Helioseismology and Solar Magnetic Fields: Studying the Forward Problem

首席研究员（PI）和她的合作者将使用复杂的二维太阳地震学模型来研究太阳的全球内部磁场，以确定选定的振荡模式。然后，他们将确定哪些磁场引起了在太阳周期中观测到的全球太阳模式的频率变化和分裂。研究人员指出，反转日震数据来确定太阳内部的磁场是极其困难的，之前的结果是模糊的，因此，迄今为止对太阳内部磁场的日震研究很少。他们希望他们的方法能够识别出太阳内部的磁场，这些磁场的强度足以产生日震数据的变化，并对目前在标准日震分析过程中所做的假设所带来的误差进行定量估计。PI还断言，这一努力的结果将对太阳内部磁场变化的后果提供更深入的理论理解。研究太阳在磁场影响下的行为将为研究其他恒星的行为提供重要线索。研究太阳磁变率及其原因也可能与地球气候有关，因为太阳辐照度可以影响气候，并随太阳磁周期而变化。该项目将通过Co-PI的职业发展和研究生论文的基础来提供培训。

The Principal Investigator (PI) and her collaborator will study the global internal magnetic fields of the Sun using sophisticated, 2D solar seismology models to identify selected oscillation modes. They will then determine which magnetic fields give rise to the changes in frequency and splitting of global solar modes that are observed over the solar cycle.The investigators note that inverting helioseismic data to determine the magnetic fields inside the Sun is extremely difficult, that prior results have been ambiguous, and that, as a result, there have been very few helioseismic studies of solar internal magnetic fields to date. They expect their methodology to identify the magnetic fields inside the Sun that are strong enough to produce changes in helioseismic data, and to provide a quantitative estimate of the errors introduced by current assumptions made during standard helioseismic analysis. The PI also asserts that the results of this effort will provide a deeper theoretical understanding of the consequences of varying magnetic fields inside the Sun. Investigating how the Sun behaves under the influence of magnetic fields will provide important clues concerning the behavior of other stars. Studying solar magnetic variability and its causes may also be relevant to the Earth's climate, since solar irradiance can affect climate and varies with the solar magnetic cycle. This project will provide training through the career development of the Co-PI and through forming the basis of a graduate student's thesis.