的色球（磁）活动，PI将比较太阳和类似恒星的磁场和亮度变化，以努力描述太阳的长期变化。恒星和太阳亮度的变化显然与色球活动有关，但这种关系很复杂，需要进一步阐明。PI将建立长期亮度变化的形态学和统计学，特别是对太阳“蒙德极小期”等知之甚少的现象的问题。" #