Stellar and Solar Magnetic Activity Cycles

PI将使用洛厄尔天文台的专用光纤馈送光谱仪设施来研究太阳和恒星的磁周期和色球活动。这项研究的目标将(1)辨别产生观测到的太阳和恒星变化的三种效应的性质和相对重要性，即长期活动周期、自转调制和短期随机变化；(2)推断像太阳这样的恒星在其整个生命周期中的周期行为的时间历史，包括关于主要偏离“正常”行为的统计频率的信息；(3)获得对可能的恒星周期的总体的广泛看法，从而洞察恒星动力的性质和恒星磁力对恒星包层辐射输出的影响。

The PIs will study solar and stellar magnetic cycles and chromospheric activity using a dedicated fiber-fed spectrograph facility at Lowell Observatory. The goals of this research will (1) discern the nature and relative importance of three effects which produce observed solar and stellar variability, i.e., the long-term activity cycle, rotational modulation, and short-term stochastic variability; (2) infer the time history of cyclic behavior for a star like the Sun over its entire lifetime, including information about the statistical frequency of major departures from "normal" behavior; (3) obtain a broad perspective on the total ensemble of stellar cycles possible, thus gaining insight into the nature of stellar dynamos and the effect of stellar magnetism on the radiative output from the stellar envelope.