Stellar and Solar Magnetic Activity Cycles

PI将使用洛厄尔天文台的专用光纤光谱仪设施研究太阳和恒星的磁周期和色球活动。 本研究的目标是：（1）识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、旋转调制和短期随机变率：（2）推断像太阳这样的星星在其整个生命周期中的周期行为的时间历史，包括关于偏离“正常”行为的主要统计频率的信息;（3）对可能的恒星周期的总系综有一个广阔的视角，从而深入了解恒星发电机的性质以及恒星磁场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.