Theoretical Studies of Solar Flares

这项研究的目的是双重的：了解耀斑脉冲阶段的动力学和能量传输，以及了解耀斑能量的来源。具体地说，目的是：进一步了解耀斑脉冲阶段期间色球中的气体动力学和辐射传输；发展适用于Hα观测的耀斑脉冲阶段能量传输的诊断；确定从矢量磁图中可以和不能了解什么，并研究从这种数据推断无力磁场的方法；研究耀斑前日冕磁场的稳定性和MHD不稳定性在耀斑形成中的作用；研究亚光球流与日冕磁力线足迹的相互作用，以确定FLAIR能量的来源。研究人员将利用气体动力学、辐射传递和磁流体动力学方程的解析和数值技术，从理论上解决这些问题。色球耀斑动力学和无力场方面的工作将有助于解释1991年太阳活动高峰期地面太阳光学望远镜的数据。对耀斑能量产生的研究涉及到与太阳发电机和太阳周期有关的基本问题，并将建议对耀斑机制进行观测测试。

The objectives of this research are twofold: to understand dynamics and energy transport in the impulsive phase of flares, and to understand the origins of flare energy. Specifically, the aim is to: further understand gasdynamics and radiation transfer in the chromosphere during the impulsive phase of flares; develop diagnostics of energy transport in the impulsive phase of flares which are applicable to H alpha observations; ascertain what can and cannot be learned from vector magnetograms and examine methods for the extrapolation of force-free magnetic fields from such data; study the stability of preflare coronal magnetic fields and the role of MHD instabilities in flare initiation; investigate the interaction of sub-photospheric flows with the footprints of coronal magnetic field lines, to determine the source of flair energy. The investigators will attack these problems theoretically, using both analytic and numerical techniques applied to the gasdynamic, radiation transfer, and magnetohydrodynamic equations. The work on chromospheric flare dynamics and force-free fields will assist in interpreting data from ground-based solar optical telescopes during the solar maximum of 1991. Studies of flare energy generation touch on fundamental questions relating to the solar dynamo and the solar cycle, and will suggest observational tests of flare mechanisms.