Low Frequency MHD Waves in the Magnetosheath-Magnetopause

这项建议涉及在磁鞘-磁层顶区产生和传播低频MHD波的问题。这是一项关于准垂直弓激波期间磁鞘区域条件的理论研究。将审议四个相互关联的专题：(A)磁鞘中的MHD波活动；(B)场线共振和模转换(在磁层顶向动力Alfven波的转换)；(C)理论预测的波的性质和光谱与在磁鞘和磁层顶中的观测结果的比较；(D)由KAWS驱动的随时间变化的片状重联和输送。设想使用由PI开发的动力学MHD模型，在需要的情况下由数值支持的分析工作，而不是完全的数值模拟。在这个模型中，等离子体是按照冷核成分和热成分来处理的，热成分是用动力学描述的。

This proposal addresses issues pertaining to low-frequency MHD wave generation and propagation in the magnetosheath-magnetopause region. This is a theoretical investigation focused on the conditions in the magnetosheath region during periods of quasi-perpendicular bow shocks. Four interrelated topics will be considered: (a) MHD wave activity in the magnetosheath; (b) field-line resonance and mode conversion (to kinetic Alfven waves (KAWs) at the magnetopause; (c) comparison of theoretically predicted wave properties and spectra with observations in the magnetosheath and mangetopause; (d) time-dependent patchy reconnection and transport driven by KAWs. Analytical work, supported by numerics where needed, rather than full numerical simulations, is envisaged, using a kinetic MHD model developed by the PI. In this model, the plasma is treated in terms of a cold core component and a hot component that is described kinetically.